Description (CNA)
A buffer overflow in dnsmasq’s extract_addresses() function allows an attacker to trigger a heap out-of-bounds read and crash by exploiting a malformed DNS response, enabling extract_name() to advance the pointer past the record’s end.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| dnsmasq / dnsmasq | affected 0 before 2.92rel2 |
CWE
No CWE identifiers supplied.
References
- https://www.kb.cert.org/vuls/id/471747
- https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html
- https://thekelleys.org.uk/dnsmasq/CVE/
- https://github.com/NixOS/nixpkgs/pull/519082
- https://github.com/NixOS/nixpkgs/pull/519093
- https://github.com/pi-hole/FTL/releases/tag/v6.6.2
ADP enrichment
No English description supplied.
No references supplied.
A heap out-of-bounds read vulnerability was discovered in dnsmasq's DNS response processing. The extract_addresses() function trusts the declared record data length (rdlen) without verifying that a subsequent call to extract_name() stays within the record boundary. A crafted DNS response with a mismatched rdlen causes the remaining-bytes calculation to underflow, resulting in a massive out-of-bounds read and process crash.