CVE-2026-93008 Dnsmasq: dnsmasq: out-of-bailiwick cache injection through cname chase in split-dns configurations
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-93008?
CVE-2026-93008 is a medium-severity vulnerability in Red Hat Ceph Storage 9, published on 29 Oct 2026.
Official description
A flaw was found in dnsmasq. When following a CNAME in a DNS response, the resolver can cache records for the CNAME target without checking that those records belong to the responding server's authorized zone. In split-DNS deployments that send some domains to a specific upstream, an attacker who controls that upstream can inject cache entries for unrelated names. Later clients may then receive attacker-chosen addresses for those names.
Weakness: CWE-345
Which versions are affected by CVE-2026-93008?
How do I fix CVE-2026-93008?
No fix has been published for CVE-2026-93008 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-93008 being exploited?
There is no known exploitation of CVE-2026-93008 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-93008, GHSA-wpph-r7r5-526c.