CVE-2026-34475: Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle…
CVE-2026-34475 · Severity: medium · CVSS 5.4 · Published 2026-03-27
Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle URLs with a path of / for HTTP/1.1, potentially leading to cache poisoning or authentication bypass.
No. Junglewise Threat Intelligence has no report of CVE-2026-34475 being exploited in the wild.
How severe is CVE-2026-34475?
Medium severity, with a CVSS score of 5.4, published 27 March 2026.
Which products and versions are affected?
Varnish-Software Varnish Enterprise, Vinyl-Cache Vinyl Cache. The advisory does not name versions.
Is there a fix for CVE-2026-34475?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-34475?
Check whether you run Varnish-Software Varnish Enterprise or Vinyl-Cache Vinyl Cache. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.