Vulnerability 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.
Related Weaknesses (CWE)
References
- https://vinyl-cache.org/security/VSV00019.html
- http://www.openwall.com/lists/oss-security/2026/07/01/9
FAQ
What is CVE-2026-50052?
CVE-2026-50052 is a documented vulnerability. 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 ...
How severe is CVE-2026-50052?
CVSS scoring is not yet available for CVE-2026-50052. Check NVD for updates.
Is there a patch for CVE-2026-50052?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.