usn-8563-3
Vulnerability from osv_ubuntu
Published
2026-08-19 12:01
Modified
2026-08-19 21:07
Summary
nginx vulnerability
Details
USN-8563-1 fixed vulnerabilities in nginx. The fix for CVE-2026-42533 was backed out in USN-8563-2 because it could cause a regression. This update includes a better fix for CVE-2026-42533.
We apologize for the inconvenience.
Original advisory details:
It was discovered that nginx incorrectly handled certain map directives using regex matching and capture variables. A remote attacker could use this issue to cause nginx to crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2026-42533)
It was discovered that nginx had a use-after-free vulnerability in the ngx_http_ssi_module module when configured with Server-Side Includes, proxy_pass, and proxy buffering disabled directives. An attacker able to intercept traffic and control responses from an upstream server could possibly use this issue to cause nginx to crash, resulting in a denial of service. (CVE-2026-56434)
It was discovered that nginx incorrectly handled certain requests in the ngx_http_slice_module module. A remote attacker could possibly use this issue to obtain sensitive information or cause nginx to crash, resulting in a denial of service. (CVE-2026-60005)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:22.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnginx-mod-http-auth-pam",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-cache-purge",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-dav-ext",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-echo",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-fancyindex",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-geoip",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-geoip2",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-headers-more-filter",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-image-filter",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-ndk",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-perl",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-subs-filter",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-uploadprogress",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-upstream-fair",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-http-xslt-filter",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-mail",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-nchan",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-rtmp",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-stream",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-stream-geoip",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "libnginx-mod-stream-geoip2",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "nginx",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "nginx-common",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "nginx-core",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "nginx-extras",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "nginx-full",
"binary_version": "1.18.0-6ubuntu14.19"
},
{
"binary_name": "nginx-light",
"binary_version": "1.18.0-6ubuntu14.19"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "nginx",
"purl": "pkg:deb/ubuntu/nginx@1.18.0-6ubuntu14.19?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-6ubuntu14.19"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.18.0-6ubuntu11",
"1.18.0-6ubuntu12",
"1.18.0-6ubuntu14",
"1.18.0-6ubuntu14.1",
"1.18.0-6ubuntu14.2",
"1.18.0-6ubuntu14.3",
"1.18.0-6ubuntu14.4",
"1.18.0-6ubuntu14.5",
"1.18.0-6ubuntu14.6",
"1.18.0-6ubuntu14.7",
"1.18.0-6ubuntu14.8",
"1.18.0-6ubuntu14.10",
"1.18.0-6ubuntu14.11",
"1.18.0-6ubuntu14.12",
"1.18.0-6ubuntu14.13",
"1.18.0-6ubuntu14.14",
"1.18.0-6ubuntu14.15",
"1.18.0-6ubuntu14.16",
"1.18.0-6ubuntu14.17",
"1.18.0-6ubuntu14.18"
]
},
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:24.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnginx-mod-http-geoip",
"binary_version": "1.24.0-2ubuntu7.16"
},
{
"binary_name": "libnginx-mod-http-image-filter",
"binary_version": "1.24.0-2ubuntu7.16"
},
{
"binary_name": "libnginx-mod-http-perl",
"binary_version": "1.24.0-2ubuntu7.16"
},
{
"binary_name": "libnginx-mod-http-xslt-filter",
"binary_version": "1.24.0-2ubuntu7.16"
},
{
"binary_name": "libnginx-mod-mail",
"binary_version": "1.24.0-2ubuntu7.16"
},
{
"binary_name": "libnginx-mod-stream",
"binary_version": "1.24.0-2ubuntu7.16"
},
{
"binary_name": "libnginx-mod-stream-geoip",
"binary_version": "1.24.0-2ubuntu7.16"
},
{
"binary_name": "nginx",
"binary_version": "1.24.0-2ubuntu7.16"
},
{
"binary_name": "nginx-common",
"binary_version": "1.24.0-2ubuntu7.16"
},
{
"binary_name": "nginx-core",
"binary_version": "1.24.0-2ubuntu7.16"
},
{
"binary_name": "nginx-extras",
"binary_version": "1.24.0-2ubuntu7.16"
},
{
"binary_name": "nginx-full",
"binary_version": "1.24.0-2ubuntu7.16"
},
{
"binary_name": "nginx-light",
"binary_version": "1.24.0-2ubuntu7.16"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "nginx",
"purl": "pkg:deb/ubuntu/nginx@1.24.0-2ubuntu7.16?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.24.0-2ubuntu7.16"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.24.0-1ubuntu1",
"1.24.0-2ubuntu1",
"1.24.0-2ubuntu2",
"1.24.0-2ubuntu3",
"1.24.0-2ubuntu4",
"1.24.0-2ubuntu6",
"1.24.0-2ubuntu7",
"1.24.0-2ubuntu7.1",
"1.24.0-2ubuntu7.3",
"1.24.0-2ubuntu7.4",
"1.24.0-2ubuntu7.5",
"1.24.0-2ubuntu7.6",
"1.24.0-2ubuntu7.7",
"1.24.0-2ubuntu7.8",
"1.24.0-2ubuntu7.9",
"1.24.0-2ubuntu7.10",
"1.24.0-2ubuntu7.11",
"1.24.0-2ubuntu7.12",
"1.24.0-2ubuntu7.13",
"1.24.0-2ubuntu7.14",
"1.24.0-2ubuntu7.15"
]
},
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "libnginx-mod-http-geoip",
"binary_version": "1.28.3-2ubuntu1.9"
},
{
"binary_name": "libnginx-mod-http-image-filter",
"binary_version": "1.28.3-2ubuntu1.9"
},
{
"binary_name": "libnginx-mod-http-perl",
"binary_version": "1.28.3-2ubuntu1.9"
},
{
"binary_name": "libnginx-mod-http-xslt-filter",
"binary_version": "1.28.3-2ubuntu1.9"
},
{
"binary_name": "libnginx-mod-mail",
"binary_version": "1.28.3-2ubuntu1.9"
},
{
"binary_name": "libnginx-mod-stream",
"binary_version": "1.28.3-2ubuntu1.9"
},
{
"binary_name": "libnginx-mod-stream-geoip",
"binary_version": "1.28.3-2ubuntu1.9"
},
{
"binary_name": "nginx",
"binary_version": "1.28.3-2ubuntu1.9"
},
{
"binary_name": "nginx-common",
"binary_version": "1.28.3-2ubuntu1.9"
},
{
"binary_name": "nginx-core",
"binary_version": "1.28.3-2ubuntu1.9"
},
{
"binary_name": "nginx-extras",
"binary_version": "1.28.3-2ubuntu1.9"
},
{
"binary_name": "nginx-full",
"binary_version": "1.28.3-2ubuntu1.9"
},
{
"binary_name": "nginx-light",
"binary_version": "1.28.3-2ubuntu1.9"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "nginx",
"purl": "pkg:deb/ubuntu/nginx@1.28.3-2ubuntu1.9?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.28.3-2ubuntu1.9"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.28.0-6ubuntu1",
"1.28.1-2ubuntu1",
"1.28.1-3ubuntu1",
"1.28.2-2ubuntu1",
"1.28.3-2ubuntu1",
"1.28.3-2ubuntu1.1",
"1.28.3-2ubuntu1.2",
"1.28.3-2ubuntu1.3",
"1.28.3-2ubuntu1.4",
"1.28.3-2ubuntu1.5",
"1.28.3-2ubuntu1.6",
"1.28.3-2ubuntu1.7",
"1.28.3-2ubuntu1.8"
]
}
],
"aliases": [],
"details": "USN-8563-1 fixed vulnerabilities in nginx. The fix for CVE-2026-42533 was\nbacked out in USN-8563-2 because it could cause a regression. This update\nincludes a better fix for CVE-2026-42533.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n It was discovered that nginx incorrectly handled certain map directives\n using regex matching and capture variables. A remote attacker could use\n this issue to cause nginx to crash, resulting in a denial of service, or\n possibly execute arbitrary code. (CVE-2026-42533)\n\n It was discovered that nginx had a use-after-free vulnerability in the\n ngx_http_ssi_module module when configured with Server-Side Includes,\n proxy_pass, and proxy buffering disabled directives. An attacker able to\n intercept traffic and control responses from an upstream server could\n possibly use this issue to cause nginx to crash, resulting in a denial of\n service. (CVE-2026-56434)\n\n It was discovered that nginx incorrectly handled certain requests in the\n ngx_http_slice_module module. A remote attacker could possibly use this\n issue to obtain sensitive information or cause nginx to crash, resulting\n in a denial of service. (CVE-2026-60005)",
"id": "USN-8563-3",
"modified": "2026-08-19T21:07:24Z",
"published": "2026-08-19T12:01:08Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8563-3"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-42533"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "nginx vulnerability",
"upstream": [
"UBUNTU-CVE-2026-42533"
]
}
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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.
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.
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