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8 vulnerabilities found for cbor2 by agronholm

CVE-2025-68131 (GCVE-0-2025-68131)

Vulnerability from nvd – Published: 2025-12-31 01:15 – Updated: 2026-01-02 14:37
VLAI?
Title
CBORDecoder reuse can leak shareable values across decode calls
Summary
cbor2 provides encoding and decoding for the Concise Binary Object Representation (CBOR) serialization format. Starting in version 3.0.0 and prior to version 5.8.0, whhen a CBORDecoder instance is reused across multiple decode operations, values marked with the shareable tag (28) persist in memory and can be accessed by subsequent CBOR messages using the sharedref tag (29). This allows an attacker-controlled message to read data from previously decoded messages if the decoder is reused across trust boundaries. Version 5.8.0 patches the issue.
Severity ?
5.5 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
CWE
  • CWE-212 - Improper Removal of Sensitive Information Before Storage or Transfer
Assigner
References
Impacted products
Vendor Product Version
agronholm cbor2 Affected: >= 3.0.0, < 5.8.0
Create a notification for this product.
Show details on NVD website
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CVE-2025-64076 (GCVE-0-2025-64076)

Vulnerability from nvd – Published: 2025-11-18 00:00 – Updated: 2025-11-19 13:55
VLAI?
Summary
Multiple vulnerabilities exist in cbor2 through version 5.7.0 in the decode_definite_long_string() function of the C extension decoder (source/decoder.c): (1) Integer Underflow Leading to Out-of-Bounds Read (CWE-191, CWE-125): An incorrect variable reference and missing state reset in the chunk processing loop causes buffer_length to not be reset to zero after UTF-8 character consumption. This results in subsequent chunk_length calculations producing negative values (e.g., chunk_length = 65536 - buffer_length), which are passed as signed integers to the read() method, potentially triggering unlimited read operations and resource exhaustion. (2) Memory Leak via Missing Reference Count Release (CWE-401): The main processing loop fails to release Python object references (Py_DECREF) for chunk objects allocated in each iteration. For CBOR strings longer than 65536 bytes, this causes cumulative memory leaks proportional to the payload size, enabling memory exhaustion attacks through repeated processing of large CBOR payloads. Both vulnerabilities can be exploited remotely without authentication by sending specially-crafted CBOR data containing definite-length text strings with multi-byte UTF-8 characters positioned at 65536-byte chunk boundaries. Successful exploitation results in denial of service through process crashes (CBORDecodeEOF exceptions) or memory exhaustion. The vulnerabilities affect all applications using cbor2's C extension to process untrusted CBOR data, including web APIs, IoT data collectors, and message queue processors. Fixed in commit 851473490281f82d82560b2368284ef33cf6e8f9 pushed with released version 5.7.1.
Severity ?
7.5 (High)
CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N
CWE
  • n/a
Assigner
References
Show details on NVD website
To clipboard 

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CVE-2024-26134 (GCVE-0-2024-26134)

Vulnerability from nvd – Published: 2024-02-19 22:13 – Updated: 2025-02-13 17:41
VLAI?
Title
CBOR2 decoder has potential buffer overflow
Summary
cbor2 provides encoding and decoding for the Concise Binary Object Representation (CBOR) (RFC 8949) serialization format. Starting in version 5.5.1 and prior to version 5.6.2, an attacker can crash a service using cbor2 to parse a CBOR binary by sending a long enough object. Version 5.6.2 contains a patch for this issue.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
Impacted products
Vendor Product Version
agronholm cbor2 Affected: >= 5.5.1, < 5.6.2
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2025-68131 (GCVE-0-2025-68131)

Vulnerability from cvelistv5 – Published: 2025-12-31 01:15 – Updated: 2026-01-02 14:37
VLAI?
Title
CBORDecoder reuse can leak shareable values across decode calls
Summary
cbor2 provides encoding and decoding for the Concise Binary Object Representation (CBOR) serialization format. Starting in version 3.0.0 and prior to version 5.8.0, whhen a CBORDecoder instance is reused across multiple decode operations, values marked with the shareable tag (28) persist in memory and can be accessed by subsequent CBOR messages using the sharedref tag (29). This allows an attacker-controlled message to read data from previously decoded messages if the decoder is reused across trust boundaries. Version 5.8.0 patches the issue.
Severity ?
5.5 (Medium)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
CWE
  • CWE-212 - Improper Removal of Sensitive Information Before Storage or Transfer
Assigner
References
Impacted products
Vendor Product Version
agronholm cbor2 Affected: >= 3.0.0, < 5.8.0
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2025-64076 (GCVE-0-2025-64076)

Vulnerability from cvelistv5 – Published: 2025-11-18 00:00 – Updated: 2025-11-19 13:55
VLAI?
Summary
Multiple vulnerabilities exist in cbor2 through version 5.7.0 in the decode_definite_long_string() function of the C extension decoder (source/decoder.c): (1) Integer Underflow Leading to Out-of-Bounds Read (CWE-191, CWE-125): An incorrect variable reference and missing state reset in the chunk processing loop causes buffer_length to not be reset to zero after UTF-8 character consumption. This results in subsequent chunk_length calculations producing negative values (e.g., chunk_length = 65536 - buffer_length), which are passed as signed integers to the read() method, potentially triggering unlimited read operations and resource exhaustion. (2) Memory Leak via Missing Reference Count Release (CWE-401): The main processing loop fails to release Python object references (Py_DECREF) for chunk objects allocated in each iteration. For CBOR strings longer than 65536 bytes, this causes cumulative memory leaks proportional to the payload size, enabling memory exhaustion attacks through repeated processing of large CBOR payloads. Both vulnerabilities can be exploited remotely without authentication by sending specially-crafted CBOR data containing definite-length text strings with multi-byte UTF-8 characters positioned at 65536-byte chunk boundaries. Successful exploitation results in denial of service through process crashes (CBORDecodeEOF exceptions) or memory exhaustion. The vulnerabilities affect all applications using cbor2's C extension to process untrusted CBOR data, including web APIs, IoT data collectors, and message queue processors. Fixed in commit 851473490281f82d82560b2368284ef33cf6e8f9 pushed with released version 5.7.1.
Severity ?
7.5 (High)
CVSS:3.1/AC:L/AV:N/A:H/C:N/I:N/PR:N/S:U/UI:N
CWE
  • n/a
Assigner
References
Show details on NVD website
To clipboard 

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CVE-2024-26134 (GCVE-0-2024-26134)

Vulnerability from cvelistv5 – Published: 2024-02-19 22:13 – Updated: 2025-02-13 17:41
VLAI?
Title
CBOR2 decoder has potential buffer overflow
Summary
cbor2 provides encoding and decoding for the Concise Binary Object Representation (CBOR) (RFC 8949) serialization format. Starting in version 5.5.1 and prior to version 5.6.2, an attacker can crash a service using cbor2 to parse a CBOR binary by sending a long enough object. Version 5.6.2 contains a patch for this issue.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
Impacted products
Vendor Product Version
agronholm cbor2 Affected: >= 5.5.1, < 5.6.2
Create a notification for this product.
Show details on NVD website
To clipboard 

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FKIE_CVE-2025-64076

Vulnerability from fkie_nvd - Published: 2025-11-18 18:16 - Updated: 2025-12-31 02:02
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
Multiple vulnerabilities exist in cbor2 through version 5.7.0 in the decode_definite_long_string() function of the C extension decoder (source/decoder.c): (1) Integer Underflow Leading to Out-of-Bounds Read (CWE-191, CWE-125): An incorrect variable reference and missing state reset in the chunk processing loop causes buffer_length to not be reset to zero after UTF-8 character consumption. This results in subsequent chunk_length calculations producing negative values (e.g., chunk_length = 65536 - buffer_length), which are passed as signed integers to the read() method, potentially triggering unlimited read operations and resource exhaustion. (2) Memory Leak via Missing Reference Count Release (CWE-401): The main processing loop fails to release Python object references (Py_DECREF) for chunk objects allocated in each iteration. For CBOR strings longer than 65536 bytes, this causes cumulative memory leaks proportional to the payload size, enabling memory exhaustion attacks through repeated processing of large CBOR payloads. Both vulnerabilities can be exploited remotely without authentication by sending specially-crafted CBOR data containing definite-length text strings with multi-byte UTF-8 characters positioned at 65536-byte chunk boundaries. Successful exploitation results in denial of service through process crashes (CBORDecodeEOF exceptions) or memory exhaustion. The vulnerabilities affect all applications using cbor2's C extension to process untrusted CBOR data, including web APIs, IoT data collectors, and message queue processors. Fixed in commit 851473490281f82d82560b2368284ef33cf6e8f9 pushed with released version 5.7.1.
References
cve@mitre.orghttps://github.com/agronholm/cbor2/commit/851473490281f82d82560b2368284ef33cf6e8f9Patch
cve@mitre.orghttps://github.com/agronholm/cbor2/issues/264Exploit, Issue Tracking
cve@mitre.orghttps://github.com/agronholm/cbor2/pull/265Exploit, Issue Tracking, Patch
Impacted products
Vendor Product Version
agronholm cbor2 *
To clipboard 

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        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "cve@mitre.org",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-11-18T18:16:14.263",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Patch"
      ],
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    },
    {
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      "url": "https://github.com/agronholm/cbor2/issues/264"
    },
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}

FKIE_CVE-2024-26134

Vulnerability from fkie_nvd - Published: 2024-02-19 23:15 - Updated: 2025-01-02 14:18
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
cbor2 provides encoding and decoding for the Concise Binary Object Representation (CBOR) (RFC 8949) serialization format. Starting in version 5.5.1 and prior to version 5.6.2, an attacker can crash a service using cbor2 to parse a CBOR binary by sending a long enough object. Version 5.6.2 contains a patch for this issue.
References
security-advisories@github.comhttps://github.com/agronholm/cbor2/commit/387755eacf0be35591a478d3c67fe10618a6d542Product
security-advisories@github.comhttps://github.com/agronholm/cbor2/commit/4de6991ba29bf2290d7b9d83525eda7d021873dfPatch
security-advisories@github.comhttps://github.com/agronholm/cbor2/pull/204Issue Tracking
security-advisories@github.comhttps://github.com/agronholm/cbor2/releases/tag/5.6.2Release Notes
security-advisories@github.comhttps://github.com/agronholm/cbor2/security/advisories/GHSA-375g-39jq-vq7mExploit, Vendor Advisory
security-advisories@github.comhttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BT42VXZMMMCSSHMA65KKPOZCXJEYHNR5/Mailing List
security-advisories@github.comhttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GX524ZG2XJWFV37UQKQ4LWIH4UICSGEQ/Mailing List
security-advisories@github.comhttps://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PWC3VU6YV6EXKCSX5GTKWLBZIDIJNQJY/Mailing List
af854a3a-2127-422b-91ae-364da2661108https://github.com/agronholm/cbor2/commit/387755eacf0be35591a478d3c67fe10618a6d542Product
af854a3a-2127-422b-91ae-364da2661108https://github.com/agronholm/cbor2/commit/4de6991ba29bf2290d7b9d83525eda7d021873dfPatch
af854a3a-2127-422b-91ae-364da2661108https://github.com/agronholm/cbor2/pull/204Issue Tracking
af854a3a-2127-422b-91ae-364da2661108https://github.com/agronholm/cbor2/releases/tag/5.6.2Release Notes
af854a3a-2127-422b-91ae-364da2661108https://github.com/agronholm/cbor2/security/advisories/GHSA-375g-39jq-vq7mExploit, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BT42VXZMMMCSSHMA65KKPOZCXJEYHNR5/Mailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GX524ZG2XJWFV37UQKQ4LWIH4UICSGEQ/Mailing List
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PWC3VU6YV6EXKCSX5GTKWLBZIDIJNQJY/Mailing List
Impacted products
Vendor Product Version
agronholm cbor2 *
fedoraproject fedora 38
fedoraproject fedora 39
fedoraproject fedora 40
To clipboard 

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