OpenEXR HTJ2K decoder heap buffer over-read in ht_undo_impl() (DoS)_CVE-2026-45696

{
    "lastseen": "",
    "description": "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 \u2014 it pulls width 32-bit samples from cur_line->i32[] 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 \u2014 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.",
    "published": "2026-06-18T20:31:56.603Z",
    "modified": "2026-06-18T20:31:56.603Z",
    "type": "cve",
    "title": "OpenEXR HTJ2K decoder heap buffer over-read in ht_undo_impl() (DoS)",
    "source": "GitHub_M",
    "references": "https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-gjpj-qv64-vwhf\nhttps://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.12",
    "id": "CVE-2026-45696",
    "bulletinFamily": "",
    "cwe": [
        "CWE-122"
    ],
    "cvelist": null,
    "sourceData": "AcademySoftwareFoundation openexr >= 3.4.0, < 3.4.11",
    "sourceHref": "",
    "cvss": {
        "score": 8.3,
        "severity": "HIGH",
        "vector": "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",
        "version": "4.0"
    },
    "cvss2": [],
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        "baseScore": 0,
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        "cvssV3": {
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    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "openexr",
    "version": ">= 3.4.0, < 3.4.11",
    "vendor": "AcademySoftwareFoundation",
    "ai_description": "",
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    "ai_score": 0
}