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 Details
- CVSS 3.1 Base Score: 5.3
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade dnsmasq | Sep 21, 2026 | Jun 23, 2026 |
| Ubuntu | — | Upgrade dnsmasqUpgrade dnsmasq-baseUpgrade dnsmasq-utilsUpgrade dnsmasq-utils (Ubuntu Pro)Upgrade dnsmasq (Ubuntu Pro)Upgrade dnsmasq-base (Ubuntu Pro)Upgrade dnsmasq-base-luaUpgrade dnsmasq-base-lua (Ubuntu Pro) | Jul 15, 2026 | Jul 14, 2026 |
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