medium5.3
CVE-2026-12969
An out-of-bounds read vulnerability exists in dnsmasq's find_soa() function in src/rfc1035.c.
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Redhat | Enterprise Linux | Version 10.0 |
| Thekelleys | Dnsmasq | before 2.93 |