CVE-2026-34380

{"id": "CVE-2026-34380", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-34380", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-04-07T14:12:54.907799Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "HIGH", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 4.2, "exploitabilityScore": 1.6}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "AcademySoftwareFoundation", "product": "openexr", "versions": [{"status": "affected", "version": ">= 3.2.0, < 3.2.7"}, {"status": "affected", "version": ">= 3.3.0, < 3.3.9"}, {"status": "affected", "version": ">= 3.4.0, < 3.4.9"}]}]}], "published": "2026-04-06T16:16:35.400", "references": [{"url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7", "tags": ["Product", "Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9", "tags": ["Product", "Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9", "tags": ["Product", "Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-q3v8-hw4m-59w5", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-190"}, {"lang": "en", "value": "CWE-787"}]}], "descriptions": [{"lang": "en", "value": "OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. From 3.2.0 to before 3.2.7, 3.3.9, and 3.4.9, a signed integer overflow exists in undo_pxr24_impl() in src/lib/OpenEXRCore/internal_pxr24.c at line 377. The expression (uint64_t)(w * 3) computes w * 3 as a signed 32-bit integer before casting to uint64_t. When w is large, this multiplication constitutes undefined behavior under the C standard. On tested builds (clang/gcc without sanitizers), two's-complement wraparound commonly occurs, and for specific values of w the wrapped result is a small positive integer, which may allow the subsequent bounds check to pass incorrectly. If the check is bypassed, the decoding loop proceeds to write pixel data through dout, potentially extending far beyond the allocated output buffer. This vulnerability is fixed in 3.2.7, 3.3.9, and 3.4.9."}, {"lang": "es", "value": "OpenEXR proporciona la especificaci\u00f3n e implementaci\u00f3n de referencia del formato de archivo EXR, un formato de almacenamiento de im\u00e1genes para la industria cinematogr\u00e1fica. Desde la versi\u00f3n 3.2.0 hasta antes de la 3.2.7, 3.3.9 y 3.4.9, existe un desbordamiento de entero con signo en undo_pxr24_impl() en src/lib/OpenEXRCore/internal_pxr24.c en la l\u00ednea 377. La expresi\u00f3n (uint64_t)(w * 3) calcula w * 3 como un entero con signo de 32 bits antes de convertirlo a uint64_t. Cuando w es grande, esta multiplicaci\u00f3n constituye un comportamiento indefinido seg\u00fan el est\u00e1ndar C. En compilaciones probadas (clang/gcc sin sanitizers), com\u00fanmente ocurre un desbordamiento por complemento a dos, y para valores espec\u00edficos de w el resultado desbordado es un entero positivo peque\u00f1o, lo que puede permitir que la comprobaci\u00f3n de l\u00edmites subsiguiente pase incorrectamente. Si la comprobaci\u00f3n es eludida, el bucle de decodificaci\u00f3n procede a escribir datos de p\u00edxeles a trav\u00e9s de dout, extendi\u00e9ndose potencialmente mucho m\u00e1s all\u00e1 del b\u00fafer de salida asignado. Esta vulnerabilidad se corrige en las versiones 3.2.7, 3.3.9 y 3.4.9."}], "lastModified": "2026-10-26T21:10:00.170", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "4E7AA082-2647-4AAD-9902-1E3873882A3D", "versionEndExcluding": "3.2.7", "versionStartIncluding": "3.2.0"}, {"criteria": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E8321A2E-759A-4B1E-9AAF-0204791F4323", "versionEndExcluding": "3.3.9", "versionStartIncluding": "3.3.0"}, {"criteria": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "94F2D271-636B-4E9E-A04B-40E635A59117", "versionEndExcluding": "3.4.9", "versionStartIncluding": "3.4.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}