What’s Vulnerable › Vulnerabilities
CVE-2026-92543: Docker Engine insecure-registry fallback via malicious DNS responses
- Severity: high (CVSS 7.6 v4.0)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-07 · updated 2026-10-08
- Weakness: CWE-295
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
- Docker Engine: before 29.8.2 — fixed in 29.8.2
- Docker Engine: before v2.0.0-beta.25 — fixed in v2.0.0-beta.25
How to fix
Upgrade to a fixed version: Docker Engine 29.8.2; Docker Engine v2.0.0-beta.25. Check the vendor advisory for mitigations.
References
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