PT-2026-45517 · Git+1 · Microtar

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

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions microtar version 0.1.0

Description A stack-based buffer overflow occurs in the raw to header() function within src/microtar.c. This issue allows attackers to corrupt adjacent stack memory by providing a specially crafted TAR archive containing name or linkname fields that are not null-terminated. The function utilizes strcpy() to copy 100-byte ustar format fields; when these fields lack null terminators, it can result in writes of up to 355 bytes into a 100-byte destination buffer. This happens when the mtar open(), mtar find(), or mtar read header() functions process the malicious archive.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Stack Overflow

Weakness Enumeration

CWE-121

Related Identifiers

CVE-2026-43623

Affected Products

Microtar

References · 8

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43623.json · Exploit
• 🔥 https://github.com/rxi/microtar/issues/28 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-43623 · Security Note
• https://osv.dev/vulnerability/CVE-2026-43623 · Vendor Advisory
• https://github.com/rxi/microtar · Note
• https://github.com/rxi/microtar/issues/30 · Note
• https://github.com/rxi/microtar/issues/29 · Note
• https://vulncheck.com/advisories/microtar-stack-based-buffer-overflow-via-raw-to-header · Note