UnratedFix available
Fix CVE(s): CVE-2026-27135
Type: advisorySources: OSV
* SECURITY UPDATE: assertion failure in nghttp2 HTTP/2 frame processing - debian/patches/CVE-2026-27135-1.patch: add missing iframe->state validations in nghttp2_session_mem_recv so that reception stops once the session has been terminated, avoiding an assertion failure on a subsequent malformed frame - debian/patches/CVE-2026-27135-2.patch: add the same validation after session_after_header_block_received and after session_process_data_frame, which upstream carries since 1.67.0 and which the fix above therefore does not touch - CVE-2026-27135
- Products
- libnghttp2-14, libnghttp2-dev, libnghttp2-doc, nghttp2, nghttp2-client, nghttp2-proxy, nghttp2-server
- Affected versions
- Not specified
- Fixed versions
- 1.36.0-2+deb10u3+tuxcare.els2
- CVEs
- CVE-2026-27135
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:22 UTC · Revision 1
Source evidence
* SECURITY UPDATE: assertion failure in nghttp2 HTTP/2 frame processing - debian/patches/CVE-2026-27135-1.patch: add missing iframe->state validations in nghttp2_session_mem_recv so that reception stops once the session has been terminated, avoiding an assertion failure on a subsequent malformed frame - debian/patches/CVE-2026-27135-2.patch: add the same validation after session_after_header_block_received and after session_process_data_frame, which upstream carries since 1.67.0 and which the fix above therefore does not touch - CVE-2026-27135
osv:CLSA-2026-1787303674
libnghttp2-14
Fixed versions: 1.36.0-2+deb10u3+tuxcare.els2
libnghttp2-dev
Fixed versions: 1.36.0-2+deb10u3+tuxcare.els2
libnghttp2-doc
Fixed versions: 1.36.0-2+deb10u3+tuxcare.els2
nghttp2
Fixed versions: 1.36.0-2+deb10u3+tuxcare.els2
nghttp2-client
Fixed versions: 1.36.0-2+deb10u3+tuxcare.els2
nghttp2-proxy
Fixed versions: 1.36.0-2+deb10u3+tuxcare.els2
nghttp2-server
Fixed versions: 1.36.0-2+deb10u3+tuxcare.els2
Complete source record
{
"id": "8c282063c7044ea4391406225cfd345a5bace048c635cd95573a28d4255daff2",
"url": "https://osv.dev/vulnerability/CLSA-2026-1787303674",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2026-27135",
"summary": "* SECURITY UPDATE: assertion failure in nghttp2 HTTP/2 frame processing - debian/patches/CVE-2026-27135-1.patch: add missing iframe->state validations in nghttp2_session_mem_recv so that reception stops once the session has been terminated, avoiding an assertion failure on a subsequent malformed frame - debian/patches/CVE-2026-27135-2.patch: add the same validation after session_after_header_block_received and after session_process_data_frame, which upstream carries since 1.67.0 and which the fix above therefore does not touch - CVE-2026-27135",
"evidence": "osv:CLSA-2026-1787303674",
"products": [
{
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"evidence": "/affected/0/package/name"
},
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"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
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{
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"affected_versions": []
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{
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"affected_versions": []
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{
"name": {
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],
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},
{
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{
"name": {
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"evidence": "/affected/5/package/name"
},
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{
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},
{
"name": {
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"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1787303674",
"aliases": [
"CLSA-2026-1787303674"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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{
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}
]
}
],
"package": {
"name": "libnghttp2-14",
"purl": "pkg:deb/tuxcare/libnghttp2-14?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787303674.json"
}
},
{
"ranges": [
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],
"package": {
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"purl": "pkg:deb/tuxcare/libnghttp2-dev?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
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{
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],
"package": {
"name": "libnghttp2-doc",
"purl": "pkg:deb/tuxcare/libnghttp2-doc?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
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}
},
{
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"package": {
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"purl": "pkg:deb/tuxcare/nghttp2?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
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}
},
{
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],
"package": {
"name": "nghttp2-client",
"purl": "pkg:deb/tuxcare/nghttp2-client?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787303674.json"
}
},
{
"ranges": [
{
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{
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},
{
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}
]
}
],
"package": {
"name": "nghttp2-proxy",
"purl": "pkg:deb/tuxcare/nghttp2-proxy?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787303674.json"
}
},
{
"ranges": [
{
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{
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}
]
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],
"package": {
"name": "nghttp2-server",
"purl": "pkg:deb/tuxcare/nghttp2-server?distro=debian-10",
"ecosystem": "TuxCare:Debian:10"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/debian10els/CLSA-2026-1787303674.json"
}
}
],
"modified": "2026-10-26T09:31:52.825164304Z",
"provider": "osv",
"upstream": [
"CVE-2026-27135"
],
"references": [
"https://errata.tuxcare.com/els_os/debian10els/CLSA-2026-1787303674.html",
"https://nvd.nist.gov/vuln/detail/CVE-2026-27135"
]
},
"related_cves": [
{
"value": "CVE-2026-27135",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 448802,
"published_at": "2026-08-21T09:14:44+00:00"
}