# CVE-2026-34475: Varnish Cache before 8.0.1 and Varnish Enterprise before 6.0.16r12, in certain unchecked req.url scenarios, mishandle…

Source: https://junglewise.ai/threats/cve-2026-34475-varnish-cache-before-8-0-1-and-varnish-enterprise-before-6-0  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-03-27  
License: CC BY 4.0 with a link back

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.

Technologies: [Varnish-Software Varnish Enterprise](https://junglewise.ai/threats/technologies/varnish-enterprise), [Vinyl-Cache Vinyl Cache](https://junglewise.ai/threats/technologies/vinyl-cache). Vendors: [Varnish-Software](https://junglewise.ai/threats/vendors/varnish-software), [Vinyl-Cache](https://junglewise.ai/threats/vendors/vinyl-cache).

## Quick answers

**Is CVE-2026-34475 exploited in the wild?** 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.

## Affected products

- Varnish-Software Varnish Enterprise
- Vinyl-Cache Vinyl Cache

## Related threats

- [Varnish Cache workspace overflow denial of service in HTTP/1 pipelining](https://junglewise.ai/threats/cve-2026-40396-varnish-cache-workspace-overflow-denial-of-service-in-http-1)