CVE-2026-112273
libtins through 4.6 Heap Out-of-Bounds Read via DNS::compose_name
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-125 |
| Vendor | libtins |
| Product | libtins |
| Published | Oct 19, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low
Affected Versions
libtins / libtins
0 ≤ 4.6
References
hackmd.io: https://hackmd.io/@haindpwn/libtins-dns-name-parsing-oob-read github.com: https://github.com/mfontanini/libtins/blob/v4.6/src/dns.cpp#L338-L389 github.com: https://github.com/mfontanini/libtins vulncheck.com: https://www.vulncheck.com/advisories/libtins-through-4.6-heap-out-of-bounds-read-via-dns-compose-name
Credits
HaiND from the Post and Telecommunication Institute of Technology