CVE catalog
CVE-2026-112273
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 a
- Severity
- High · CVSS 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 0.56% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libtins | sid | 4.5-1.1 | unknown |
| Debian | libtins | forky | 4.5-1.1 | unknown |
| Debian | libtins | trixie | 4.5-1 | unknown |
| Debian | libtins | bookworm | 4.0-1 | unknown |
| Ubuntu | libtins | 18.04 | 3.4-2 | vulnerable |
| Ubuntu | libtins | 18.04 | 3.4-2build1 | vulnerable |
| Ubuntu | libtins | 20.04 | 4.0-1 | vulnerable |
| Ubuntu | libtins | 20.04 | 4.0-1build1 | vulnerable |
| Ubuntu | libtins | 22.04 | 4.0-1build1 | vulnerable |
| Ubuntu | libtins | 22.04 | 4.0-1build2 | vulnerable |
| Ubuntu | libtins | 24.04 | 4.0-1build2 | vulnerable |
| Ubuntu | libtins | 24.04 | 4.5-1 | vulnerable |
| Ubuntu | libtins | 24.04 | 4.5-1build1 | vulnerable |
| Ubuntu | libtins | 24.04 | 4.5-1build2 | vulnerable |
| Ubuntu | libtins | 26.10 | 4.5-1.1 | vulnerable |
| Ubuntu | libtins | 26.10 | 4.5-1.1build1 | vulnerable |
| Ubuntu | libtins | 26.04 | 4.5-1build2 | vulnerable |
| Ubuntu | libtins | 26.04 | 4.5-1.1 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libtins | source | sid | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | libtins | source | forky | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | libtins | source | trixie | (unfixed) | not yet assigned | Not reported | Not reported |
| Debian | libtins | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libtins4.0]Affected
Source package: [libtins]
Details (2)
4.0-1+b1· arm64 · bookwormAffected
nvd · libtins · debian · bookworm; nvd · libtins · debian · 12
4.0-1+b2· amd64 · bookwormAffected
nvd · libtins · debian · bookworm; nvd · libtins · debian · 12
- [libtins-dev]Affected
Source package: [libtins]
Details (2)
4.0-1+b1· arm64 · bookwormAffected
nvd · libtins · debian · bookworm; nvd · libtins · debian · 12
4.0-1+b2· amd64 · bookwormAffected
nvd · libtins · debian · bookworm; nvd · libtins · debian · 12
[Debian 13 (Trixie)]
- [libtins4.5]Affected
Source package: [libtins]
Details (2)
4.5-1+b2· amd64 · trixieAffected
nvd · libtins · debian · 13
4.5-1+b2· arm64 · trixieAffected
nvd · libtins · debian · 13
- [libtins-dev]Affected
Source package: [libtins]
Details (2)
4.5-1+b2· amd64 · trixieAffected
nvd · libtins · debian · 13
4.5-1+b2· arm64 · trixieAffected
nvd · libtins · debian · 13
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-112273]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-112273]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-112273]
- [https://security-tracker.debian.org/tracker/CVE-2026-112273]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-112273.json]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]