CVE-2026-50052: CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') in The Vinyl Cache Project Vinyl Cache
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.
CVE-2026-50052: CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') in The Vinyl Cache Project Vinyl Cache
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.
CVSS v4.0
Score 2.3low
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-06-03T03:56:01.075Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1fbcb1e29bf47b50708570
Added to database: 6/3/2026, 5:33:37 AM
Last updated: 6/3/2026, 5:34:10 AM
Views: 1
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