CVE-2026-34545

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From version 3.4.0 to before version 3.4.7, an attacker providing a crafted .exr file with HTJ2K compression and a channel width of 32768 can write controlled data beyond the output heap buffer in any application that decodes EXR images. The write primitive is 2 bytes per overflow iteration or 4 bytes (by another path), repeating for each additional pixel past the overflow point. In this context, a heap write overflow can lead to remote code execution on systems. This issue has been patched in version 3.4.7."}, {"lang": "es", "value": "OpenEXR proporciona la especificaci\u00f3n y la 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 3.4.0 hasta antes de la versi\u00f3n 3.4.7, un atacante que proporciona un archivo .exr manipulado con compresi\u00f3n HTJ2K y un ancho de canal de 32768 puede escribir datos controlados m\u00e1s all\u00e1 del b\u00fafer de salida del mont\u00f3n en cualquier aplicaci\u00f3n que decodifique im\u00e1genes EXR. La primitiva de escritura es de 2 bytes por iteraci\u00f3n de desbordamiento o 4 bytes (por otra ruta), repiti\u00e9ndose por cada p\u00edxel adicional m\u00e1s all\u00e1 del punto de desbordamiento. En este contexto, un desbordamiento de escritura en el mont\u00f3n puede conducir a la ejecuci\u00f3n remota de c\u00f3digo en los sistemas. Este problema ha sido parcheado en la versi\u00f3n 3.4.7."}], "id": "CVE-2026-34545", "lastModified": "2026-10-26T22:10:00.163", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.3, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.3, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}], "cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-34545", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-04-03T19:46:42.924931Z", "version": "2.0.3"}}]}, "published": "2026-04-01T21:17:01.640", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/AcademySoftwareFoundation/openexr/commit/3827998f5c041d6a94c6af24bbb363daa669e4b3"}, {"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.7"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-ghfj-fx47-wg97"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://access.redhat.com/security/cve/CVE-2026-34545"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454139"}, {"source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-34545.json"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}, {"lang": "en", "value": "CWE-190"}], "source": "security-advisories@github.com", "type": "Secondary"}, {"description": [{"lang": "en", "value": "CWE-1284"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{"bugzilla": {"description": "OpenEXR: OpenEXR: Remote code execution via crafted EXR files", "id": "2454139", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454139"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-1284", "details": ["A flaw was found in OpenEXR, an image storage format for the motion picture industry. An attacker can exploit this vulnerability by providing a specially crafted .exr file with HTJ2K compression and a specific channel width. This allows controlled data to be written beyond the output heap buffer, leading to a heap write overflow. This issue can ultimately result in remote code execution on systems that decode these malicious EXR images."], "mitigation": {"lang": "en:us", "value": "Restrict the processing of untrusted OpenEXR image files. Systems should be configured to only decode .exr files from known and trusted sources to prevent exploitation of the heap write overflow vulnerability. This operational control limits exposure to malicious input."}, "name": "CVE-2026-34545", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "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": "Affected", "package_name": "OpenEXR", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "OpenEXR", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "openexr", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-01T20:51:45Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34545\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34545\nhttps://github.com/AcademySoftwareFoundation/openexr/commit/3827998f5c041d6a94c6af24bbb363daa669e4b3\nhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.7\nhttps://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-ghfj-fx47-wg97"], "statement": "This is an Important vulnerability in OpenEXR that could lead to remote code execution. The flaw occurs when processing a specially crafted EXR image file with HTJ2K compression and a specific channel width, resulting in a heap write overflow. Red Hat products that utilize OpenEXR for image decoding are affected if they process untrusted EXR files.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.4.0,3.4.7)"}}], "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": "2026-04-07T22:36:03.046980+00:00", "value": {"mitigation_remediation": ["Upgrade OpenEXR to 3.4.7 or later", "If an upgrade is not feasible, disable or restrict processing of HTJ2K\u2011compressed .exr files in the application", "Monitor for abnormal memory usage, crashes, or RCE attempts in applications that use OpenEXR", "Verify that no older OpenEXR versions remain installed on the system"], "summary": {"action": "Apply Patch", "impact": "Remote Code Execution via Heap Overflow"}, "threat_synthesis": {"affected_systems": "OpenEXR versions 3.4.0 through 3.4.6 are affected. Any application that links against these library releases and decodes .exr files containing HTJ2K compressed data is at risk. The issue was addressed in OpenEXR 3.4.7, which introduces bounds checks that prevent the overflow.", "description_and_impact": "The vulnerability is an integer overflow in the HTJ2K decoder of OpenEXR. A malicious .exr file that uses HTJ2K compression and sets a channel width of 32768 can cause the decoder to calculate a buffer size that is too small. The overflow causes the program to write controlled data beyond the allocated heap buffer. This out\u2011of\u2011bounds write can overwrite arbitrary heap memory, providing a write primitive that can be leveraged to execute arbitrary code. The weakness is a buffer overflow, signed integer overflow, and arithmetic error as indicated by the associated CWEs.", "risk_and_exploitability": "The CVSS score of 8.4 indicates high severity, and the EPSS score of less than 1% suggests exploitation probability remains low at present. The vulnerability is not listed in CISA\u2019s KEV catalog, so it is not currently known to be actively exploited. The likely attack vector requires delivery of a crafted .exr file to the vulnerable application; if the application parses files from an untrusted source, the attacker could gain remote code execution by controlling the heap layout. The impact includes potential compromise of confidentiality, integrity, and availability of the affected system."}}}}, "created": "2026-04-02T07:47:29.218671+00:00", "updated": "2026-04-08T19:56:51.966772+00:00", "vendors": ["academysoftwarefoundation", "academysoftwarefoundation$PRODUCT$openexr"]}