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CVE-2026-101337

CVE-2026-101337 · Stack overwrite from specially formatted base64 RDATA field

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

When base64 data is split up in pieces, of 3 character or less, tokens were incorrectly calculated to produce 0 bytes. This enables attackers to overwrite the stack with up to 64K of attacker controlled data. Zone files which are written out by NSD itself, such as for zones for which the NSD instance is secondary, will not be formatted like this. The zone file must be fed to NSD directly, (but it could come, for example, from an operator controlled provisioning system).

CVSS 8.7 · High · EPSS 0.3% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • nsd

    Versions
    • ≥ 4.10.0, < 4.15.3: Affected (semver)

    Update to 4.15.3

  • nsd Debian:12

    Versions
    • 4.10.1-1
    • 4.10.1~rc2-1
    • 4.10.1~rc2-2
    • 4.11.0-1
    • 4.11.1-1
    • 4.12.0-1
    • 4.12.0-2
    • 4.13.0-1
    • 4.13.0-2
    • 4.13.0-3
    • 4.13.0-4
    • 4.13.0-5
    • 4.13.0-6
    • 4.14.0-1
    • 4.14.1-1
    • 4.14.2-1
    • 4.14.3-1
    • 4.15.0-1
    • 4.15.0~rc1-1
    • 4.15.1-1
    • 4.15.2-1
    • 4.15.3-1
    • 4.15.4-1
    • 4.6.1-1
    • 4.7.0-1
    • 4.8.0-1
    • 4.9.1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nsd Debian:13

    Versions
    • 4.12.0-1
    • 4.12.0-2
    • 4.13.0-1
    • 4.13.0-2
    • 4.13.0-3
    • 4.13.0-4
    • 4.13.0-5
    • 4.13.0-6
    • 4.14.0-1
    • 4.14.1-1
    • 4.14.2-1
    • 4.14.3-1
    • 4.15.0-1
    • 4.15.0~rc1-1
    • 4.15.1-1
    • 4.15.2-1
    • 4.15.3-1
    • 4.15.4-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nsd Debian:14

    Versions
    • 4.12.0-1
    • 4.12.0-2
    • 4.13.0-1
    • 4.13.0-2
    • 4.13.0-3
    • 4.13.0-4
    • 4.13.0-5
    • 4.13.0-6
    • 4.14.0-1
    • 4.14.1-1
    • 4.14.2-1
    • 4.14.3-1
    • 4.15.0-1
    • 4.15.0~rc1-1
    • 4.15.1-1
    • 4.15.2-1
    Affected ranges
    • ECOSYSTEM: < 4.15.3-1

    Update to 4.15.3-1

  • nsd Ubuntu:Pro:16.04:LTS

    Versions
    • 4.1.2-1
    • 4.1.6-1
    • 4.1.7-1
    • 4.1.7-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nsd Ubuntu:Pro:18.04:LTS

    Versions
    • 4.1.16-1build1
    • 4.1.17-1
    • 4.1.17-1build1
    • 4.1.17-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nsd Ubuntu:Pro:20.04:LTS

    Versions
    • 4.1.26-1
    • 4.1.26-1build1
    • 4.1.26-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nsd Ubuntu:Pro:22.04:LTS

    Versions
    • 4.3.5-1
    • 4.3.7-1
    • 4.3.8-1
    • 4.3.8-1build1
    • 4.3.9-1
    • 4.3.9-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nsd Ubuntu:Pro:24.04:LTS

    Versions
    • 4.7.0-1
    • 4.8.0-1
    • 4.8.0-1build1
    • 4.8.0-1build3
    • 4.8.0-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nsd Ubuntu:26.10

    Versions
    • 4.14.0-1
    • 4.14.2-1
    • 4.14.3-1
    • 4.15.0-1
    • 4.15.0-1build1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • nsd Ubuntu:Pro:26.04:LTS

    Versions
    • 4.12.0-1
    • 4.13.0-6
    • 4.14.0-1
    • 4.14.0-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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