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PYSEC-2023-221
Vulnerability from pysec - Published: 2023-10-25 18:17 - Updated: 2023-11-08 18:38
VLAI
Details
Werkzeug is a comprehensive WSGI web application library. If an upload of a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. This vulnerability has been patched in version 3.0.1.
Severity
7.5 (High)
Impacted products
| Name | purl | werkzeug | pkg:pypi/werkzeug |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "werkzeug",
"purl": "pkg:pypi/werkzeug"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "f3c803b3ade485a45f12b6d6617595350c0f03e2"
},
{
"fixed": "f2300208d5e2a5076cbbb4c2aad71096fd040ef9"
}
],
"repo": "https://github.com/pallets/werkzeug",
"type": "GIT"
},
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.3.8"
},
{
"introduced": "3.0.0"
},
{
"fixed": "3.0.1"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.1",
"0.10",
"0.10.1",
"0.10.2",
"0.10.3",
"0.10.4",
"0.11",
"0.11.1",
"0.11.10",
"0.11.11",
"0.11.12",
"0.11.13",
"0.11.14",
"0.11.15",
"0.11.2",
"0.11.3",
"0.11.4",
"0.11.5",
"0.11.6",
"0.11.7",
"0.11.8",
"0.11.9",
"0.12",
"0.12.1",
"0.12.2",
"0.13",
"0.14",
"0.14.1",
"0.15.0",
"0.15.1",
"0.15.2",
"0.15.3",
"0.15.4",
"0.15.5",
"0.15.6",
"0.16.0",
"0.16.1",
"0.2",
"0.3",
"0.3.1",
"0.4",
"0.4.1",
"0.5",
"0.5.1",
"0.6",
"0.6.1",
"0.6.2",
"0.7",
"0.7.1",
"0.7.2",
"0.8",
"0.8.1",
"0.8.2",
"0.8.3",
"0.9",
"0.9.1",
"0.9.2",
"0.9.3",
"0.9.4",
"0.9.5",
"0.9.6",
"1.0.0",
"1.0.0rc1",
"1.0.1",
"2.0.0",
"2.0.0rc1",
"2.0.0rc2",
"2.0.0rc3",
"2.0.0rc4",
"2.0.0rc5",
"2.0.1",
"2.0.2",
"2.0.3",
"2.1.0",
"2.1.1",
"2.1.2",
"2.2.0",
"2.2.0a1",
"2.2.1",
"2.2.2",
"2.2.3",
"2.3.0",
"2.3.1",
"2.3.2",
"2.3.3",
"2.3.4",
"2.3.5",
"2.3.6",
"2.3.7",
"3.0.0"
]
}
],
"aliases": [
"CVE-2023-46136",
"GHSA-hrfv-mqp8-q5rw"
],
"details": "Werkzeug is a comprehensive WSGI web application library. If an upload of a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer. This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. This vulnerability has been patched in version 3.0.1.",
"id": "PYSEC-2023-221",
"modified": "2023-11-08T18:38:34.170214Z",
"published": "2023-10-25T18:17:00Z",
"references": [
{
"type": "FIX",
"url": "https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2"
},
{
"type": "ADVISORY",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw"
}
],
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
BREW-AWS-SAM-CLI-CVE-202… (GHSA-HRFV-MQP8-Q5RW)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:37 – Updated: 2026-09-17 19:54 – Source website
VLAI
Summary
Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning
Details
Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.
This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.
Severity
5.7 (Medium)
References
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.0.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "aws-sam-cli",
"purl": "pkg:brew/aws-sam-cli"
},
"ranges": [
{
"events": [
{
"introduced": "1.70.0"
},
{
"fixed": "1.99.0_1"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That\u0027s why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.\n\nThis allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.",
"id": "BREW-aws-sam-cli-CVE-2023-46136",
"modified": "2026-09-17T19:54:58Z",
"published": "2026-08-13T16:37:01Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46136"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/b1916c0c083e0be1c9d887ee2f3d696922bfc5c1"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/cbb446fdcada7685fce936ded01b76c08dbd6eb5"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f2300208d5e2a5076cbbb4c2aad71096fd040ef9"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-221.yaml"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20231124-0008"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning",
"upstream": [
"GHSA-hrfv-mqp8-q5rw",
"CVE-2023-46136",
"PYSEC-2023-221"
]
}
BREW-BACKGROUNDREMOVER-C… (GHSA-HRFV-MQP8-Q5RW)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:37 – Updated: 2026-09-09 23:43 – Source website
VLAI
Summary
Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning
Details
Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.
This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.
Severity
5.7 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.0.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "backgroundremover",
"purl": "pkg:brew/backgroundremover"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.4.5"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That\u0027s why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.\n\nThis allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.",
"id": "BREW-backgroundremover-CVE-2023-46136",
"modified": "2026-09-09T23:43:06Z",
"published": "2026-08-13T16:37:03Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46136"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/b1916c0c083e0be1c9d887ee2f3d696922bfc5c1"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/cbb446fdcada7685fce936ded01b76c08dbd6eb5"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f2300208d5e2a5076cbbb4c2aad71096fd040ef9"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-221.yaml"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20231124-0008"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning",
"upstream": [
"GHSA-hrfv-mqp8-q5rw",
"CVE-2023-46136",
"PYSEC-2023-221"
]
}
BREW-BAGELS-CVE-2023-46136 (GHSA-HRFV-MQP8-Q5RW)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:37 – Updated: 2026-09-09 23:43 – Source website
VLAI
Summary
Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning
Details
Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.
This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.
Severity
5.7 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.0.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "bagels",
"purl": "pkg:brew/bagels"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.3.12_14"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That\u0027s why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.\n\nThis allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.",
"id": "BREW-bagels-CVE-2023-46136",
"modified": "2026-09-09T23:43:06Z",
"published": "2026-08-13T16:37:04Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46136"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/b1916c0c083e0be1c9d887ee2f3d696922bfc5c1"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/cbb446fdcada7685fce936ded01b76c08dbd6eb5"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f2300208d5e2a5076cbbb4c2aad71096fd040ef9"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-221.yaml"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20231124-0008"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning",
"upstream": [
"GHSA-hrfv-mqp8-q5rw",
"CVE-2023-46136",
"PYSEC-2023-221"
]
}
BREW-BUKU-CVE-2023-46136 (GHSA-HRFV-MQP8-Q5RW)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:38 – Updated: 2026-09-09 23:45 – Source website
VLAI
Summary
Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning
Details
Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.
This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.
Severity
5.7 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.0.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "buku",
"purl": "pkg:brew/buku"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "5.1_6"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That\u0027s why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.\n\nThis allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.",
"id": "BREW-buku-CVE-2023-46136",
"modified": "2026-09-09T23:45:01Z",
"published": "2026-08-13T16:38:25Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46136"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/b1916c0c083e0be1c9d887ee2f3d696922bfc5c1"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/cbb446fdcada7685fce936ded01b76c08dbd6eb5"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f2300208d5e2a5076cbbb4c2aad71096fd040ef9"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-221.yaml"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20231124-0008"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning",
"upstream": [
"GHSA-hrfv-mqp8-q5rw",
"CVE-2023-46136",
"PYSEC-2023-221"
]
}
BREW-CERTSYNC-CVE-2023-46136 (GHSA-HRFV-MQP8-Q5RW)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:39 – Updated: 2026-09-09 23:45 – Source website
VLAI
Summary
Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning
Details
Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.
This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.
Severity
5.7 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.0.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "certsync",
"purl": "pkg:brew/certsync"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.1.6_11"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That\u0027s why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.\n\nThis allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.",
"id": "BREW-certsync-CVE-2023-46136",
"modified": "2026-09-09T23:45:59Z",
"published": "2026-08-13T16:39:03Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46136"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/b1916c0c083e0be1c9d887ee2f3d696922bfc5c1"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/cbb446fdcada7685fce936ded01b76c08dbd6eb5"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f2300208d5e2a5076cbbb4c2aad71096fd040ef9"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-221.yaml"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20231124-0008"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning",
"upstream": [
"GHSA-hrfv-mqp8-q5rw",
"CVE-2023-46136",
"PYSEC-2023-221"
]
}
BREW-CLOUDFORMATION-CLI-… (GHSA-HRFV-MQP8-Q5RW)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:40 – Updated: 2026-09-09 23:48 – Source website
VLAI
Summary
Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning
Details
Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.
This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.
Severity
5.7 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.0.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "cloudformation-cli",
"purl": "pkg:brew/cloudformation-cli"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.2.39_13"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That\u0027s why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.\n\nThis allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.",
"id": "BREW-cloudformation-cli-CVE-2023-46136",
"modified": "2026-09-09T23:48:13Z",
"published": "2026-08-13T16:40:09Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46136"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/b1916c0c083e0be1c9d887ee2f3d696922bfc5c1"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/cbb446fdcada7685fce936ded01b76c08dbd6eb5"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f2300208d5e2a5076cbbb4c2aad71096fd040ef9"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-221.yaml"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20231124-0008"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning",
"upstream": [
"GHSA-hrfv-mqp8-q5rw",
"CVE-2023-46136",
"PYSEC-2023-221"
]
}
BREW-FAVA-CVE-2023-46136 (GHSA-HRFV-MQP8-Q5RW)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:46 – Updated: 2026-09-09 23:56 – Source website
VLAI
Summary
Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning
Details
Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.
This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.
Severity
5.7 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.0.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "fava",
"purl": "pkg:brew/fava"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.30.14"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That\u0027s why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.\n\nThis allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.",
"id": "BREW-fava-CVE-2023-46136",
"modified": "2026-09-09T23:56:33Z",
"published": "2026-08-13T16:46:31Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46136"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/b1916c0c083e0be1c9d887ee2f3d696922bfc5c1"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/cbb446fdcada7685fce936ded01b76c08dbd6eb5"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f2300208d5e2a5076cbbb4c2aad71096fd040ef9"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-221.yaml"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20231124-0008"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning",
"upstream": [
"GHSA-hrfv-mqp8-q5rw",
"CVE-2023-46136",
"PYSEC-2023-221"
]
}
BREW-FLEXGET-CVE-2023-46136 (GHSA-HRFV-MQP8-Q5RW)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:47 – Updated: 2026-09-09 23:58 – Source website
VLAI
Summary
Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning
Details
Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.
This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.
Severity
5.7 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.0.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "flexget",
"purl": "pkg:brew/flexget"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "3.20.4"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That\u0027s why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.\n\nThis allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.",
"id": "BREW-flexget-CVE-2023-46136",
"modified": "2026-09-09T23:58:04Z",
"published": "2026-08-13T16:47:29Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46136"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/b1916c0c083e0be1c9d887ee2f3d696922bfc5c1"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/cbb446fdcada7685fce936ded01b76c08dbd6eb5"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f2300208d5e2a5076cbbb4c2aad71096fd040ef9"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-221.yaml"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20231124-0008"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning",
"upstream": [
"GHSA-hrfv-mqp8-q5rw",
"CVE-2023-46136",
"PYSEC-2023-221"
]
}
BREW-GDBGUI-CVE-2023-46136 (GHSA-HRFV-MQP8-Q5RW)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:49 – Updated: 2026-09-09 23:59 – Source website
VLAI
Summary
Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning
Details
Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.
This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.
Severity
5.7 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.3",
"upstream_fixed_in": "3.0.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "gdbgui",
"purl": "pkg:brew/gdbgui"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "0.15.3.0"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.3",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.3"
}
]
},
"details": "Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That\u0027s why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.\n\nThis allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.",
"id": "BREW-gdbgui-CVE-2023-46136",
"modified": "2026-09-09T23:59:59Z",
"published": "2026-08-13T16:49:15Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46136"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/b1916c0c083e0be1c9d887ee2f3d696922bfc5c1"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/cbb446fdcada7685fce936ded01b76c08dbd6eb5"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f2300208d5e2a5076cbbb4c2aad71096fd040ef9"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-221.yaml"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20231124-0008"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning",
"upstream": [
"GHSA-hrfv-mqp8-q5rw",
"CVE-2023-46136",
"PYSEC-2023-221"
]
}
BREW-GRIP-CVE-2023-46136 (GHSA-HRFV-MQP8-Q5RW)
Vulnerability from osv_homebrew – Published: 2026-08-13 16:55 – Updated: 2026-09-10 00:06 – Source website
VLAI
Summary
Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning
Details
Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That's why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.
This allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.
Severity
5.7 (Medium)
References
| URL | Type | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
|||||||||||||||||||||||||||||
{
"affected": [
{
"ecosystem_specific": {
"fix": "bump",
"range_state": "fixed",
"resource": "werkzeug",
"resource_purl": "pkg:pypi/werkzeug@3.1.8",
"upstream_fixed_in": "3.0.1"
},
"package": {
"ecosystem": "Homebrew",
"name": "grip",
"purl": "pkg:brew/grip"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.6.2_21"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"database_specific": {
"confidence": "high",
"source": "matched",
"strategy": "registry",
"upstream_evidence": [
{
"ecosystem": "PyPI",
"key": "pkg:pypi/werkzeug@3.1.8",
"name": "werkzeug",
"resource": "werkzeug",
"strategy": "registry",
"subject_version": "3.1.8"
}
]
},
"details": "Werkzeug multipart data parser needs to find a boundary that may be between consecutive chunks. That\u0027s why parsing is based on looking for newline characters. Unfortunately, code looking for partial boundary in the buffer is written inefficiently, so if we upload a file that starts with CR or LF and then is followed by megabytes of data without these characters: all of these bytes are appended chunk by chunk into internal bytearray and lookup for boundary is performed on growing buffer.\n\nThis allows an attacker to cause a denial of service by sending crafted multipart data to an endpoint that will parse it. The amount of CPU time required can block worker processes from handling legitimate requests. The amount of RAM required can trigger an out of memory kill of the process. If many concurrent requests are sent continuously, this can exhaust or kill all available workers.",
"id": "BREW-grip-CVE-2023-46136",
"modified": "2026-09-10T00:06:27Z",
"published": "2026-08-13T16:55:20Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/security/advisories/GHSA-hrfv-mqp8-q5rw"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-46136"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/b1916c0c083e0be1c9d887ee2f3d696922bfc5c1"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/cbb446fdcada7685fce936ded01b76c08dbd6eb5"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f2300208d5e2a5076cbbb4c2aad71096fd040ef9"
},
{
"type": "WEB",
"url": "https://github.com/pallets/werkzeug/commit/f3c803b3ade485a45f12b6d6617595350c0f03e2"
},
{
"type": "PACKAGE",
"url": "https://github.com/pallets/werkzeug"
},
{
"type": "WEB",
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/werkzeug/PYSEC-2023-221.yaml"
},
{
"type": "WEB",
"url": "https://security.netapp.com/advisory/ntap-20231124-0008"
}
],
"schema_version": "1.7.3",
"severity": [
{
"score": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
],
"summary": "Werkzeug DoS: High resource usage when parsing multipart/form-data containing a large part with CR/LF character at the beginning",
"upstream": [
"GHSA-hrfv-mqp8-q5rw",
"CVE-2023-46136",
"PYSEC-2023-221"
]
}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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