CVE-2025-66038

{"id": "CVE-2025-66038", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.9, "attackVector": "PHYSICAL", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L", "integrityImpact": "LOW", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "LOW", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 3.4, "exploitabilityScore": 0.5}, {"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.8, "attackVector": "PHYSICAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:P/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": 0.9}]}, "published": "2026-03-30T18:16:18.177", "references": [{"url": "https://github.com/OpenSC/OpenSC/commit/6db171bcb6fd7cb3b51098fefbb3b28e44f0a79c", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/OpenSC/OpenSC/security/advisories/GHSA-72x5-fwjx-2459", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66038", "tags": ["Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Primary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-126"}]}], "descriptions": [{"lang": "en", "value": "OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, sc_compacttlv_find_tag searches a compact-TLV buffer for a given tag. In compact-TLV, a single byte encodes the tag (high nibble) and value length (low nibble). With a 1-byte buffer {0x0A}, the encoded element claims tag=0 and length=10 but no value bytes follow. Calling sc_compacttlv_find_tag with search tag 0x00 returns a pointer equal to buf+1 and outlen=10 without verifying that the claimed value length fits within the remaining buffer. In cases where the sc_compacttlv_find_tag is provided untrusted data (such as being read from cards/files), attackers may be able to influence it to return out-of-bounds pointers leading to downstream memory corruption when subsequent code tries to dereference the pointer. This issue has been patched in version 0.27.0."}, {"lang": "es", "value": "OpenSC es un conjunto de herramientas y middleware de c\u00f3digo abierto para tarjetas inteligentes. Antes de la versi\u00f3n 0.27.0, sc_compacttlv_find_tag busca una etiqueta dada en un b\u00fafer compact-TLV. En compact-TLV, un solo byte codifica la etiqueta (nibble superior) y la longitud del valor (nibble inferior). Con un b\u00fafer de 1 byte {0x0A}, el elemento codificado declara etiqueta=0 y longitud=10 pero no le siguen bytes de valor. Llamar a sc_compacttlv_find_tag con la etiqueta de b\u00fasqueda 0x00 devuelve un puntero igual a buf+1 y outlen=10 sin verificar que la longitud de valor declarada cabe dentro del b\u00fafer restante. En los casos en que a sc_compacttlv_find_tag se le proporcionan datos no confiables (como los le\u00eddos de tarjetas/archivos), los atacantes pueden influir en ella para que devuelva punteros fuera de los l\u00edmites, lo que lleva a una corrupci\u00f3n de memoria posterior cuando el c\u00f3digo subsiguiente intenta desreferenciar el puntero. Este problema ha sido corregido en la versi\u00f3n 0.27.0."}], "lastModified": "2026-04-01T17:40:36.183", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:opensc_project:opensc:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D890677F-5379-4587-B8E7-D38B02AD525A", "versionEndExcluding": "0.27.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}