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CVE-2026-50052

LOW
2.3
CVSS Score
Published: June 3, 2026 at 03:56 AM UTC
Updated: July 22, 2026 at 07:24 PM UTC
3 products affected across 2 vendorsVarnish CacheVinyl CacheVarnish Cache

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Severity
LOW2.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Varnish Cache· Varnish Software
60%
9.0.0 ≤ v ≤ 9.0.29.0.0
Vendor states this is fixed in 9.0.3 (unaffected)
Vinyl Cache· Vinyl Cache
60%
9.0.0
Vendor states this is fixed in 9.0.1 (unaffected)
Varnish Cache· Vinyl Cache
50%
6.0.14 ≤ v ≤ 6.0.177.6.0 ≤ v ≤ 8.0.16.0.147.6.0
Vendor states this is fixed in 6.0.18 (unaffected)
Vendor states this is fixed in 8.0.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

Source: cverecord
https://vinyl-cache.org/security/VSV00019.html
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2026/07/01/9

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

2.3LOWmitre
Vector?

Quick Info

StatusAWAITING ANALYSIS
CWE
CWE-444

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