CVE-2026-92543
Docker Engine insecure-registry fallback via malicious DNS responses
- State
- Published
- Severity
- 7.6 High
- Published
- Oct 7, 2026
- Updated
- Oct 7, 2026
- Reserved
- Sep 16, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.6 High | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | Docker |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
Docker EngineDocker |
|
MobyMoby |
|
References
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