CVE-2026-55373

{"id": "CVE-2026-55373", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-55373", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-08-25T13:37:26.507149Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.2, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 2.5}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "AcademySoftwareFoundation", "product": "openexr", "versions": [{"status": "affected", "version": "< 3.2.10"}, {"status": "affected", "version": ">= 3.3.0, < 3.3.12"}, {"status": "affected", "version": ">= 3.4.0, < 3.4.13"}]}]}], "published": "2026-08-25T01:16:36.947", "references": [{"url": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-mff9-68x3-h8rh", "source": "security-advisories@github.com"}, {"url": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-mff9-68x3-h8rh", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Deferred", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-190"}, {"lang": "en", "value": "CWE-400"}, {"lang": "en", "value": "CWE-835"}]}], "descriptions": [{"lang": "en", "value": "OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. Versions prior to 3.2.10, 3.3.12, and 3.4.13 contain an infinite-loop vulnerability in SampleCountChannel. The helper roundListSizeUp() rounds a sample-list size up to the next power of two using repeated unsigned left shifts, which terminates for normal values but fails for UINT_MAX: the sequence reaches 0x80000000, and the next left shift wraps the 32-bit value to 0. Because 0 remains less than UINT_MAX, the loop never progresses and never exits. The bug is reachable through public OpenEXRUtil APIs, either by editing the sample-count buffer through SampleCountChannel::Edit (whose destructor calls endEdit()) or by calling SampleCountChannel::set(x, y, UINT_MAX) on a valid pixel. This issue has been fixed in versions 3.2.10, 3.3.12, and 3.4.13."}, {"lang": "es", "value": "OpenEXR es la implementaci\u00f3n de referencia y especificaci\u00f3n para el formato de imagen EXR, ampliamente utilizado en la industria cinematogr\u00e1fica. Las versiones anteriores a la 3.2.10, 3.3.12 y 3.4.13 contienen una vulnerabilidad de bucle infinito en SampleCountChannel. La funci\u00f3n auxiliar roundListSizeUp() redondea el tama\u00f1o de una lista de muestras a la siguiente potencia de dos utilizando desplazamientos a la izquierda sin signo repetidos, lo que termina para valores normales pero falla para UINT_MAX: la secuencia alcanza 0x80000000, y el siguiente desplazamiento a la izquierda envuelve el valor de 32 bits a 0. Debido a que 0 permanece menor que UINT_MAX, el bucle nunca progresa y nunca sale. El error es alcanzable a trav\u00e9s de las API p\u00fablicas de OpenEXRUtil, ya sea editando el b\u00fafer de recuento de muestras a trav\u00e9s de SampleCountChannel::Edit (cuando destructor llama a endEdit()) o llamando a SampleCountChannel::set(x, y, UINT_MAX) en un p\u00edxel v\u00e1lido. Este problema ha sido solucionado en las versiones 3.2.10, 3.3.12 y 3.4.13."}], "lastModified": "2026-10-12T15:10:00.207", "sourceIdentifier": "security-advisories@github.com"}