CriticalFix available
varnish — security advisory
Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass.
- Products
- varnish
- Affected versions
- 7.1.1-1.1, 7.1.1-1.1+deb12u1, 7.1.1-1.2, 7.1.1-2+deb12u1, 7.5.0-1, 7.5.0-2, 7.5.0-3, 7.6.0-1, 7.6.0-2, 7.6.1-1, 7.6.1-2, 7.7.0-1, 7.7.0-2, 7.7.0-3, 7.7.0-3+deb13u1, 7.7.1-1, 7.7.2-1, 7.7.2-2, 7.7.3-1, 7.7.3-2, 7.7.3-3
- Fixed versions
- 7.7.0-3+deb13u2
- CVEs
- CVE-2026-34475
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:38 UTC · Revision 2
Source evidence
Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass.
osv:DEBIAN-CVE-2026-34475
varnish
Fixed versions: Not specified
varnish
Fixed versions: 7.7.0-3+deb13u2
Complete source record
{
"id": "bb3e5bf93c659f15d7084c3095d7570d5426213752a6d8e370ea73c70c516450",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-34475",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-34475",
"summary": "Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass.",
"evidence": "osv:DEBIAN-CVE-2026-34475",
"products": [
{
"name": {
"value": "varnish",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "7.1.1-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "7.1.1-1.1+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "7.1.1-1.2",
"evidence": "/affected/0/versions"
},
{
"value": "7.1.1-2+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "7.5.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "7.5.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "7.5.0-3",
"evidence": "/affected/0/versions"
},
{
"value": "7.6.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "7.6.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "7.6.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "7.6.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "7.7.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "7.7.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "7.7.0-3",
"evidence": "/affected/0/versions"
},
{
"value": "7.7.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "7.7.2-1",
"evidence": "/affected/0/versions"
},
{
"value": "7.7.2-2",
"evidence": "/affected/0/versions"
},
{
"value": "7.7.3-1",
"evidence": "/affected/0/versions"
},
{
"value": "7.7.3-2",
"evidence": "/affected/0/versions"
},
{
"value": "7.7.3-3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "varnish",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.7.0-3+deb13u2",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "7.7.0-3",
"evidence": "/affected/1/versions"
},
{
"value": "7.7.0-3+deb13u1",
"evidence": "/affected/1/versions"
}
]
}
],
"severity": "critical",
"structured": {
"id": "DEBIAN-CVE-2026-34475",
"aliases": [
"DEBIAN-CVE-2026-34475"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "varnish",
"purl": "pkg:deb/debian/varnish?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"7.1.1-1.1",
"7.1.1-1.1+deb12u1",
"7.1.1-1.2",
"7.1.1-2+deb12u1",
"7.5.0-1",
"7.5.0-2",
"7.5.0-3",
"7.6.0-1",
"7.6.0-2",
"7.6.1-1",
"7.6.1-2",
"7.7.0-1",
"7.7.0-2",
"7.7.0-3",
"7.7.1-1",
"7.7.2-1",
"7.7.2-2",
"7.7.3-1",
"7.7.3-2",
"7.7.3-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34475.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.7.0-3+deb13u2"
}
]
}
],
"package": {
"name": "varnish",
"purl": "pkg:deb/debian/varnish?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"7.7.0-3",
"7.7.0-3+deb13u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-34475.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T09:47:31.517054084Z",
"provider": "osv",
"upstream": [
"CVE-2026-34475"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-34475"
]
},
"related_cves": [
{
"value": "CVE-2026-34475",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 460938,
"published_at": "2026-03-27T20:16:36.39+00:00"
}