High
openexr — security advisory
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->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 — 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.
- Products
- openexr
- Affected versions
- 2.2.0-10ubuntu2, 2.2.0-10ubuntu2.1, 2.2.0-10ubuntu2.2, 2.2.0-10ubuntu2.3, 2.2.0-10ubuntu2.4, 2.2.0-10ubuntu2.6, 2.2.0-10ubuntu2.6+esm1, 2.2.0-10ubuntu2.6+esm2, 2.2.0-10ubuntu2.6+esm3, 2.2.0-10ubuntu2.6+esm4, 2.2.0-11.1ubuntu1, 2.2.0-11.1ubuntu1.1, 2.2.0-11.1ubuntu1.2, 2.2.0-11.1ubuntu1.3, 2.2.0-11.1ubuntu1.4, 2.2.0-11.1ubuntu1.6, 2.2.0-11.1ubuntu1.7, 2.2.0-11.1ubuntu1.8, 2.2.0-11.1ubuntu1.9, 2.2.0-11.1ubuntu1.9+esm1, 2.2.0-11ubuntu1, 2.2.0-1ubuntu3, 2.2.0-7ubuntu1, 2.2.0-9ubuntu1, 2.2.1-4.1ubuntu1, 2.3.0-6, 2.3.0-6build1, 2.3.0-6ubuntu0.1, 2.3.0-6ubuntu0.2, 2.3.0-6ubuntu0.3, 2.3.0-6ubuntu0.5, 2.3.0-6ubuntu0.5+esm1, 2.3.0-6ubuntu0.5+esm2, 2.5.4-2, 2.5.7-1, 2.5.7-1ubuntu0.1~esm1, 2.5.7-1ubuntu0.1~esm2, 3.1.13-2, 3.1.13-2build1, 3.1.13-2ubuntu0.26.04.1~esm1, 3.1.5-5.1, 3.1.5-5.1build1, 3.1.5-5.1build2, 3.1.5-5.1build3, 3.1.5-5.1ubuntu0.1~esm1, 3.4.6+ds-4ubuntu3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-45696
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:14 UTC · Revision 1
Source evidence
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->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 — 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.
osv:UBUNTU-CVE-2026-45696
openexr
Fixed versions: Not specified
openexr
Fixed versions: Not specified
openexr
Fixed versions: Not specified
openexr
Fixed versions: Not specified
openexr
Fixed versions: Not specified
openexr
Fixed versions: Not specified
openexr
Fixed versions: Not specified
openexr
Fixed versions: Not specified
Complete source record
{
"id": "44b4e1549d64cbf6ce1213a691f74fc7d46b111c18e42822f06bdb4037621108",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-45696",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-45696",
"summary": "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->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 — 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.",
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],
"modified": "2026-10-17T12:58:22.885289103Z",
"provider": "osv",
"upstream": [
"CVE-2026-45696"
],
"references": [
"https://ubuntu.com/security/CVE-2026-45696",
"https://www.cve.org/CVERecord?id=CVE-2026-45696",
"https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-gjpj-qv64-vwhf",
"https://github.com/AcademySoftwareFoundation/openexr/pull/2397",
"https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.12"
]
},
"related_cves": [
{
"value": "CVE-2026-45696",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 358634,
"published_at": "2026-06-18T21:16:00+00:00"
}