UnratedFix available
Fix CVE(s): CVE-2026-49975
Type: advisorySources: OSV
* SECURITY UPDATE: denial of service via an unbounded number of HTTP/2 request header lines - debian/patches/CVE-2026-49975.patch: add the max_headers directive (default 1000) and enforce it in ngx_http_process_request_headers() and ngx_http_v2_state_process_header(), so a client can no longer drive unbounded per-request header-list growth over HTTP/2; the counter is appended to the end of struct ngx_http_request_s (not inside ngx_http_headers_in_t, which is embedded by value and would shift every later request field) and max_headers to the end of ngx_http_core_srv_conf_t, so every existing field offset is preserved and prebuilt third-party dynamic modules stay ABI-compatible - CVE-2026-49975
- Products
- libnginx-mod-http-auth-pam, libnginx-mod-http-cache-purge, libnginx-mod-http-dav-ext, libnginx-mod-http-echo, libnginx-mod-http-fancyindex, libnginx-mod-http-geoip, libnginx-mod-http-geoip2, libnginx-mod-http-headers-more-filter, libnginx-mod-http-image-filter, libnginx-mod-http-lua, libnginx-mod-http-ndk, libnginx-mod-http-perl, libnginx-mod-http-subs-filter, libnginx-mod-http-uploadprogress, libnginx-mod-http-upstream-fair, libnginx-mod-http-xslt-filter, libnginx-mod-mail, libnginx-mod-nchan, libnginx-mod-rtmp, libnginx-mod-stream, nginx, nginx-common, nginx-core, nginx-doc, nginx-extras, nginx-full, nginx-light
- Affected versions
- Not specified
- Fixed versions
- 1.18.0-0ubuntu1.7+tuxcare.els8
- CVEs
- CVE-2026-49975
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 10:59 UTC · Revision 1
Source evidence
* SECURITY UPDATE: denial of service via an unbounded number of HTTP/2 request header lines - debian/patches/CVE-2026-49975.patch: add the max_headers directive (default 1000) and enforce it in ngx_http_process_request_headers() and ngx_http_v2_state_process_header(), so a client can no longer drive unbounded per-request header-list growth over HTTP/2; the counter is appended to the end of struct ngx_http_request_s (not inside ngx_http_headers_in_t, which is embedded by value and would shift every later request field) and max_headers to the end of ngx_http_core_srv_conf_t, so every existing field offset is preserved and prebuilt third-party dynamic modules stay ABI-compatible - CVE-2026-49975
osv:CLSA-2026-1790158682
libnginx-mod-http-auth-pam
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-cache-purge
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-dav-ext
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-echo
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-fancyindex
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-geoip
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-geoip2
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-headers-more-filter
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-image-filter
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-lua
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-ndk
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-perl
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-subs-filter
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-uploadprogress
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-upstream-fair
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-http-xslt-filter
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-mail
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-nchan
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-rtmp
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
libnginx-mod-stream
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
nginx
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
nginx-common
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
nginx-core
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
nginx-doc
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
nginx-extras
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
nginx-full
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
nginx-light
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els8
Complete source record
{
"id": "60f6c15e05b54ad427ccd32cc3bba4061a8764788b607c3bef2f496673e34282",
"url": "https://osv.dev/vulnerability/CLSA-2026-1790158682",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-49975",
"summary": "* SECURITY UPDATE: denial of service via an unbounded number of HTTP/2 request header lines - debian/patches/CVE-2026-49975.patch: add the max_headers directive (default 1000) and enforce it in ngx_http_process_request_headers() and ngx_http_v2_state_process_header(), so a client can no longer drive unbounded per-request header-list growth over HTTP/2; the counter is appended to the end of struct ngx_http_request_s (not inside ngx_http_headers_in_t, which is embedded by value and would shift every later request field) and max_headers to the end of ngx_http_core_srv_conf_t, so every existing field offset is preserved and prebuilt third-party dynamic modules stay ABI-compatible - CVE-2026-49975",
"evidence": "osv:CLSA-2026-1790158682",
"products": [
{
"name": {
"value": "libnginx-mod-http-auth-pam",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-cache-purge",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-dav-ext",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-echo",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-fancyindex",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-geoip",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-geoip2",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-headers-more-filter",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-image-filter",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-lua",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-ndk",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-perl",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/11/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-subs-filter",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/12/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-uploadprogress",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/13/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-upstream-fair",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/14/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-xslt-filter",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/15/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-mail",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/16/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-nchan",
"evidence": "/affected/17/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/17/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-rtmp",
"evidence": "/affected/18/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/18/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-stream",
"evidence": "/affected/19/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/19/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx",
"evidence": "/affected/20/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/20/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-common",
"evidence": "/affected/21/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/21/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-core",
"evidence": "/affected/22/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/22/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-doc",
"evidence": "/affected/23/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/23/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-extras",
"evidence": "/affected/24/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/24/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-full",
"evidence": "/affected/25/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/25/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx-light",
"evidence": "/affected/26/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els8",
"evidence": "/affected/26/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1790158682",
"aliases": [
"CLSA-2026-1790158682"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els8"
}
]
}
],
"package": {
"name": "libnginx-mod-http-auth-pam",
"purl": "pkg:deb/tuxcare/libnginx-mod-http-auth-pam?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1790158682.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els8"
}
]
}
],
"package": {
"name": "libnginx-mod-http-cache-purge",
"purl": "pkg:deb/tuxcare/libnginx-mod-http-cache-purge?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1790158682.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els8"
}
]
}
],
"package": {
"name": "libnginx-mod-http-dav-ext",
"purl": "pkg:deb/tuxcare/libnginx-mod-http-dav-ext?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1790158682.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els8"
}
]
}
],
"package": {
"name": "libnginx-mod-http-echo",
"purl": "pkg:deb/tuxcare/libnginx-mod-http-echo?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1790158682.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els8"
}
]
}
],
"package": {
"name": "libnginx-mod-http-fancyindex",
"purl": "pkg:deb/tuxcare/libnginx-mod-http-fancyindex?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1790158682.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els8"
}
]
}
],
"package": {
"name": "libnginx-mod-http-geoip",
"purl": "pkg:deb/tuxcare/libnginx-mod-http-geoip?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1790158682.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els8"
}
]
}
],
"package": {
"name": "libnginx-mod-http-geoip2",
"purl": "pkg:deb/tuxcare/libnginx-mod-http-geoip2?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1790158682.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els8"
}
]
}
],
"package": {
"name": "libnginx-mod-http-headers-more-filter",
"purl": "pkg:deb/tuxcare/libnginx-mod-http-headers-more-filter?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1790158682.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els8"
}
]
}
],
"package": {
"name": "libnginx-mod-http-image-filter",
"purl": "pkg:deb/tuxcare/libnginx-mod-http-image-filter?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1790158682.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els8"
}
]
}
],
"package": {
"name": "libnginx-mod-http-lua",
"purl": "pkg:deb/tuxcare/libnginx-mod-http-lua?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1790158682.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els8"
}
]
}
],
"package": {
"name": "libnginx-mod-http-ndk",
"purl": "pkg:deb/tuxcare/libnginx-mod-http-ndk?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1790158682.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els8"
}
]
}
],
"package": {
"name": "libnginx-mod-http-perl",
"purl": "pkg:deb/tuxcare/libnginx-mod-http-perl?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu20.04els/CLSA-2026-1790158682.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els8"
}
]
}
],
"package": {
"name": "libnginx-mod-http-subs-filter",
"purl": "pkg:deb/tuxcare/libnginx-mod-http-subs-filter?distro=ubuntu-20.04",
"ecosystem": "TuxCare:Ubuntu:20.04"
},
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],
"modified": "2026-10-26T09:31:40.145268721Z",
"provider": "osv",
"upstream": [
"CVE-2026-49975"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1790158682.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-49975"
]
},
"related_cves": [
{
"value": "CVE-2026-49975",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 448022,
"published_at": "2026-09-23T10:18:13+00:00"
}