{"id":"JLSEC-2026-813","summary":"Crafted HTJ2K compressed EXR files can trigger out of bounds reads in OpenEXR","details":"OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. In versions 3.4.0 through 3.4.11, the HTJ2K (High-Throughput JPEG 2000) decoder, `ht_undo_impl()` in OpenEXRCore is vulnerable to a heap-buffer-overflow READ. The  `ht_undo_imp` function copies decoded pixels out of a per-line OpenJPH buffer using the EXR channel's declared width as the iteration count. The codestream embedded in the EXR chunk can declare different (smaller) tile/line dimensions than the EXR header advertises, but `ht_undo_impl()` does not validate this — it pulls width 32-bit samples from `cur_line-`\u003ei32[] without checking the OpenJPH line buffer's actual length. A crafted EXR file produces a 4-byte heap-buffer-overflow READ immediately after a buffer allocated by `ojph::local::codestream::finalize_alloc()`. The bug is reachable through the standard scanline-decode entry point used by every consumer of `exr_decoding_run/Imf::checkOpenEXRFile`, including thumbnailers, asset pipelines, and the exrcheck utility — i.e. any application that opens untrusted EXR files. The result is a deterministic crash (DoS) and potential adjacent-heap leak. This issue has been fixed in version 3.4.12.","modified":"2026-07-29T14:30:03.948928499Z","published":"2026-07-29T14:18:08.707Z","upstream":["CVE-2026-45696"],"database_specific":{"license":"CC-BY-4.0","sources":[{"published":"2026-06-18T21:16:28.917Z","url":"https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-45696","html_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45696","database_specific":{"status":"Modified"},"id":"CVE-2026-45696","imported":"2026-07-29T13:22:21.174Z","modified":"2026-07-15T02:22:05.827Z"}]},"references":[{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-45696"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2490597"},{"type":"WEB","url":"https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.12"},{"type":"WEB","url":"https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-gjpj-qv64-vwhf"},{"type":"WEB","url":"https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-gjpj-qv64-vwhf"},{"type":"WEB","url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-45696.json"}],"affected":[{"package":{"name":"OpenEXR_jll","ecosystem":"Julia","purl":"pkg:julia/OpenEXR_jll?uuid=18a262bb-aa17-5467-a713-aee519bc75cb"},"ranges":[{"type":"SEMVER","events":[{"introduced":"3.4.4+0"},{"fixed":"3.4.12+0"}]}],"database_specific":{"source":"https://github.com/JuliaLang/SecurityAdvisories.jl/tree/generated/osv/2026/JLSEC-2026-813.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/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"}]}