CVE-2026-92543
Docker Engine classifies a registry hostname as insecure using an any-match DNS check
- Risk score
- 61/100
- CVSS
- 7.6 v4.0
- Exploit chance (30 days)
- 0.1%
- Published
- 7 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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-…
- Affected
- See advisory
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 7.6 high
- Remotely exploitable without logging in
- On your watchlist: docker
References
Original 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.
Last activity 7 Oct 2026. Patch Forecast updates every hour.