CVE-2026-34380

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{"affected": [{"affectedData": [{"product": "openexr", "vendor": "AcademySoftwareFoundation", "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"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*", "matchCriteriaId": "4E7AA082-2647-4AAD-9902-1E3873882A3D", "versionEndExcluding": "3.2.7", "versionStartIncluding": "3.2.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*", "matchCriteriaId": "E8321A2E-759A-4B1E-9AAF-0204791F4323", "versionEndExcluding": "3.3.9", "versionStartIncluding": "3.3.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:openexr:openexr:*:*:*:*:*:*:*:*", "matchCriteriaId": "94F2D271-636B-4E9E-A04B-40E635A59117", "versionEndExcluding": "3.4.9", "versionStartIncluding": "3.4.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}], "id": "CVE-2026-34380", "lastModified": "2026-10-26T21:10:00.170", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 1.6, "impactScore": 4.2, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-34380", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-04-07T14:12:54.907799Z", "version": "2.0.3"}}]}, "published": "2026-04-06T16:16:35.400", "references": [{"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.2.7"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.3.9"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.9"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-q3v8-hw4m-59w5"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}, {"lang": "en", "value": "CWE-787"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "OpenEXR: OpenEXR: Denial of Service due to signed integer overflow in image decoding", "id": "2455384", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2455384"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-190", "details": ["A flaw was found in OpenEXR, an image storage format library. A remote attacker could exploit a signed integer overflow vulnerability in the `undo_pxr24_impl()` function when processing a specially crafted EXR image file. This overflow can cause the application to write pixel data beyond its allocated memory buffer, leading to a buffer overflow. The primary consequence of this vulnerability is a denial of service, which could make the application unavailable."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-34380", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "openexr", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "OpenEXR", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "OpenEXR", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "OpenEXR", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "openexr", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-06T15:22:40Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34380\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34380\nhttps://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-q3v8-hw4m-59w5"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.2.0,3.2.7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.3.0,3.3.9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.4.0,3.4.9)"}}], "enrichment": {"confidence": 82.0, "confidence_source": "matching", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 82.0, "source": "matching"}]}, "original": {"product": "openexr", "source": "cna", "vendor": "AcademySoftwareFoundation"}, "product": "openexr", "vendor": "academysoftwarefoundation"}], "analysis": {"en": {"generated_at": "2026-04-07T21:41:05.950352+00:00", "value": {"mitigation_remediation": ["Update the OpenEXR library to version 3.2.7 or later, or to 3.3.9 or 3.4.9, which contain the fix for the overflow."], "summary": {"action": "Patch", "impact": "Memory corruption with potential for arbitrary code execution"}, "threat_synthesis": {"affected_systems": "The vulnerability affects OpenEXR releases from version 3.2.0 up through, but not including, 3.2.7, and analogously from 3.3.0\u20113.3.8 and 3.4.0\u20113.4.8. The only vendor listed is the Academy Software Foundation, maintaining the openexr library.", "description_and_impact": "OpenEXR contains a signed integer overflow in the undo_pxr24_impl function of the PXR24 decompression routine, which can lead to a bounds\u2011check bypass. The overflow occurs when a large value for the width parameter is multiplied by three as a signed 32\u2011bit integer before being cast to an unsigned 64\u2011bit value; this undefined behavior can wrap to a small positive number. If the bounds check is incorrectly satisfied, the decompression loop writes pixel data beyond the allocated output buffer, allowing an attacker to corrupt memory and potentially achieve arbitrary code execution. The weakness is characterized as a signed integer overflow (CWE\u2011190) and out\u2011of\u2011bounds write (CWE\u2011787).", "risk_and_exploitability": "The CVSS base score of 5.9 indicates moderate to high risk, while the EPSS score of less than 1% suggests a low likelihood of exploitation in the wild. The vulnerability is not registered in CISA\u2019s KEV catalog, implying no known active exploitation. Based on the description, the likely attack vector is the processing of a crafted EXR file by an application that incorporates the vulnerable OpenEXR library, which could be local or remote depending on the application\u2019s exposure to untrusted input."}}}}, "created": "2026-04-06T20:14:06.609723+00:00", "updated": "2026-04-08T19:50:45.268034+00:00", "vendors": ["academysoftwarefoundation", "academysoftwarefoundation$PRODUCT$openexr"]}