CVE-2026-112273

CVSS 6.9 (medium) · published 2026-10-19

libtins through 4.6 contains a heap out-of-bounds read vulnerability in DNS::compose_name in src/dns.cpp that allows remote attackers to read past the packet buffer by sending a label ending exactly at the packet end. Attackers can deliver crafted DNS packets whose additional, answer, or authority records trigger a one-byte read when parsed, crashing applications on hardened allocators.

Weakness: CWE-125

Source: NVD CVE-2026-112273

References

• https://github.com/mfontanini/libtins
• https://github.com/mfontanini/libtins/blob/v4.6/src/dns.cpp#L338-L389
• https://hackmd.io/@haindpwn/libtins-dns-name-parsing-oob-read
• https://www.vulncheck.com/advisories/libtins-through-4.6-heap-out-of-bounds-read-via-dns-compose-name
• https://hackmd.io/@haindpwn/cve-2026-112273-112274-libtins-dns-name-parsing-oob-read

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