CVE-2026-71267

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 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.

CVSS v3 9.8 CRITICAL

9.8^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

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

Configurations

No configuration.

History

23 Oct 2026, 21:10

Type	Values Removed	Values Added
Summary		(es) Las funciones mtar_write_file_header() y mtar_write_dir_header() de microtar (src/microtar.c) copian un nombre de entrada proporcionado por el llamador en el campo ’name’ de 100 bytes de una mtar_header_t asignada en la pila a través de strcpy(h.name, name), sin verificar que strlen(name) sea menor que 100 antes de la copia. Cualquier aplicación que llame a estas funciones con un nombre de archivo influenciado externamente de más de 99 caracteres (por ejemplo, al archivar nombres de archivo proporcionados por el usuario o controlados por el atacante) desencadena un desbordamiento de búfer de pila.

Information

Published : 2026-08-05 13:24

Updated : 2026-10-24 15:10

NVD link : CVE-2026-71267

Mitre link : CVE-2026-71267

CVE.ORG link : CVE-2026-71267

JSON object : View

Products Affected

No product.

CWE

CWE-121

Stack-based Buffer Overflow

{"id": "CVE-2026-71267", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-71267", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-08-05T15:54:06.623542Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 9.8, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 3.9}]}, "affected": [{"source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "affectedData": [{"vendor": "rxi", "product": "microtar", "versions": [{"status": "affected", "version": "0", "versionType": "custom", "lessThanOrEqual": "*"}], "programFiles": ["src/microtar.c"], "defaultStatus": "unaffected"}]}], "published": "2026-08-05T13:24:50.963", "references": [{"url": "https://github.com/rxi/microtar", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"}, {"url": "https://github.com/rxi/microtar/blob/master/src/microtar.c", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c", "description": [{"lang": "en", "value": "CWE-121"}]}], "descriptions": [{"lang": "en", "value": "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 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."}, {"lang": "es", "value": "Las funciones mtar_write_file_header() y mtar_write_dir_header() de microtar (src/microtar.c) copian un nombre de entrada proporcionado por el llamador en el campo \u2019name\u2019 de 100 bytes de una mtar_header_t asignada en la pila a trav\u00e9s de strcpy(h.name, name), sin verificar que strlen(name) sea menor que 100 antes de la copia. Cualquier aplicaci\u00f3n que llame a estas funciones con un nombre de archivo influenciado externamente de m\u00e1s de 99 caracteres (por ejemplo, al archivar nombres de archivo proporcionados por el usuario o controlados por el atacante) desencadena un desbordamiento de b\u00fafer de pila."}], "lastModified": "2026-10-24T15:10:00.190", "sourceIdentifier": "309f9ea4-e3e9-4c6c-b79d-e8eb01244f2c"}