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TI-2026-40236 Aliases CVE-2026-55738GHSA-7fm7-h87x-9hjq

Stack Buffer Overflow in rxi/microtar raw_to_header() via non-null-terminated TAR name field

Priority MEDIUM 40CWE-121Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

A stack-based buffer overflow exists in the raw_to_header function in src/microtar.c in rxi microtar 0.1.0. The function copies the 100-byte name and linkname fields of a TAR header with strcpy without guaranteeing null termination of the source.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00398 34th 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
None
Automatable
No
Technical impact
Total

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

Affected products

VendorProductAffected versionsFixed inStatusSource
rximicrotar0.1.0 and later—No fix listedCNA
  • microtar Vendorrxi Affected 0.1.0 and later Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-55738
  2. 2026-10-03 Alias added: GHSA-7fm7-h87x-9hjq

References

Other 3

  • TI-2026-31728 microtar 0.1.0 Stack-Based Buffer Overflow via raw_to_header() CVSS 4.0HIGH 8.7
  • TI-2026-03475 rxi fe fe.c read_ out-of-bounds CVSS 4.0MEDIUM 4.8
  • TI-2026-49935 microtar Stack Buffer Overflow in mtar_write_file_header() and mtar_write_dir_header() CVSS 3.1CRITICAL 9.8
  • TI-2026-39293 Integer Overflow in rxi/microtar mtar_next() Causes Infinite Loop DoS CVSS 4.0HIGH 8.7

Sources

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