CVE-2026-5172
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...
- Published
- May 11, 2026
- Updated
- Sep 1, 2026
- Assigning CNA
- certcc
- Evidence observed
- Aug 8, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HLow · next 30 days
- Percentile
- 51.7%
- Model date
- Oct 15, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
- dnsmasq-cve-2026Scanner
Automated defect verification tool for 6 dnsmasq CVEs (CVE-2026-2291, 4890, 4891, 4892, 4893, 5172)
CVE-2026-5172: buffer overflow in extract_addresses() on crafted resource record PoC
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