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Vulnerabilities

Vulnerability · CVE-2026-34475

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 l…

Published Mar 27, 2026 · catalog updated Jun 17, 2026 · varnish enterprise

Check if you run it

No confirmed exploitation is on record for CVE-2026-34475. EPSS is 0.37%. Act only if a listed version of varnish enterprise is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.37%
Remediation
Advisory link
Affected products
cpe varnish-software/varnish enterprise · cpe vinyl-cache/vinyl cache

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe varnish-software/varnish enterprise6.0.16
  • cpe vinyl-cache/vinyl cacheversion unspecified

How to fix CVE-2026-34475

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-34475. EPSS is 0.37%. Act only if a listed version of varnish enterprise is installed.

Which versions are affected?

Compare what you have installed with varnish-software/varnish enterprise 6.0.16. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-180. EPSS 0.37%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Mar 27, 2026 · NIST NVD

    Detected

    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.

  2. Jun 17, 2026 · NIST NVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2026-34475

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-34475

    30-day exploitation probability 0.4%

    first.org
  • NIST NVDVulnerability recordCVE-2026-34475

    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.

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.