CVE-2026-34475
9.8
CRITICAL
CVSS 3.1
EPSS 0.07%
Description
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.
How to fix CVE-2026-34475
No fixed version has been published yet. Mitigate by removing the affected package or applying upstream guidance from the references below.
- Debian/varnish—no fix listed
Is CVE-2026-34475 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |