Docker Engine insecure-registry fallback via malicious DNS responses
CVE-2026-92543 is fixed in 3 products on 1 platform, first by ALAS2023-2026-3266, released November 7, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| docker · amzn 2023 | 25.0.18-1.amzn2023.0.1 | ALAS2023-2026-3266 | Nov 7, 2026 |
| docker-debuginfo · amzn 2023 | 25.0.18-1.amzn2023.0.1 | ALAS2023-2026-3266 | Nov 7, 2026 |
| docker-debugsource · amzn 2023 | 25.0.18-1.amzn2023.0.1 | ALAS2023-2026-3266 | Nov 7, 2026 |
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