Is CVE-2026-34475 in the CISA KEV catalog?

No. CVE-2026-34475 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-34475?

CVE-2026-34475 has a CVSS v3 base score of 5.4 (MEDIUM).

What is the EPSS score for CVE-2026-34475?

CVE-2026-34475 has an EPSS score of 0.20% (10th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-34475?

Upgrade vinyl cache to 8.0.1 or later.

CVE & CISA-KEV Catalog

CVE-2026-34475

MEDIUM

5.4

CVSS v3

NVD

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.

CWE-180

How to fix

Remediation Available

vinyl cacheNVD

Affected:< 8.0.1Fixed in:8.0.1CVE-2026-34475derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N

Exploit Intelligence

0.20%probability of exploitation in 30 days

10thpercentile

Low risk: more likely to be exploited than 10% of all known CVEs.

References

Vendor Advisory1

vinyl-cache.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-04-22.