Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AcademySoftwareFoundation openexr — OpenEXR HTJ2K decoder heap buffer over-read in ht_undo_impl() (DoS)
AV AC AT PR UI VC VI VA CVSS EPSS %ile KEV
N L N L N N N H 8.3 .0029 21.8 —
AFFECTED
Product Versions Fixed
openexr >= 3.4.0, < 3.4.11 – —
TIMELINE
May 13 Reserved by GitHub_M
Jun 18 EXPLOIT PUBLISHED — CVE-2026-45696 (AcademySoftwareFoundation openexr). Public exploit reference added.
Jun 18 Published (CNA: GitHub_M)
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 — 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.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| May 13, 2026 | Reserved | Reserved by GitHub_M |
| June 18, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-45696 (AcademySoftwareFoundation openexr). Public exploit reference added. |
| June 18, 2026 | Published | Published (CNA: GitHub_M) |
Affected
Affected products and packages — 1 row
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|
| AcademySoftwareFoundation | openexr | — | >= 3.4.0, < 3.4.11 | — |
About this page
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-45696 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.