p PatchFirst

CVE-2026-93894

CVE-2026-93894

This page contains facts from public vulnerability sources. Check the original advisory before updating.

In Vinyl Cache before 9.0,2, workspace buffer overflow vulnerability was found in the .upper() and .lower() string type methods of VCL. This can be used as a remote denial of service (DoS) vector to make the child process segfault or assert, and then restart. Effectively exploiting this vulnerability requires prior knowledge about the VCL in use and the ability to craft a request that contains a string that is long enough to fill the remaining workspace at the call site while staying under the different request size limits (http_req_size, http_req_hdr_len, etc.).

CVSS 2.3 · Low · EPSS 0.4% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • vinyl cache

    Versions
    • ≥ 0, < 9.0.2: Affected (semver)
    • ≥ 0, < 90f5bacc14b2404e6cc349ba015f0f73b8515136: Affected (git)

    No fix published

  • varnish cache

    Versions
    • ≥ 9.0.0, < 9.0.4: Affected (semver)
    • ≥ 0, < c5078ae575201b05ae8674a90ddb19ffe7f4b439: Affected (git)
    • ≥ 6.3.0, ≤ 8.0.2: Affected (semver)

    Update to 9.0.4

  • varnish Debian:12

    Versions
    • 7.1.1-1.1
    • 7.1.1-1.1+deb12u1
    • 7.1.1-1.2
    • 7.1.1-2+deb12u1
    • 7.5.0-1
    • 7.5.0-2
    • 7.5.0-3
    • 7.6.0-1
    • 7.6.0-2
    • 7.6.1-1
    • 7.6.1-2
    • 7.7.0-1
    • 7.7.0-2
    • 7.7.0-3
    • 7.7.1-1
    • 7.7.2-1
    • 7.7.2-2
    • 7.7.3-1
    • 7.7.3-2
    • 7.7.3-3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • varnish Debian:13

    Versions
    • 7.7.0-3
    • 7.7.0-3+deb13u1
    Affected ranges
    • ECOSYSTEM: < 7.7.0-3+deb13u2

    Update to 7.7.0-3+deb13u2

  • vinyl-cache Debian:14

    Versions
    • 9.0.0+20260429-2
    • 9.0.0+20260429-3
    • 9.0.1-1
    • 9.0.1-2
    • 9.0.1-3
    • 9.0.1-4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • varnish Ubuntu:14.04:LTS

    Versions
    • 3.0.4-1ubuntu1
    • 3.0.4-1ubuntu2
    • 3.0.5-1ubuntu2
    • 3.0.5-2
    • 3.0.5-2ubuntu0.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • varnish Ubuntu:Pro:16.04:LTS

    Versions
    • 4.0.3-1
    • 4.1.0-1
    • 4.1.0-2
    • 4.1.1-1
    • 4.1.1-1ubuntu0.2
    • 4.1.1-1ubuntu0.2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • varnish Ubuntu:Pro:18.04:LTS

    Versions
    • 5.0.0-7.1
    • 5.2.1-1
    • 5.2.1-1ubuntu0.1
    • 5.2.1-1ubuntu0.1+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • varnish Ubuntu:Pro:20.04:LTS

    Versions
    • 6.1.1-1
    • 6.2.1-2
    • 6.2.1-2ubuntu0.1~esm1
    • 6.2.1-2ubuntu0.1~esm2
    • 6.2.1-2ubuntu0.1
    • 6.2.1-2ubuntu0.2
    • 6.2.1-2ubuntu0.2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • varnish Ubuntu:Pro:22.04:LTS

    Versions
    • 6.5.2-1
    • 6.6.1-1
    • 6.6.1-1ubuntu0.2
    • 6.6.1-1ubuntu0.2+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • varnish Ubuntu:24.04:LTS

    Versions
    • 7.1.1-1.1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • varnish Ubuntu:26.10

    Versions
    • 7.7.3-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • vinyl-cache Ubuntu:26.10

    Versions
    • 9.0.1-4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • varnish Ubuntu:26.04:LTS

    Versions
    • 7.7.3-1
    • 7.7.3-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

Check your server →