CVE-2026-27622
OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In CompositeDeepScanLine::readPixels, per-pixel totals are accumulated in vector<unsigned int> total_sizes for attacker-controlled large counts across many parts, total_sizes[ptr] wraps modulo 2^32. overall_sample_count is then derived from wrapped totals and used in samples[channel].resize(overall_sample_count). Decode pointer setup/consumption proceeds with true sample counts, and write operations in core unpack (generic_unpack_deep_pointers) overrun the undersized composite sample buffer. This vulnerability is fixed in v3.2.6, v3.3.8, and v3.4.6.
CVSS
- Versión: 4.0
- Vector: 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
- Puntuación base: 8.4
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.22%
- Percentil entre todas las CVEs puntuadas: 12
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1203Exploitation for Client Executionexecution85 % - Impacto principal
T1059Command and Scripting Interpreterexecution75 % - Impacto secundario
T1499.004Application or System Exploitationimpact60 %
AV:L + UI:A indica ejecución en cliente (abrir archivo EXR preparado). Buffer overflow (CWE-787) permite RCE. Impacto: ejecución de código + DoS por corrupción de memoria.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (1)
CWE
- CWE-787
- CWE-190
Referencias
- https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-cr4v-6jm6-4963
- https://access.redhat.com/errata/RHSA-2026:12338
- https://access.redhat.com/errata/RHSA-2026:12339
- https://access.redhat.com/errata/RHSA-2026:12340
- https://access.redhat.com/errata/RHSA-2026:12341
- https://access.redhat.com/errata/RHSA-2026:16008
- https://access.redhat.com/errata/RHSA-2026:16009
- https://access.redhat.com/errata/RHSA-2026:16030
- https://access.redhat.com/errata/RHSA-2026:16174
- https://access.redhat.com/errata/RHSA-2026:7678
- https://access.redhat.com/errata/RHSA-2026:7682
- https://access.redhat.com/errata/RHSA-2026:8863
- https://access.redhat.com/errata/RHSA-2026:8869
- https://access.redhat.com/errata/RHSA-2026:8870
- https://access.redhat.com/errata/RHSA-2026:8871
- https://access.redhat.com/errata/RHSA-2026:8872
- https://access.redhat.com/errata/RHSA-2026:8888
- https://access.redhat.com/security/cve/CVE-2026-27622
- https://bugzilla.redhat.com/show_bug.cgi?id=2444251
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27622.json
JSON original (NVD)
Mostrar
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"value": "OpenEXR provides the specification and reference implementation of the EXR file format, an image storage format for the motion picture industry. In CompositeDeepScanLine::readPixels, per-pixel totals are accumulated in vector<unsigned int> total_sizes for attacker-controlled large counts across many parts, total_sizes[ptr] wraps modulo 2^32. overall_sample_count is then derived from wrapped totals and used in samples[channel].resize(overall_sample_count). Decode pointer setup/consumption proceeds with true sample counts, and write operations in core unpack (generic_unpack_deep_pointers) overrun the undersized composite sample buffer. This vulnerability is fixed in v3.2.6, v3.3.8, and v3.4.6."
},
{
"lang": "es",
"value": "OpenEXR proporciona la especificación y la implementación de referencia del formato de archivo EXR, un formato de almacenamiento de imágenes para la industria cinematográfica. En CompositeDeepScanLine::readPixels, los totales por píxel se acumulan en vector total_sizes para grandes recuentos controlados por el atacante en muchas partes, total_sizes[ptr] se ajusta módulo 2^32. overall_sample_count se deriva entonces de los totales ajustados y se utiliza en samples[channel].resize(overall_sample_count). La configuración/consumo del puntero de decodificación procede con recuentos de muestras verdaderos, y las operaciones de escritura en el desempaquetado central (generic_unpack_deep_pointers) desbordan el búfer de muestras compuesto de tamaño insuficiente. Esta vulnerabilidad se corrige en las versiones v3.2.6, v3.3.8 y v3.4.6."
}
],
"lastModified": "2026-07-15T02:19:08.643",
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