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CVE-2026-43623— microtar 0.1.0 Stack-Based Buffer Overflow via raw_to_header()

Quick assessment

Affected
rxi microtar
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

microtar是rxi个人开发者的一个轻量级ANSI C语言tar库。 microtar 0.1.0及之前版本存在安全漏洞，该漏洞源于raw_to_header函数使用strcpy复制非空终止的ustar格式字段，可能导致攻击者通过提供特制TAR存档破坏相邻栈内存。

CVSS 8.8 · High EPSS 0.57% · P46

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
rxi microtar ≤ 0.1.0 affected
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I. Basic Information for CVE-2026-43623

Vulnerability Information
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Vulnerability Title
microtar 0.1.0 Stack-Based Buffer Overflow via raw_to_header()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
microtar 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
microtar是rxi个人开发者的一个轻量级ANSI C语言tar库。 microtar 0.1.0及之前版本存在安全漏洞，该漏洞源于raw_to_header函数使用strcpy复制非空终止的ustar格式字段，可能导致攻击者通过提供特制TAR存档破坏相邻栈内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
rxi microtar 0 ~ 0.1.0 -

II. Public POCs for CVE-2026-43623

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 13729 chars
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III. Intelligence Information for CVE-2026-43623

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Patches & Fixes for CVE-2026-43623 (1)

Vendor Advisories for CVE-2026-43623 (2)

Other References for CVE-2026-43623 (1)

IV. Related Vulnerabilities

Same product: microtar
Same vendor: rxi
Same weakness: CWE-121

V. Comments for CVE-2026-43623

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