CVE-2026-92543
High
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.
SeverityHigh
CVSS7.6
Exploit probability—
Product
Microsoft Azl3 Cert-manager
PublishedOct 7, 2026
First seenOct 7, 2026
Weakness typeCWE-295CWE-295CWE-319CWE-319
How to fix
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| microsoft azl3_cert-manager_1.12.15-14 | No range specified | — |
| microsoft azl3_docker-buildx_0.14.0-17 | No range specified | — |
| microsoft azl3_docker-cli_25.0.7-5 | No range specified | — |
| microsoft azl3_docker-compose_2.27.0-14 | No range specified | — |
| microsoft azl3_moby-engine_25.0.3-20 | No range specified | — |
| microsoft azl3_moby-engine_25.0.18-1 | No range specified | — |
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