2.3
Low
CVE-2026-50052 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…
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 products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| Vinyl Cache | 9.0.0 | 9.0.1 |
| Varnish Cache (pre split) 8.0 | earliest → < 8.0.2 | 8.0.2 |
| Varnish Cache (pre split) 7.6 | 7.6.0 → 8.0.1 | No fix stated |
| Varnish Cache (pre split) 6.0 | 6.0.14 → 6.0.17 | 6.0.18 |
| Varnish Cache by Varnish Software 9.0 | 9.0.0 → 9.0.2 | 9.0.3 |