CVE-2026-50052
LowCVSS 2.3Exploitation Probability (EPSS)
Low risk27th percentile - higher than 27% of all known CVEs
Summary
In Vinyl Cache before 9.0.1 and Varnish Cache before 9.0.3, a deficiency in HTTP/2 request parsing can be exploited for backend request desync (request smuggling), leading to cache poisoning, authentication bypass, or information disclosure. The attack only works if HTTP/2 is enabled (disabled by default).
Risk Assessment
An attacker can remotely manipulate HTTP/2 traffic, potentially leading to cache poisoning, authentication bypass, or data disclosure.
Recommendation
Update Vinyl Cache to version 9.0.1 or later, and Varnish Cache to version 9.0.3 or later. If HTTP/2 is not required, keep it disabled.
Original NVD description (English source)
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.