UnratedFix available
Fix CVE(s): CVE-2026-15176, CVE-2026-56434
Type: advisorySources: OSV
* SECURITY UPDATE: heap buffer overflow when mapping a rewritten URI to a path in a location using alias - debian/patches/CVE-2026-15176.patch: reject URI to path mapping in ngx_http_map_uri_to_path() when r->uri_changed is set, so a rewrite that shortens the URI below the alias location prefix can no longer overflow the path buffer through $request_filename - CVE-2026-15176 * SECURITY UPDATE: use-after-free via duplicate subrequest finalization - debian/patches/CVE-2026-56434.patch: skip posting a request in ngx_http_post_request() if it is already posted, and reset the subrequest write event handler during finalization in ngx_http_finalize_request(), so an SSI subrequest double-posted during unbuffered proxying can no longer be finalized twice - CVE-2026-56434
- 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.els10
- CVEs
- CVE-2026-15176, CVE-2026-56434
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:45 UTC · Revision 1
Source evidence
Fix CVE(s): CVE-2026-15176, CVE-2026-56434
core-osv · Original sourcePublished 20 Oct 2026, 09:12 UTC
* SECURITY UPDATE: heap buffer overflow when mapping a rewritten URI to a path in a location using alias - debian/patches/CVE-2026-15176.patch: reject URI to path mapping in ngx_http_map_uri_to_path() when r->uri_changed is set, so a rewrite that shortens the URI below the alias location prefix can no longer overflow the path buffer through $request_filename - CVE-2026-15176 * SECURITY UPDATE: use-after-free via duplicate subrequest finalization - debian/patches/CVE-2026-56434.patch: skip posting a request in ngx_http_post_request() if it is already posted, and reset the subrequest write event handler during finalization in ngx_http_finalize_request(), so an SSI subrequest double-posted during unbuffered proxying can no longer be finalized twice - CVE-2026-56434
osv:CLSA-2026-1792487559
libnginx-mod-http-auth-pam
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-cache-purge
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-dav-ext
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-echo
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-fancyindex
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-geoip
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-geoip2
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-headers-more-filter
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-image-filter
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-lua
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-ndk
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-perl
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-subs-filter
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-uploadprogress
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-upstream-fair
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-http-xslt-filter
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-mail
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-nchan
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-rtmp
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
libnginx-mod-stream
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
nginx
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
nginx-common
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
nginx-core
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
nginx-doc
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
nginx-extras
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
nginx-full
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
nginx-light
Fixed versions: 1.18.0-0ubuntu1.7+tuxcare.els10
Complete source record
{
"id": "ff864dbb31d2b251e96de61eba53fc1d4359d84d7d2007bb8442ddf837dc5221",
"url": "https://osv.dev/vulnerability/CLSA-2026-1792487559",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-15176, CVE-2026-56434",
"summary": "* SECURITY UPDATE: heap buffer overflow when mapping a rewritten URI to a path in a location using alias - debian/patches/CVE-2026-15176.patch: reject URI to path mapping in ngx_http_map_uri_to_path() when r->uri_changed is set, so a rewrite that shortens the URI below the alias location prefix can no longer overflow the path buffer through $request_filename - CVE-2026-15176 * SECURITY UPDATE: use-after-free via duplicate subrequest finalization - debian/patches/CVE-2026-56434.patch: skip posting a request in ngx_http_post_request() if it is already posted, and reset the subrequest write event handler during finalization in ngx_http_finalize_request(), so an SSI subrequest double-posted during unbuffered proxying can no longer be finalized twice - CVE-2026-56434",
"evidence": "osv:CLSA-2026-1792487559",
"products": [
{
"name": {
"value": "libnginx-mod-http-auth-pam",
"evidence": "/affected/0/package/name"
},
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{
"value": "1.18.0-0ubuntu1.7+tuxcare.els10",
"evidence": "/affected/0/ranges"
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"affected_versions": []
},
{
"name": {
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"evidence": "/affected/1/package/name"
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"prerequisites": [],
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{
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"evidence": "/affected/1/ranges"
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],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/2/package/name"
},
"prerequisites": [],
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{
"value": "1.18.0-0ubuntu1.7+tuxcare.els10",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libnginx-mod-http-echo",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/3/ranges"
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],
"affected_versions": []
},
{
"name": {
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"evidence": "/affected/4/package/name"
},
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{
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"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.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"evidence": "/affected/19/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "nginx",
"evidence": "/affected/20/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.18.0-0ubuntu1.7+tuxcare.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"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.els10",
"evidence": "/affected/26/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1792487559",
"aliases": [
"CLSA-2026-1792487559"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
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},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els10"
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]
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],
"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-2026-1792487559.json"
}
},
{
"ranges": [
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{
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],
"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-2026-1792487559.json"
}
},
{
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"events": [
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{
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],
"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-2026-1792487559.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els10"
}
]
}
],
"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-2026-1792487559.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els10"
}
]
}
],
"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-2026-1792487559.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els10"
}
]
}
],
"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-2026-1792487559.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els10"
}
]
}
],
"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-2026-1792487559.json"
}
},
{
"ranges": [
{
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"events": [
{
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},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els10"
}
]
}
],
"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-2026-1792487559.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els10"
}
]
}
],
"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-2026-1792487559.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els10"
}
]
}
],
"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-2026-1792487559.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els10"
}
]
}
],
"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-2026-1792487559.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.18.0-0ubuntu1.7+tuxcare.els10"
}
]
}
],
"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-2026-1792487559.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
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],
"modified": "2026-10-26T09:32:05.641055816Z",
"provider": "osv",
"upstream": [
"CVE-2026-15176",
"CVE-2026-56434"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu20.04els/CLSA-2026-1792487559.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-15176",
"https://nvd.nist.gov/vuln/detail/CVE-2026-56434"
]
},
"related_cves": [
{
"value": "CVE-2026-15176",
"evidence": "/upstream"
},
{
"value": "CVE-2026-56434",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449716,
"published_at": "2026-10-20T09:12:52+00:00"
}