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TI-2026-49935 Aliases CVE-2026-71267GHSA-3h9h-4m9g-9m4r

microtar Stack Buffer Overflow in mtar_write_file_header() and mtar_write_dir_header()

Priority MEDIUM 50CWE-121Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

microtar's mtar_write_file_header and mtar_write_dir_header functions (src/microtar.c) copy a caller-supplied entry name into the 100-byte field of a stack-allocated mtar_header_t via strcpy(h.name, name), with no check that strlen(name) is less than 100 before the copy.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00553 46th 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
Yes
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
rximicrotarall versions—No fix listedCNA
  • microtar Vendorrxi Affected all versions 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-2026-71267
  2. 2026-10-03 Alias added: GHSA-3h9h-4m9g-9m4r

References

Advisory 2

  • 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-2026-40236 Stack Buffer Overflow in rxi/microtar raw_to_header() via non-null-terminated TAR name field CVSS 4.0HIGH 8.7
  • 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