CVE-2026-112273
libtins through 4.6 Heap Out-of-Bounds Read via DNS::compose_name
- State
- Published
- Severity
- 6.9 Medium
- Published
- Oct 19, 2026
- Updated
- Oct 22, 2026
- Reserved
- Oct 19, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 5.3 Medium | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | VulnCheck |
Weaknesses
- CWE-125 Out-of-bounds Read
Affected Products
| Product | Versions |
|---|---|
libtinslibtins |
|
References
- https://hackmd.io/@haindpwn/libtins-dns-name-parsing-oob-readthird-party-advisory
- https://github.com/mfontanini/libtins/blob/v4.6/src/dns.cpp#L338-L389technical-description
- https://github.com/mfontanini/libtinsproduct
- VulnCheck Advisory: libtins through 4.6 Heap Out-of-Bounds Read via DNS::compose_namethird-party-advisory
- https://hackmd.io/@haindpwn/cve-2026-112273-112274-libtins-dns-name-parsing-oob-readexploit
Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.