CVE catalog

CVE-2026-50052

In Vinyl Cache before 9.0.1 and Varnish Cache before 9.0.3, a deficiency in HTTP/2 request parsing can be exploited to launch a backend request desync attack (request smuggling), which in turn can be

[CVE catalog]

Severity: Low · CVSS 2.3
Published: May 18, 2026, 10:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.38% · Oct 25, 2026

In Vinyl Cache before 9.0.1 and Varnish Cache before 9.0.3, a deficiency in HTTP/2 request parsing can be exploited to launch a backend request desync attack (request smuggling), which in turn can be used for cache poisoning, authentication bypass, or possibly even information disclosure and manipulation. The attack vector only exists if HTTP/2 support is enabled by setting the feature parameter to contain +http2. HTTP/2 support is disabled by default.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	varnish	trixie	`7.7.0-3+deb13u1`	fixed
Debian	varnish	trixie-security	`7.7.0-3+deb13u2`	fixed
Debian	varnish	bookworm	`7.1.1-2+deb12u1`	not affected
Debian	varnish	bookworm-security	`7.1.1-2+deb12u1`	not affected
Opensuse	vinyl-cache	tumbleweed	`9.0.1-1.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	varnish	source	trixie	`7.7.0-3+deb13u1`	not yet assigned	Not reported	[1138778]
Debian	varnish	source	bookworm	`Not affected`	unimportant	Not reported	[1138778]
Opensuse	vinyl-cache	rpm	tumbleweed	`9.0.1-1.1`	Not reported	OPENSUSE-SU-2026:11039-1	Not reported

[Debian bug #1138778]

OpenFactory catalog packages

[openSUSE Tumbleweed]

[libvinylapi3]Unknown
Source package: [vinyl-cache]
Details (1)
- 9.0.1-3.1 · x86_64 · tumbleweed
  Unknown · Fixed: 9.0.1-1.1
  Version impact unknown
  nvd · vinyl-cache · opensuse · tumbleweed
[vinyl-cache-devel]Unknown
Source package: [vinyl-cache]
Details (1)
- 9.0.1-3.1 · x86_64 · tumbleweed
  Unknown · Fixed: 9.0.1-1.1
  Version impact unknown
  nvd · vinyl-cache · opensuse · tumbleweed
[vinyl-cache]Fixed
Source package: [vinyl-cache]
Details (1)
- 9.0.1-3.1 · x86_64 · tumbleweed
  Fixed · Fixed: 9.0.1-1.1
  nvd · vinyl-cache · opensuse · tumbleweed

[Debian 12 (Bookworm)]

[libvarnishapi3]Not affected
Source package: [varnish]
Details (4)
- 7.1.1-2+deb12u1 · amd64 · bookworm
  Not affected
  nvd · varnish · debian · bookworm
- 7.1.1-2+deb12u1 · arm64 · bookworm
  Not affected
  nvd · varnish · debian · bookworm
- 7.1.1-2+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · varnish · debian · bookworm
- 7.1.1-2+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · varnish · debian · bookworm
[libvarnishapi-dev]Not affected
Source package: [varnish]
Details (4)
- 7.1.1-2+deb12u1 · amd64 · bookworm
  Not affected
  nvd · varnish · debian · bookworm
- 7.1.1-2+deb12u1 · arm64 · bookworm
  Not affected
  nvd · varnish · debian · bookworm
- 7.1.1-2+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · varnish · debian · bookworm
- 7.1.1-2+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · varnish · debian · bookworm
[varnish]Not affected
Details (4)
- 7.1.1-2+deb12u1 · amd64 · bookworm
  Not affected
  nvd · varnish · debian · bookworm
- 7.1.1-2+deb12u1 · arm64 · bookworm
  Not affected
  nvd · varnish · debian · bookworm
- 7.1.1-2+deb12u1 · amd64 · bookworm-security
  Not affected
  nvd · varnish · debian · bookworm
- 7.1.1-2+deb12u1 · arm64 · bookworm-security
  Not affected
  nvd · varnish · debian · bookworm
[varnish-doc]Not affected
Source package: [varnish]
Details (4)
- 7.1.1-2+deb12u1 · all · bookworm
  Not affected
  nvd · varnish · debian · bookworm
- 7.1.1-2+deb12u1 · all · bookworm
  Not affected
  nvd · varnish · debian · bookworm
- 7.1.1-2+deb12u1 · all · bookworm-security
  Not affected
  nvd · varnish · debian · bookworm
- 7.1.1-2+deb12u1 · all · bookworm-security
  Not affected
  nvd · varnish · debian · bookworm

[Debian 13 (Trixie)]

[libvarnishapi3]Fixed
Source package: [varnish]
Details (5)
- 7.7.0-3+deb13u1 · amd64 · trixie
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u1 · arm64 · trixie
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u2 · amd64 · trixie-security
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
[libvarnishapi-dev]Fixed
Source package: [varnish]
Details (5)
- 7.7.0-3+deb13u1 · amd64 · trixie
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u1 · arm64 · trixie
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u2 · amd64 · trixie-security
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
[varnish]Fixed
Details (5)
- 7.7.0-3+deb13u1 · amd64 · trixie
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u1 · arm64 · trixie
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u2 · amd64 · trixie-security
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
[varnish-doc]Fixed
Source package: [varnish]
Details (5)
- 7.7.0-3+deb13u1 · all · trixie
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u1 · all · trixie
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u1 · all · trixie-security
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u1 · all · trixie-security · Historical version
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13
- 7.7.0-3+deb13u2 · all · trixie-security
  Fixed · Fixed: 7.7.0-3+deb13u1
  nvd · varnish · debian · 13

Observed: Oct 27, 2026, 7:34:03 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]