{"id":"JLSEC-2026-944","summary":"ImageMagick has heap-buffer-overflow via signed integer overflow in WriteUHDRImage when writing UHDR images with large dimensions","details":"`WriteUHDRImage` in `coders/uhdr.c` uses `int` arithmetic to compute the pixel buffer size. When image dimensions are large, the multiplication overflows 32-bit `int`, causing an undersized heap allocation followed by an out-of-bounds write. This can crash the process or potentially lead to an out of bounds heap write.\n\n```\n==1575126==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x7fc382ef3820 at pc 0x5560d31f229f bp 0x7ffe865f9530 sp 0x7ffe865f9520\nWRITE of size 8 at 0x7fc382ef3820 thread T0\n    #0 0x5560d31f229e in WriteUHDRImage coders/uhdr.c:807\n```","modified":"2026-07-30T18:35:51.153060099Z","published":"2026-07-30T16:02:27.435Z","upstream":["CVE-2026-25794","EUVD-2026-7448","GHSA-vhqj-f5cj-9x8h"],"database_specific":{"sources":[{"imported":"2026-07-30T14:08:44.882Z","modified":"2026-07-15T02:18:56.947Z","published":"2026-02-24T01:16:13.970Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-25794","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25794","database_specific":{"status":"Modified"},"id":"CVE-2026-25794"},{"imported":"2026-07-30T14:10:02.570Z","modified":"2026-04-08T16:26:24Z","published":"2026-02-24T15:31:57Z","url":"https://api.github.com/advisories/GHSA-vhqj-f5cj-9x8h","html_url":"https://github.com/advisories/GHSA-vhqj-f5cj-9x8h","id":"GHSA-vhqj-f5cj-9x8h"},{"published":"2026-02-24T00:53:23Z","url":"https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-7448","html_url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-7448","id":"EUVD-2026-7448","imported":"2026-07-30T14:08:51.295Z","modified":"2026-07-15T01:15:58Z"}],"license":"CC-BY-4.0"},"references":[{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-25794"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2442110"},{"type":"WEB","url":"https://github.com/ImageMagick/ImageMagick/commit/ffe589df5ff8ce1433daa4ccb0d2a9fadfbe30ed"},{"type":"WEB","url":"https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-vhqj-f5cj-9x8h"},{"type":"WEB","url":"https://github.com/advisories/GHSA-vhqj-f5cj-9x8h"},{"type":"WEB","url":"https://github.com/dlemstra/Magick.NET/releases/tag/14.10.3"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-25794"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25794.json"}],"affected":[{"package":{"name":"ImageMagick_jll","ecosystem":"Julia","purl":"pkg:julia/ImageMagick_jll?uuid=c73af94c-d91f-53ed-93a7-00f77d67a9d7"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"7.1.2023+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-944.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:L/I:N/A:H"}],"credits":[{"name":"ylwango613","contact":["https://github.com/ylwango613"],"type":"REPORTER"}]}