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Vulnerabilities CVE-2026-12969

CVE-2026-12969

Medium
Open
TLP:CLEAR

Dnsmasq: dnsmasq: out-of-bounds read in find_soa() due to missing extrabytes validation

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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.

Details

CVSS Score
5.3
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Confidence
90%
Published
Jun 23, 2026
Last Modified
Aug 21, 2026
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