CVE-2026-47667

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{"affected": [{"affectedData": [{"product": "CImg", "vendor": "GreycLab", "versions": [{"status": "affected", "version": "< 4.0.0"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "CImg Library is a C++ library for image processing. Prior to version 4.0.0 in `_load_analyze()`, the header_size field is read as an `unsigned int` from the first 4 bytes of an Analyze/NIfTI file and passed directly to `new unsigned char[header_size]` without being bounded against the actual file size. A value up to ~4 GB is accepted. If the subsequent `fread` returns `short` as it will for any malformed file), the function throws a `CImgIOException` and the allocated buffer is never freed. A 6-byte crafted file is sufficient to trigger an allocation of ~1.3 GB per call, with the full allocation leaked on every error path. The issue is reachable via `load_analyze()` and the generic `load()` when the file extension is .hdr, .img, or .nii. Version 4.0.0 fixes the issue."}, {"lang": "es", "value": "La Biblioteca CImg es una biblioteca de C++ para procesamiento de im\u00e1genes. Antes de la versi\u00f3n 4.0.0 en \u2019_load_analyze()\u2019, el campo header_size se lee como un \u2019unsigned int\u2019 de los primeros 4 bytes de un archivo Analyze/NIfTI y se pasa directamente a \u2019new unsigned char[header_size]\u2019 sin ser acotado contra el tama\u00f1o real del archivo. Se acepta un valor de hasta ~4 GB. Si el \u2019fread\u2019 subsiguiente devuelve \u2019short\u2019 (como ocurrir\u00e1 para cualquier archivo malformado), la funci\u00f3n lanza una \u2019CImgIOException\u2019 y el b\u00fafer asignado nunca se libera. Un archivo manipulado de 6 bytes es suficiente para activar una asignaci\u00f3n de ~1.3 GB por llamada, con la asignaci\u00f3n completa filtrada en cada ruta de error. El problema es alcanzable a trav\u00e9s de \u2019load_analyze()\u2019 y el \u2019load()\u2019 gen\u00e9rico cuando la extensi\u00f3n del archivo es .hdr, .img o .nii. La versi\u00f3n 4.0.0 soluciona el problema."}], "id": "CVE-2026-47667", "lastModified": "2026-10-24T19:10:00.127", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-47667", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-07-23T14:12:55.547375Z", "version": "2.0.3"}}]}, "published": "2026-07-21T20:17:01.323", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/GreycLab/CImg/commit/6a69bf725ffd111a4c7dc61cc15e3661abd158ee"}, {"source": "security-advisories@github.com", "url": "https://github.com/GreycLab/CImg/issues/480"}, {"source": "security-advisories@github.com", "url": "https://github.com/GreycLab/CImg/security/advisories/GHSA-rmfc-grgj-qwhv"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/GreycLab/CImg/issues/480"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}, {"lang": "en", "value": "CWE-789"}, {"lang": "en", "value": "CWE-1284"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

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