{"id":"UBUNTU-CVE-2026-47667","details":"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.","modified":"2026-07-29T10:18:35.221122236Z","published":"2026-07-21T20:17:00Z","upstream":["CVE-2026-47667"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-47667"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-47667"},{"type":"REPORT","url":"https://github.com/GreycLab/CImg/security/advisories/GHSA-rmfc-grgj-qwhv"},{"type":"REPORT","url":"https://github.com/GreycLab/CImg/issues/480"}],"affected":[{"package":{"name":"cimg","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/cimg?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.6.4+dfsg-1build1","1.6.5+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"cimg-examples","binary_version":"1.6.5+dfsg-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47667.json"}},{"package":{"name":"cimg","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/cimg?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.9+dfsg-2","1.7.9+dfsg-2build1","1.7.9+dfsg-2ubuntu0.18.04.1","1.7.9+dfsg-2ubuntu0.18.04.2","1.7.9+dfsg-2ubuntu0.18.04.2+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"cimg-examples","binary_version":"1.7.9+dfsg-2ubuntu0.18.04.2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47667.json"}},{"package":{"name":"cimg","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/cimg?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.4.5+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.4.5+dfsg-1","binary_name":"cimg-examples"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47667.json"}},{"package":{"name":"cimg","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/cimg?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.9.4+dfsg-2","2.9.4+dfsg-3","2.9.4+dfsg-3ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"cimg-examples","binary_version":"2.9.4+dfsg-3ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47667.json"}},{"package":{"name":"cimg","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/cimg?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.2.1+dfsg-1","3.2.1+dfsg-1ubuntu0.24.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"3.2.1+dfsg-1ubuntu0.24.04.1~esm1","binary_name":"cimg-examples"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47667.json"}},{"package":{"name":"cimg","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/cimg?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.5.2+dfsg-1","3.5.2+dfsg-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"cimg-examples","binary_version":"3.5.2+dfsg-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-47667.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}