What is CVE-2026-93011?

CVE-2026-93011 is a medium-severity vulnerability in Red Hat Ceph Storage 9, classified under Out-of-bounds Write. CVSS score: 5.3/10. Published 2026-10-29.

How severe is CVE-2026-93011?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Buffer overflow in Red Hat Ceph Storage 9

CVE-2026-93011

A flaw was found in dnsmasq. After a reduction of internal domain-name buffer sizes, the DNSSEC validator can write a few bytes past a name buffer when converting names to and from DNS wire format. An attacker who can cause the server to validate a crafted DNSSEC response may overwrite a small amount of adjacent heap metadata. DNSSEC support is not compiled in by default and must also be enabled at runtime.

Vulnerability class: Buffer Overflow

Published 2026-10-29 · last modified 2026-10-29.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

access.redhat.com/security/cve/CVE-2026-93011 (vdb-entry)
bugzilla.redhat.com/show_bug.cgi (issue-tracking)

Frequently asked questions

What is CVE-2026-93011?: CVE-2026-93011 is a medium-severity vulnerability in Red Hat Ceph Storage 9, classified under Out-of-bounds Write. CVSS score: 5.3/10. Published 2026-10-29.
How severe is CVE-2026-93011?: Medium severity. CVSS v3 base score is 5.3 out of 10.