PT-2026-45517 · Rxi · Microtar

Byambadalai Sumiya + 1 · Published 2026-06-01 · Updated 2026-06-01 · CVE-2026-43623

Mitre

CVSS v3.1

8.8

High

Base vector

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

microtar through 0.1.0 contains a stack-based buffer overflow vulnerability in the raw to header() function in src/microtar.c that allows attackers to corrupt adjacent stack memory by supplying a crafted TAR archive with non-null-terminated name or linkname fields. The function uses strcpy() to copy 100-byte ustar format fields that lack null terminators, causing writes of up to 355 bytes into a 100-byte destination buffer when mtar open(), mtar find(), or mtar read header() process attacker-supplied TAR archives.

Exploit

Fix

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

CVE-2026-43623

Affected Products

Microtar

References · 5

• 🔥 https://github.com/rxi/microtar/issues/28 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-43623 · Security Note
• https://github.com/rxi/microtar/issues/29 · Note
• https://github.com/rxi/microtar/issues/30 · Note
• https://vulncheck.com/advisories/microtar-stack-based-buffer-overflow-via-raw-to-header · Note