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.
Published: 2026-03-27
Score: 5.4 Medium
EPSS: < 1% Very Low
KEV: No
Impact: Authentication bypass and cache poisoning
Action: Immediate Patch
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Wed, 22 Apr 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Varnish-software varnish Enterprise
Vinyl-cache
Vinyl-cache vinyl Cache
CPEs cpe:2.3:a:varnish-software:varnish_enterprise:*:*:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r10:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r11:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r1:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r2:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r3:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r4:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r5:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r6:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r7:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r8:*:*:*:*:*:*
cpe:2.3:a:varnish-software:varnish_enterprise:6.0.16:r9:*:*:*:*:*:*
cpe:2.3:a:vinyl-cache:vinyl_cache:*:*:*:*:*:*:*:*
Vendors & Products Varnish-software varnish Enterprise
Vinyl-cache
Vinyl-cache vinyl Cache

Thu, 02 Apr 2026 00:15:00 +0000

Type Values Removed Values Added
Title Varnish Cache URL Handling Leading to Cache Poisoning and Authentication Bypass Varnish Cache: Varnish Cache and Varnish Enterprise: Cache poisoning and authentication bypass via unchecked URL handling
Weaknesses CWE-1286
References
Metrics threat_severity

None

threat_severity

Moderate


Sun, 29 Mar 2026 20:45:00 +0000

Type Values Removed Values Added
Title Varnish Cache URL Handling Leading to Cache Poisoning and Authentication Bypass

Fri, 27 Mar 2026 20:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 27 Mar 2026 20:00:00 +0000

Type Values Removed Values Added
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.
First Time appeared Varnish-software
Varnish-software varnish Cache
Weaknesses CWE-180
CPEs cpe:2.3:a:varnish-software:varnish_cache:*:*:*:*:*:*:*:*
Vendors & Products Varnish-software
Varnish-software varnish Cache
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N'}


Subscriptions

Varnish-software Varnish Cache Varnish Enterprise
Vinyl-cache Vinyl Cache
cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published:

Updated: 2026-03-27T20:01:11.327Z

Reserved: 2026-03-27T19:40:27.986Z

Link: CVE-2026-34475

cve-icon Vulnrichment

Updated: 2026-03-27T20:01:02.764Z

cve-icon NVD

Status : Analyzed

Published: 2026-03-27T20:16:36.390

Modified: 2026-04-22T19:40:02.797

Link: CVE-2026-34475

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-03-27T19:40:28Z

Links: CVE-2026-34475 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-04-02T07:55:25Z

Weaknesses