CVE-2026-12969

Description

An out-of-bounds read vulnerability exists in dnsmasq's find_soa() function in src/rfc1035.c. When parsing NS section records, extract_name() is called with extrabytes=0, failing to validate that 10 additional bytes exist for fixed-length DNS record fields. A remote attacker controlling a DNS zone can exploit this via a crafted NXDOMAIN response to cause a 10-byte heap out-of-bounds read, potentially accessing stale data from prior transactions.

PUBLISHED Reserved 2026-06-23 | Published 2026-06-23 | Updated 2026-06-23 | Assigner redhat

Problem types

Out-of-bounds Read

Product status

Timeline

Credits

Red Hat would like to thank dolitli for reporting this issue.

References

access.redhat.com/security/cve/CVE-2026-12969 vdb-entry

bugzilla.redhat.com/show_bug.cgi?id=2491663 (RHBZ#2491663) issue-tracking

cve.org (CVE-2026-12969)

nvd.nist.gov (CVE-2026-12969)

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