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CVE-2026-92543

CVE-2026-92543 · Docker Engine insecure-registry fallback via malicious DNS responses

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

Docker Engine classifies a registry hostname as insecure using an any-match DNS check. loadInsecureRegistries() injects 127.0.0.0/8 and ::1/128 as insecure CIDRs by default. isCIDRMatch resolves all of the hostname's addresses and returns true if a single address is in the insecure CIDR list. Because the transport re-dials the hostname rather than the CIDR-matching address, a DNS answer set of one loopback IP plus a non-loopback attacker IP disables certificate verification and enables HTTP fallback for the registry connection.

CVSS 7.6 · High · EPSS 0.1% · Fix available

Published
Updated

Stack: system · containers

Affected products and versions

  • docker engine

    Versions
    • ≥ 0, < 29.8.2: Affected (semver)

    Update to 29.8.2

  • docker engine

    Versions
    • ≥ 0, < v2.0.0-beta.25: Affected (semver)

    Update to v2.0.0-beta.25

  • docker.io Debian:12

    Versions
    • 20.10.24+dfsg1-1
    • 20.10.24+dfsg1-1+deb12u1
    • 20.10.25+dfsg1-1
    • 20.10.25+dfsg1-2
    • 20.10.25+dfsg1-3
    • 20.10.25+dfsg1-4
    • 26.1.4+dfsg1-1
    • 26.1.4+dfsg1-2
    • 26.1.4+dfsg1-3
    • 26.1.4+dfsg1-4
    • 26.1.4+dfsg1-5
    • 26.1.4+dfsg1-6
    • 26.1.4+dfsg1-7
    • 26.1.4+dfsg1-8
    • 26.1.4+dfsg1-9
    • 26.1.4+dfsg2-1
    • 26.1.4+dfsg3-1
    • 26.1.5+dfsg1-1
    • 26.1.5+dfsg1-10
    • 26.1.5+dfsg1-2
    • 26.1.5+dfsg1-3
    • 26.1.5+dfsg1-4
    • 26.1.5+dfsg1-5
    • 26.1.5+dfsg1-6
    • 26.1.5+dfsg1-7
    • 26.1.5+dfsg1-8
    • 26.1.5+dfsg1-9
    • 27.5.1+dfsg1-1
    • 27.5.1+dfsg1-2
    • 27.5.1+dfsg2-1
    • 27.5.1+dfsg3-1
    • 27.5.1+dfsg3-2
    • 27.5.1+dfsg3-3
    • 27.5.1+dfsg3-4
    • 27.5.1+dfsg3-5
    • 27.5.1+dfsg3-6
    • 27.5.1+dfsg4-1
    • 27.5.1+dfsg4-2
    • 28.5.2+dfsg1-1
    • 28.5.2+dfsg2-1
    • 28.5.2+dfsg3-1
    • 28.5.2+dfsg3-2
    • 28.5.2+dfsg4-1
    • 28.5.2+dfsg4-2
    • 28.5.2+dfsg4-3
    • 28.5.2+dfsg4-4
    • 28.5.2+dfsg4-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io Debian:13

    Versions
    • 26.1.5+dfsg1-10
    • 26.1.5+dfsg1-9
    • 26.1.5+dfsg1-9+deb13u1
    • 27.5.1+dfsg1-1
    • 27.5.1+dfsg1-2
    • 27.5.1+dfsg2-1
    • 27.5.1+dfsg3-1
    • 27.5.1+dfsg3-2
    • 27.5.1+dfsg3-3
    • 27.5.1+dfsg3-4
    • 27.5.1+dfsg3-5
    • 27.5.1+dfsg3-6
    • 27.5.1+dfsg4-1
    • 27.5.1+dfsg4-2
    • 28.5.2+dfsg1-1
    • 28.5.2+dfsg2-1
    • 28.5.2+dfsg3-1
    • 28.5.2+dfsg3-2
    • 28.5.2+dfsg4-1
    • 28.5.2+dfsg4-2
    • 28.5.2+dfsg4-3
    • 28.5.2+dfsg4-4
    • 28.5.2+dfsg4-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io Debian:14

    Versions
    • 26.1.5+dfsg1-10
    • 26.1.5+dfsg1-9
    • 27.5.1+dfsg1-1
    • 27.5.1+dfsg1-2
    • 27.5.1+dfsg2-1
    • 27.5.1+dfsg3-1
    • 27.5.1+dfsg3-2
    • 27.5.1+dfsg3-3
    • 27.5.1+dfsg3-4
    • 27.5.1+dfsg3-5
    • 27.5.1+dfsg3-6
    • 27.5.1+dfsg4-1
    • 27.5.1+dfsg4-2
    • 28.5.2+dfsg1-1
    • 28.5.2+dfsg2-1
    • 28.5.2+dfsg3-1
    • 28.5.2+dfsg3-2
    • 28.5.2+dfsg4-1
    • 28.5.2+dfsg4-2
    • 28.5.2+dfsg4-3
    • 28.5.2+dfsg4-4
    • 28.5.2+dfsg4-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io Ubuntu:Pro:16.04:LTS

    Versions
    • 1.6.2~dfsg1-1ubuntu4
    • 1.10.2-0ubuntu3
    • 1.10.2-0ubuntu4
    • 1.10.3-0ubuntu1
    • 1.10.3-0ubuntu4
    • 1.10.3-0ubuntu5
    • 1.10.3-0ubuntu6
    • 1.11.2-0ubuntu5~16.04
    • 1.12.1-0ubuntu13~16.04.1
    • 1.12.3-0ubuntu4~16.04.2
    • 1.12.6-0ubuntu1~16.04.1
    • 1.13.1-0ubuntu1~16.04.2
    • 17.03.2-0ubuntu2~16.04.1
    • 18.06.1-0ubuntu1~16.04.2
    • 18.06.1-0ubuntu1.2~16.04.1
    • 18.09.2-0ubuntu1~16.04.1
    • 18.09.5-0ubuntu1~16.04.2
    • 18.09.7-0ubuntu1~16.04.1
    • 18.09.7-0ubuntu1~16.04.4
    • 18.09.7-0ubuntu1~16.04.5
    • 18.09.7-0ubuntu1~16.04.6
    • 18.09.7-0ubuntu1~16.04.7
    • 18.09.7-0ubuntu1~16.04.9+esm1
    • 18.09.7-0ubuntu1~16.04.9+esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io Ubuntu:Pro:18.04:LTS

    Versions
    • 1.13.1-0ubuntu6
    • 17.03.2-0ubuntu1
    • 17.03.2-0ubuntu3
    • 17.03.2-0ubuntu5
    • 17.12.1-0ubuntu1
    • 18.06.1-0ubuntu1~18.04.1
    • 18.06.1-0ubuntu1.2~18.04.1
    • 18.09.2-0ubuntu1~18.04.1
    • 18.09.5-0ubuntu1~18.04.2
    • 18.09.7-0ubuntu1~18.04.1
    • 18.09.7-0ubuntu1~18.04.3
    • 18.09.7-0ubuntu1~18.04.4
    • 19.03.6-0ubuntu1~18.04.1
    • 19.03.6-0ubuntu1~18.04.2
    • 19.03.6-0ubuntu1~18.04.3
    • 20.10.2-0ubuntu1~18.04.2
    • 20.10.2-0ubuntu1~18.04.3
    • 20.10.7-0ubuntu1~18.04.1
    • 20.10.7-0ubuntu1~18.04.2
    • 20.10.7-0ubuntu5~18.04.2
    • 20.10.7-0ubuntu5~18.04.3
    • 20.10.12-0ubuntu2~18.04.1
    • 20.10.21-0ubuntu1~18.04.2
    • 20.10.21-0ubuntu1~18.04.3
    • 20.10.21-0ubuntu1~18.04.3+esm1
    • 20.10.21-0ubuntu1~18.04.3+esm2
    • 20.10.21-0ubuntu1~18.04.3+esm3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io Ubuntu:Pro:20.04:LTS

    Versions
    • 19.03.2-0ubuntu1
    • 19.03.6-0ubuntu1
    • 19.03.8-0ubuntu1
    • 19.03.8-0ubuntu1.20.04
    • 19.03.8-0ubuntu1.20.04.1
    • 19.03.8-0ubuntu1.20.04.2
    • 20.10.2-0ubuntu1~20.04.2
    • 20.10.2-0ubuntu1~20.04.3
    • 20.10.7-0ubuntu1~20.04.1
    • 20.10.7-0ubuntu1~20.04.2
    • 20.10.7-0ubuntu5~20.04.1
    • 20.10.7-0ubuntu5~20.04.2
    • 20.10.12-0ubuntu2~20.04.1
    • 20.10.21-0ubuntu1~20.04.1
    • 20.10.21-0ubuntu1~20.04.2
    • 20.10.21-0ubuntu1~20.04.4
    • 20.10.21-0ubuntu1~20.04.5
    • 20.10.21-0ubuntu1~20.04.6
    • 20.10.21-0ubuntu1~20.04.6+esm1
    • 20.10.21-0ubuntu1~20.04.6+esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io-app Ubuntu:Pro:20.04:LTS

    Versions
    • 20.10.25-0ubuntu1~20.04.1
    • 20.10.25-0ubuntu1~20.04.2
    • 24.0.5-0ubuntu1~20.04.1
    • 24.0.7-0ubuntu2~20.04.1
    • 26.1.3-0ubuntu1~20.04.1
    • 26.1.3-0ubuntu1~20.04.1+esm1
    • 26.1.3-0ubuntu1~20.04.1+esm2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io Ubuntu:Pro:22.04:LTS

    Versions
    • 20.10.7-0ubuntu5
    • 20.10.7-0ubuntu7
    • 20.10.12-0ubuntu1
    • 20.10.12-0ubuntu2
    • 20.10.12-0ubuntu3
    • 20.10.12-0ubuntu3+gke1.24.1
    • 20.10.12-0ubuntu4
    • 20.10.21-0ubuntu1~22.04.2
    • 20.10.21-0ubuntu1~22.04.3
    • 20.10.21-0ubuntu1~22.04.5
    • 20.10.21-0ubuntu1~22.04.6
    • 20.10.21-0ubuntu1~22.04.7
    • 20.10.21-0ubuntu1~22.04.7+esm1
    • 20.10.21-0ubuntu1~22.04.7+esm2
    • 20.10.21-0ubuntu1~22.04.8
    • 20.10.21-0ubuntu1~22.04.8+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io-app Ubuntu:Pro:22.04:LTS

    Versions
    • 20.10.25-0ubuntu1~22.04.1
    • 20.10.25-0ubuntu1~22.04.2
    • 24.0.5-0ubuntu1~22.04.1
    • 24.0.7-0ubuntu2~22.04.1
    • 26.1.3-0ubuntu1~22.04.1
    • 26.1.3-0ubuntu1~22.04.1+esm1
    • 27.5.1-0ubuntu3~22.04.1
    • 27.5.1-0ubuntu3~22.04.2
    • 28.2.2-0ubuntu1~22.04.1
    • 29.1.3-0ubuntu3~22.04.1
    • 29.1.3-0ubuntu3~22.04.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io Ubuntu:Pro:24.04:LTS

    Versions
    • 20.10.24+dfsg1-1ubuntu2
    • 20.10.25+dfsg1-2ubuntu1
    • 20.10.25+dfsg1-2ubuntu1+esm1
    • 20.10.25+dfsg1-2ubuntu1+esm2
    • 20.10.25+dfsg1-2ubuntu1.24.04.1
    • 20.10.25+dfsg1-2ubuntu1.24.04.1+esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io-app Ubuntu:Pro:24.04:LTS

    Versions
    • 24.0.5-0ubuntu1
    • 24.0.7-0ubuntu1
    • 24.0.7-0ubuntu2
    • 24.0.7-0ubuntu3
    • 24.0.7-0ubuntu4
    • 24.0.7-0ubuntu4.1
    • 26.1.3-0ubuntu1~24.04.1
    • 26.1.3-0ubuntu1~24.04.1+esm1
    • 27.5.1-0ubuntu3~24.04.1
    • 27.5.1-0ubuntu3~24.04.2
    • 28.2.2-0ubuntu1~24.04.1
    • 29.1.3-0ubuntu3~24.04.1
    • 29.1.3-0ubuntu3~24.04.2
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io Ubuntu:26.10

    Versions
    • 27.5.1+dfsg4-2ubuntu1
    • 28.5.2+dfsg4-5ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io-app Ubuntu:26.10

    Versions
    • 29.1.3-0ubuntu4
    • 29.1.3-0ubuntu5
    • 29.1.3-0ubuntu6
    • 29.7.2-0ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io Ubuntu:26.04:LTS

    Versions
    • 26.1.5+dfsg1-9ubuntu1
    • 27.5.1+dfsg4-1ubuntu1
    • 27.5.1+dfsg4-2ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • docker.io-app Ubuntu:26.04:LTS

    Versions
    • 28.2.2-0ubuntu1
    • 29.1.2-0ubuntu1
    • 29.1.3-0ubuntu1
    • 29.1.3-0ubuntu2
    • 29.1.3-0ubuntu3
    • 29.1.3-0ubuntu4
    • 29.1.3-0ubuntu4.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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