# CVE-2026-92543: Docker Engine insecure-registry fallback via malicious DNS responses

> CVE-2026-92543: Docker Engine insecure-registry fallback via malicious DNS responses. CVSS 7.6 (CVSS 4.0).

Canonical: https://rewindex.com/cve/CVE-2026-92543
Last updated: 2026-10-08T20:46:35Z

- Published: 2026-10-07 16:44 UTC · Updated: 2026-10-08 20:46 UTC · Assigner: Docker
- CVSS: 7.6 (CVSS 4.0) · Severity: High
- EPSS: 0.09%, 0th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-295, CWE-319

## 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 vendors and products

- Docker: Docker Engine
- Moby: Moby

## Tracked companies

- [Docker](https://rewindex.com/company/docker.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-92543)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-92543)
- [https://github.com/moby/moby/security/advisories/GHSA-7cfq-22r6-qp73](https://github.com/moby/moby/security/advisories/GHSA-7cfq-22r6-qp73)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-92543 · Markdown: https://rewindex.com/cve/CVE-2026-92543.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-92543 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:15:06.019Z