Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Redhat | Enterprise Linux | 10.0 |
| Thekelleys | Dnsmasq | < 2.93 |
Related Weaknesses (CWE)
References
- https://access.redhat.com/security/cve/CVE-2026-12969MitigationVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2491663Issue TrackingVendor Advisory
FAQ
What is CVE-2026-12969?
CVE-2026-12969 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 a...
How severe is CVE-2026-12969?
CVE-2026-12969 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-12969?
Check the references section above for vendor advisories and patch information. Affected products include: Redhat Enterprise Linux, Thekelleys Dnsmasq.