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7.6 High

CVE-2026-92543 Docker Engine classifies a registry hostname as insecure using an any-match DNS check

Description

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.

Affected products and versions

Product Affected versions Fixed in
Docker Engine 29.8 earliest → < 29.8.2 29.8.2
moby 2.0 earliest → < 2.0.0-beta.25 2.0.0-beta.25

References

Timeline

  1. Published
  2. Last modified

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