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: Integer overflow in the HTJ2K decoder leads to heap-buffer-overflow
AV AC PR UI S C I A CVSS EPSS %ile KEV
L L N R U N H H 7.1 .0020 10.1 —
AFFECTED
Product Versions Fixed
openexr >= 3.4.0, < 3.4.11 – —
TIMELINE
May 7 Reserved by GitHub_M
Jun 18 EXPLOIT PUBLISHED — CVE-2026-44663 (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, an integer overflow in ht_undo_impl() in src/lib/OpenEXRCore/internal_ht.cpp leads to a heap-buffer overflow when decoding a crafted HTJ2K-compressed EXR file. decode->channels[i].width (int32_t) is multiplied by bytes_per_element in 32-bit signed arithmetic. With large widths (e.g., >= 536870912 for FLOAT data), this overflows, producing a corrupted offset that is later used for pointer arithmetic and can cause a heap out-of-bounds write. The same unchecked multiplication pattern appears in two other HTJ2K paths (bytes-per-line accumulation and pixel-line pointer advancement). As with related CVE-2026-34378 through CVE-2026-34589 fixes in other codecs, validating only after the multiplication is too late because the value may already be overflowed. This issue has been fixed in version 3.4.12.
Lifecycle
Complete event history — 3 events, chronological
| Date | Event | Detail |
|---|
| May 7, 2026 | Reserved | Reserved by GitHub_M |
| June 18, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-44663 (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-2026-44663 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.