CVE-2026-50052

unknown

Published 2026-06-03 · Modified 2026-06-03

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CVSS v3

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CVSS v4 NEW

2.3

CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N/S:N/AU:N/R:A/V:D/RE:L/U:Green

VIR risk

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Description

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.

Predictions

Exploit likelihood

20%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

Mitigation details

Source: Debian Security Tracker · View original ↗ · DFSG

CVE-2026-50052 NameCVE-2026-50052 DescriptionVSV00019 SourceCVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) ReferencesDSA-6303-1 Vulnerable and fixed packages The table below lists information on source packages. Source PackageReleaseVersionStatus varnish (PTS)bullseye6.5.1-1+deb11u3fixed…

CVE-2026-50052

Name	CVE-2026-50052
Description	VSV00019
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-6303-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
varnish (PTS)	bullseye	6.5.1-1+deb11u3	fixed
	bullseye (security)	6.5.1-1+deb11u5	fixed
	bookworm, bookworm (security)	7.1.1-2+deb12u1	fixed
	trixie	7.7.0-3	vulnerable
	trixie (security)	7.7.0-3+deb13u1	fixed
	forky, sid	7.7.3-2	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
varnish	source	bullseye	(not affected)
varnish	source	bookworm	(not affected)
varnish	source	trixie	7.7.0-3+deb13u1	DSA-6303-1
varnish	source	(unstable)	(unfixed)

Notes

[bookworm] - varnish <not-affected> (Vulnerable code not present, introduced in 7.6)
[bullseye] - varnish <not-affected> (Vulnerable code not present, introduced in 7.6)
https://vinyl-cache.org/security/VSV00019.html
https://code.vinyl-cache.org/vinyl-cache/vinyl-cache/commit/dfc27fb4e7bf110945f5c145ce95b8de14ead77f (master)
https://code.vinyl-cache.org/vinyl-cache/vinyl-cache/commit/037031d429e3d309ae66ebabff33aa591402f20e (6.0)

Home - Debian Security - Source (Git)

Apply commands

text fix

Notes

[bookworm] - varnish <not-affected> (Vulnerable code not present, introduced in 7.6)[bullseye] - varnish <not-affected> (Vulnerable code not present, introduced in 7.6)https://vinyl-cache.org/security/VSV00019.htmlhttps://code.vinyl-cache.org/vinyl-cache/vinyl-cache/commit/dfc27fb4e7bf110945f5c145ce95b8de14ead77f (master)https://code.vinyl-cache.org/vinyl-cache/vinyl-cache/commit/037031d429e3d309ae66ebabff33aa591402f20e (6.0)

OS impact

Debian Mixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`7.7.0-3+deb13u1`
sid	Affected	—
forky	Affected	—
bullseye	Fixed	`0`
bookworm	Fixed	`0`

References

CWEs

CWE-444

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.