p PatchFirst

CVE-2026-52686

CVE-2026-52686 · Wildcard CNAME proof validation bypass

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

The issue is a DNSSEC validation bypass where wildcard expansion proofs (NSEC/NSEC3 records) are accepted without signature validation when the wildcard answer is a CNAME or DNAME record.

CVSS 3.7 · Low · EPSS 0.2% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • recursor

    Versions
    • ≥ 5.2.0, < 5.2.12: Affected (semver)
    • ≥ 5.3.0, < 5.3.9: Affected (semver)
    • ≥ 5.4.0, < 5.4.4: Affected (semver)

    Update to 5.2.12; Update to 5.3.9; Update to 5.4.4

  • pdns-recursor Debian:12

    Versions
    • 4.8.4-1
    • 4.8.6-1
    • 4.8.7-1
    • 4.8.8-1
    • 4.8.8-1+deb12u1
    • 4.9.0-1
    • 4.9.0-2
    • 4.9.1-1
    • 4.9.1-2
    • 4.9.1-3
    • 4.9.1-4
    • 4.9.2-1
    • 4.9.2-2
    • 4.9.3-1
    • 4.9.4-1
    • 4.9.5-1
    • 5.0.5-1
    • 5.0.7-1
    • 5.0.7-2
    • 5.0.9-1
    • 5.1.3-1
    • 5.1.3-2
    • 5.2.0-1
    • 5.2.0-2
    • 5.2.0-3
    • 5.2.0-4
    • 5.2.0-5
    • 5.2.1-1
    • 5.2.2-1
    • 5.2.2-2
    • 5.2.4-1
    • 5.2.4-2
    • 5.2.5-1
    • 5.3.0-1
    • 5.3.0-2
    • 5.3.0-3
    • 5.3.0-4
    • 5.3.0-5
    • 5.3.1-1
    • 5.3.3-1
    • 5.3.4-1
    • 5.3.4-2
    • 5.3.5-1
    • 5.4.0-1
    • 5.4.1-1
    • 5.4.1-2
    • 5.4.2-1
    • 5.4.2-2
    • 5.4.3-1
    • 5.4.4-1
    • 5.4.5-1
    • 5.4.6-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pdns-recursor Debian:13

    Versions
    • 5.2.11-0+deb13u1
    • 5.2.4-2
    • 5.2.4-2+deb13u1
    • 5.2.5-1
    • 5.2.6-0+deb13u1
    • 5.2.7-0+deb13u1
    • 5.2.8-0+deb13u1
    • 5.2.9-0+deb13u1
    Affected ranges
    • ECOSYSTEM: < 5.2.12-0+deb13u1

    Update to 5.2.12-0+deb13u1

  • pdns-recursor Debian:14

    Versions
    • 5.2.4-2
    • 5.2.5-1
    • 5.3.0-1
    • 5.3.0-2
    • 5.3.0-3
    • 5.3.0-4
    • 5.3.0-5
    • 5.3.1-1
    • 5.3.3-1
    • 5.3.4-1
    • 5.3.4-2
    • 5.3.5-1
    • 5.4.0-1
    • 5.4.1-1
    • 5.4.1-2
    • 5.4.2-1
    • 5.4.2-2
    • 5.4.3-1
    Affected ranges
    • ECOSYSTEM: < 5.4.4-1

    Update to 5.4.4-1

  • pdns-recursor Ubuntu:Pro:16.04:LTS

    Versions
    • 3.7.3-1
    • 4.0.0~alpha1-1
    • 4.0.0~alpha1-2
    • 4.0.0~alpha2-2
    • 4.0.0~alpha2-2ubuntu0.1
    • 4.0.0~alpha2-2ubuntu0.1+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pdns-recursor Ubuntu:Pro:18.04:LTS

    Versions
    • 4.0.6-1
    • 4.0.6-1build1
    • 4.0.7-1
    • 4.1.1-1
    • 4.1.1-1build1
    • 4.1.1-2
    • 4.1.1-2ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pdns-recursor Ubuntu:Pro:20.04:LTS

    Versions
    • 4.2.0-6
    • 4.2.1-1
    • 4.2.1-1build1
    • 4.2.1-1build2
    • 4.2.1-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pdns-recursor Ubuntu:Pro:22.04:LTS

    Versions
    • 4.4.2-3
    • 4.6.0-1ubuntu1
    • 4.6.0-1ubuntu1+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pdns-recursor Ubuntu:24.04:LTS

    Versions
    • 4.9.0-2
    • 4.9.1-4
    • 4.9.2-1
    • 4.9.2-1build1
    • 4.9.2-2
    • 4.9.3-1
    • 4.9.3-1build2
    • 4.9.3-1build3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pdns-recursor Ubuntu:26.10

    Versions
    • 5.3.5-1
    • 5.4.3-1
    • 5.4.5-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • pdns-recursor Ubuntu:26.04:LTS

    Versions
    • 5.2.4-2build2
    • 5.3.1-1
    • 5.3.3-1
    • 5.3.4-1
    • 5.3.4-1build1
    • 5.3.4-2
    • 5.3.5-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

Check your server →