Is CVE-2026-44663 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-44663 being exploited in the wild.

How severe is CVE-2026-44663?

Medium severity, with a CVSS score of 6.1, published 18 June 2026.

Which products and versions are affected?

AcademySoftwareFoundation OpenEXR 3.4.0 through 3.4.11.

Is there a fix for CVE-2026-44663?

A patch was published on 2026-05-25: Fixed in version 3.4.12 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-44663 attacked?

It is attacked with local access, in a software library.

Am I affected by CVE-2026-44663?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-44663: AcademySoftwareFoundation OpenEXR integer overflow in HTJ2K decoder

CVE-2026-44663 · Severity: medium · CVSS 6.1 · Published 2026-06-18

OpenEXR is a standard library used in the motion picture industry for handling high-quality image files. A vulnerability in its image decoding component allows a specially crafted image file to cause a memory error. If a user opens such a file, it could lead to an application crash or potentially allow an attacker to gain unauthorized control over the system.

Quick answers

Is CVE-2026-44663 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-44663 being exploited in the wild.
How severe is CVE-2026-44663?: Medium severity, with a CVSS score of 6.1, published 18 June 2026.
Which products and versions are affected?: AcademySoftwareFoundation OpenEXR 3.4.0 through 3.4.11.
Is there a fix for CVE-2026-44663?: A patch was published on 2026-05-25: Fixed in version 3.4.12 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-44663 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-44663?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An integer overflow exists in the ht_undo_impl() function within src/lib/OpenEXRCore/internal_ht.cpp. The vulnerability is caused by 32-bit signed arithmetic when multiplying a channel's width (int32_t) by its bytes_per_element. When processing FLOAT data with widths exceeding 536,870,912, the resulting product overflows INT32_MAX, leading to a corrupted offset used in pointer arithmetic. This results in a heap-based out-of-bounds write during the decompression of HTJ2K-compressed EXR files. The issue is present in three distinct paths within the HTJ2K decoder: raster line offset calculation, bytes-per-line accumulation, and pixel-line pointer advancement. The vulnerability has been addressed in version 3.4.12 by casting operands to 64-bit integers before multiplication.

Affected products

AcademySoftwareFoundation OpenEXR 3.4.0 through 3.4.11

Timeline

2026-05-25: patched: Fixed in version 3.4.12
2026-05-25: advisory: GitHub Security Advisory GHSA-777r-f9x8-7r84 published
2026-06-18: disclosed: CVE-2026-44663 published to NVD

References

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