CVE 8.7 HIGH

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

June 1, 2026 invoker category_cve

8.7 / 10

HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

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.

AI Analysis

Stack-based buffer overflow in microtar through 0.1.0 via raw_to_header() function

Basic Information

ID CVE-2026-43623

Source VulnCheck

Published Jun 1, 2026 at 18:04

Affected Product

Vendor rxi

Product microtar

Affected Versions rxi microtar 0

CWE Classification

CWE-121

AI Assessment

AI Score 8.7 / 10

AI Severity High

Vendor rxi

Product microtar

Version 0.1.0

References

{
    "lastseen": "",
    "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.",
    "published": "2026-06-01T18:04:14.379Z",
    "modified": "2026-06-01T18:04:14.379Z",
    "type": "cve",
    "title": "microtar 0.1.0 Stack-Based Buffer Overflow via raw_to_header()",
    "source": "VulnCheck",
    "references": "https://github.com/rxi/microtar/issues/28\nhttps://github.com/rxi/microtar/issues/29\nhttps://github.com/rxi/microtar/issues/30\nhttps://www.vulncheck.com/advisories/microtar-stack-based-buffer-overflow-via-raw-to-header",
    "id": "CVE-2026-43623",
    "bulletinFamily": "",
    "cwe": [
        "CWE-121"
    ],
    "cvelist": null,
    "sourceData": "rxi microtar 0",
    "sourceHref": "",
    "cvss": {
        "score": 8.7,
        "severity": "HIGH",
        "vector": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
        "version": "4.0"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "microtar",
    "version": "0",
    "vendor": "rxi",
    "ai_description": "Stack-based buffer overflow in microtar through 0.1.0 via raw_to_header() function",
    "ai_severity": "High",
    "ai_vendor": "rxi",
    "ai_product": "microtar",
    "ai_version": "0.1.0",
    "ai_score": 8.7
}

💭 Join the Security Discussion ❌ Cancel Reply