ubuntu-cve-2026-42926
Vulnerability from osv_ubuntu
Published
2026-05-13 16:16
Modified
2026-05-20 21:47
Summary
Details
When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Severity
5.8 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
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{
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},
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{
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{
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{
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},
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}
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{
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"binary_name": "libnginx-mod-http-echo",
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{
"binary_name": "libnginx-mod-http-headers-more-filter",
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{
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},
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"ecosystem": "Ubuntu:25.10",
"name": "nginx",
"purl": "pkg:deb/ubuntu/nginx@1.28.0-6ubuntu1.3?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.26.3-2ubuntu1",
"1.26.3-3ubuntu1",
"1.26.3-3ubuntu2",
"1.26.3-3ubuntu3",
"1.28.0-3ubuntu1",
"1.28.0-4ubuntu1",
"1.28.0-6ubuntu1",
"1.28.0-6ubuntu1.1",
"1.28.0-6ubuntu1.2",
"1.28.0-6ubuntu1.3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnginx-mod-http-geoip",
"binary_version": "1.28.3-2ubuntu1.1"
},
{
"binary_name": "libnginx-mod-http-image-filter",
"binary_version": "1.28.3-2ubuntu1.1"
},
{
"binary_name": "libnginx-mod-http-perl",
"binary_version": "1.28.3-2ubuntu1.1"
},
{
"binary_name": "libnginx-mod-http-xslt-filter",
"binary_version": "1.28.3-2ubuntu1.1"
},
{
"binary_name": "libnginx-mod-mail",
"binary_version": "1.28.3-2ubuntu1.1"
},
{
"binary_name": "libnginx-mod-stream",
"binary_version": "1.28.3-2ubuntu1.1"
},
{
"binary_name": "libnginx-mod-stream-geoip",
"binary_version": "1.28.3-2ubuntu1.1"
},
{
"binary_name": "nginx",
"binary_version": "1.28.3-2ubuntu1.1"
},
{
"binary_name": "nginx-common",
"binary_version": "1.28.3-2ubuntu1.1"
},
{
"binary_name": "nginx-core",
"binary_version": "1.28.3-2ubuntu1.1"
},
{
"binary_name": "nginx-extras",
"binary_version": "1.28.3-2ubuntu1.1"
},
{
"binary_name": "nginx-full",
"binary_version": "1.28.3-2ubuntu1.1"
},
{
"binary_name": "nginx-light",
"binary_version": "1.28.3-2ubuntu1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "nginx",
"purl": "pkg:deb/ubuntu/nginx@1.28.3-2ubuntu1.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"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"
]
}
],
"aliases": [],
"details": "When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version\u00a0to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer.\u00a0 Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
"id": "UBUNTU-CVE-2026-42926",
"modified": "2026-05-20T21:47:05Z",
"published": "2026-05-13T16:16:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-42926"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-42926"
},
{
"type": "REPORT",
"url": "https://my.f5.com/manage/s/article/K000161131"
},
{
"type": "REPORT",
"url": "https://nginx.org/en/security_advisories.html"
},
{
"type": "REPORT",
"url": "https://github.com/nginx/nginx/commit/ce3362cfd5c3e1434a6151cfa585b89114389da7"
},
{
"type": "REPORT",
"url": "https://github.com/nginx/nginx/commit/a0e742944db64d8a547cc2e7a0ba4c2e85cd4b98"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-42926"
],
"withdrawn": "2026-05-30T15:49:18Z"
}
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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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