CVE-2026-112273
libtins through 4.6 contains a heap out-of-bounds read vulnerability in DNS::compose_name in…
- Risk score
- 41/100
- CVSS
- 5.3 v3.1
- Exploit chance (30 days)
- 0.6%
- Published
- 19 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 on…
- Affected
- See advisory
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Why it is Yellow
- CVSS 5.3 medium
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
Original 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.
Last activity 19 Oct 2026. Patch Forecast updates every hour.