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TI-2026-75055 Aliases CVE-2026-111273GHSA-2v49-qr2f-xxxp

Off-by-one heap buffer overflow in unarr TAR name parsing

Priority MEDIUM 64CWE-193Published · Updated

Key facts

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

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

Summary

unarr through 1.1.1 by selmf contains an off-by-one heap-based buffer overflow in tar_get_name() (CWE-193). A crafted TAR archive with a full ustar prefix and name makes the parser write a NUL byte past the allocation, corrupting heap memory and crashing the process. CISA's SSVC assessment lists exploitation as proof of concept.

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

Description from the CNA

unarr through 1.1.1 contains an off-by-one heap-based buffer overflow in tar_get_name() in tar/parse-tar.c, reachable through the ar_entry_get_name() API. Attackers can supply a crafted TAR archive with a full ustar prefix and name to write a NUL byte past the allocation, corrupting heap memory and crashing the process.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00209 11th 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
No
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
selmfunarrup to 1.1.1—No fix listedCNA
  • unarr Vendorselmf Affected up to 1.1.1 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for unarr.

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

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-111273
  2. 2026-10-16 Priority changed: MEDIUM → LOW
  3. 2026-10-18 CISA SSVC decision points changed
  4. 2026-10-18 Priority changed: LOW → MEDIUM
  5. 2026-10-18 Alias added: GHSA-2v49-qr2f-xxxp

References

Other 3

  • TI-2026-75056 Heap out-of-bounds read in unarr ZIP extra field parsing CVSS 4.0MEDIUM 6.8

Sources

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