Medium 5.3Published Oct 19, 2026

CVE-2026-112273libtins through 4.6 Heap Out-of-Bounds Read via DNS::compose_name

Updated under an hour ago (2026-10-21 02:10 UTC)

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It affects libtins. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-125
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

libtins libtins libtins:libtins (from the name)	through 4.6	CNA record

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
https://www.vulncheck.com/advisories/libtins-through-4.6-heap-out-of-bounds-read-via-dns-compose-namethird-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.