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    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 leading to cache poisoning or authentication bypass.

    Published:Mar 27, 2026
    Last Modified:Apr 22, 2026
    EPS:Mar 27, 2026
    EPSS Score:0.00046
    CVSS Score:5.4

    Affected Products

    Vendor
    Varnish-software
    Product
    Varnish Cache
    Vendor
    Varnish-software
    Product
    Varnish Enterprise
    Vendor
    Vinyl-cache
    Product
    Vinyl Cache

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2022-45060 (CVSS 7.5) — An HTTP Request Forgery issue was discovered in Varnish Cache 5.x and 6.x before 6.0.11, 7.x before 7.1.2, and…
    CVE-2022-23959 (CVSS 9.1) — In Varnish Cache before 6.6.2 and 7.x before 7.0.2, Varnish Cache 6.0 LTS before 6.0.10, and and Varnish Enter…
    CVE-2021-36740 (CVSS 6.5) — Varnish Cache, with HTTP/2 enabled, allows request smuggling and VCL authorization bypass via a large Content-…
    CVE-2020-11653 (CVSS 7.5) — An issue was discovered in Varnish Cache before 6.0.6 LTS, 6.1.x and 6.2.x before 6.2.3, and 6.3.x before 6.3.…
    CVE-2019-20637 (CVSS 7.5) — An issue was discovered in Varnish Cache before 6.0.5 LTS, 6.1.x and 6.2.x before 6.2.2, and 6.3.x before 6.3.…
    CVE-2019-15892 (CVSS 7.5) — An issue was discovered in Varnish Cache before 6.0.4 LTS, and 6.1.x and 6.2.x before 6.2.1. An HTTP/1 parsing…
    CVE-2017-12425 (CVSS 7.5) — An issue was discovered in Varnish HTTP Cache 4.0.1 through 4.0.4, 4.1.0 through 4.1.7, 5.0.0, and 5.1.0 throu…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High