CVE-2026-44663
MEDIUMCVSS v3.1: 6.1 · EPSS: 0.0017 (6.7 percentile)
Source data as of:
At a glance
- Severity
- MEDIUM
- CVSS
- 6.1 v3.1 · NVD
- EPSS
- 0.0017 (6.7 percentile) · FIRST.org
- CISA KEV
- No
- Type
- Integer Overflow, Out-of-bounds Write · NVD CWE
- Attack conditions (CVSS vector)
- No privileges · Source: NVD Vector
- Affected vendors
- openexr
- Published
- 2026-06-18 · Modified: 2026-06-26
- References
- Jump to references (2)
CVSS / EPSS / KEV
Source — CVSS: NVD · EPSS: FIRST.org · KEV: CISA. Data & Sources
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.
References
Reference URLs as listed by NVD, grouped by a mechanical match on the link's host/pattern. Labels describe the link type only.