CVE-2026-71267

CRITICAL 9.8

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

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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 `name` 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. Any application that calls these functions with an externally-influenced filename longer than 99 characters (e.g. when archiving user-supplied or attacker-controlled filenames) triggers a stack buffer overflow.

CWE	CWE-121
Vendor	rxi
Product	microtar
Published	Aug 5, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

rxi / microtar

0 ≤ *

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/rxi/microtar github.com: https://github.com/rxi/microtar/blob/master/src/microtar.c

Credits

Alibek Baxtiyorov