CVE-2026-92543
Fixed in a distro release EPSS <1%CVSS 7.6
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.
Products: Docker Engine, moby
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | docker-28 | no fix |
| Chainguard | py3-docker | 0 |
| Chainguard | py3.10-docker | 0 |
| Chainguard | py3.11-docker | 0 |
| Chainguard | py3.12-docker | 0 |
| Chainguard | py3.13-docker | 0 |
| Debian 12 | docker.io | no fix |
| Debian 13 | docker.io | no fix |
| Debian 14 | docker.io | no fix |
| Ubuntu 26.04 LTS | docker.io | no fix |
| Ubuntu 26.04 LTS | docker.io-app | no fix |
| Ubuntu 26.10 | docker.io | no fix |
| Ubuntu 26.10 | docker.io-app | no fix |
| Ubuntu Pro 16.04 LTS | docker.io | no fix |
| Ubuntu Pro 18.04 LTS | docker.io | no fix |
| Ubuntu Pro 20.04 LTS | docker.io | no fix |
| Ubuntu Pro 20.04 LTS | docker.io-app | no fix |
| Ubuntu Pro 22.04 LTS | docker.io | no fix |
| Ubuntu Pro 22.04 LTS | docker.io-app | no fix |
| Ubuntu Pro 24.04 LTS | docker.io | no fix |
| Ubuntu Pro 24.04 LTS | docker.io-app | no fix |
| Wolfi | docker-28 | no fix |
| Wolfi | py3-docker | 0 |
| Wolfi | py3.10-docker | 0 |
| Wolfi | py3.11-docker | 0 |
| Wolfi | py3.12-docker | 0 |
| Wolfi | py3.13-docker | 0 |