CVE-2026-112273
mediumlibtins 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 b…
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/mfontanini/libtins disclosure@vulncheck.com
- https://github.com/mfontanini/libtins/blob/v4.6/src/dns.cpp#L338-L389 disclosure@vulncheck.com
- https://hackmd.io/@haindpwn/libtins-dns-name-parsing-oob-read disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/libtins-through-4.6-heap-out-of-bounds-read-via-dns-c... disclosure@vulncheck.com
- https://hackmd.io/@haindpwn/cve-2026-112273-112274-libtins-dns-name-parsing-oob-read 134c704f-9b21-4f2e-91b3-4a467353bcc0