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TI-2026-76473 Aliases CVE-2026-112273GHSA-q9cp-6gg7-9cpm

Heap out-of-bounds read in libtins DNS::compose_name

Priority HIGH 70CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

libtins through 4.6 contains a heap out-of-bounds read (CWE-125) in DNS::compose_name in src/dns.cpp. A remote unauthenticated attacker can send crafted DNS packets whose additional, answer, or authority records include a label ending exactly at the packet end, causing a one-byte read past the packet buffer. The read can crash applications running on hardened allocators.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00565 47th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
libtinslibtinsup to 4.6—No fix listedCNA
  • libtins Vendorlibtins Affected up to 4.6 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for libtins.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-19 Threatist record created from CVE-2026-112273
  2. 2026-10-19 Alias added: GHSA-q9cp-6gg7-9cpm
  3. 2026-10-20 Affected versions changed · Red Hat
  4. 2026-10-20 CVSS score added · Red Hat
  5. 2026-10-21 Priority changed: MEDIUM → LOW
  6. 2026-10-22 CISA SSVC decision points changed
  7. 2026-10-22 Priority changed: LOW → HIGH

References

Advisory 1

Other 2

  • TI-2026-76474 Out-of-bounds read in libtins DNS::soa_record::init CVSS 4.0MEDIUM 6.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences