Medium severity · published Oct 19, 2026
CVE-2026-112273
libtins through 4.6 Heap Out-of-Bounds Read via DNS::compose_name
5.3
CVSS
0.6%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 47% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
LI
libtins · libtins
through 4.6 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-112273
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-112273
github.com
https://github.com/mfontanini/libtins
github.com
https://github.com/mfontanini/libtins/blob/v4.6/src/dns.cpp#L338-L389
hackmd.io
https://hackmd.io/@haindpwn/libtins-dns-name-parsing-oob-read
www.vulncheck.com
https://www.vulncheck.com/advisories/libtins-through-4.6-heap-out-of-bounds-read-via-dns-compose-name
hackmd.io
https://hackmd.io/@haindpwn/cve-2026-112273-112274-libtins-dns-name-parsing-oob-read
More from libtins
3.7
CVE-2026-112274
libtins through 4.6 Out-of-Bounds Read via DNS::soa_record::init