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CVE-2026-44663: OpenEXR 3.4.0‑3.4.11 allows crafted image to corrupt memory

CVE-2026-44663 · published 4 months ago

Summary

Versions 3.4.0 through 3.4.11 of OpenEXR can be tricked with a specially made EXR picture into writing data outside the program’s memory area, which could cause a crash or be abused. The problem is fixed in version 3.4.12. Update OpenEXR to 3.4.12 or later to eliminate the risk.

What to do

Update bellsoft openexr to version 3.4.13-r0.
Update openexr openexr to version 3.4.12 or later.

Affected software

Ecosystem	Vendor	Product	Affected versions
Debian:11	debian	openexr	All versions
Debian:12	debian	openexr	All versions
Debian:13	debian	openexr	All versions
Debian:14	debian	openexr	All versions
–	openexr	openexr	>= 3.4.0, < 3.4.12 `cpe:2.3:a:openexr:openexr::::::::`
Alpaquita:stream	bellsoft	openexr	>= 3.4.4-r0, < 3.4.13-r0 Fix: upgrade to 3.4.13-r0
Ubuntu:Pro:16.04:LTS	canonical	openexr	All versions

Original advisory text

OpenEXR: Integer overflow in the HTJ2K decoder leads to heap-buffer-overflow

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

https://security-tracker.debian.org/tracker/CVE-2026-44663 Vendor Advisory
https://docs.bell-sw.com/security/cves/CVE-2026-44663 Vendor Advisory
https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44663... Vendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-44663 Vendor Advisory
https://ubuntu.com/security/CVE-2026-44663 Third Party Advisory
https://www.cve.org/CVERecord?id=CVE-2026-44663 Third Party Advisory
https://github.com/AcademySoftwareFoundation/openexr/releases/tag/v3.4.12 Release Notes
https://github.com/AcademySoftwareFoundation/openexr/security/advisories/GHSA-77... Exploit Mitigation Patch Vendor Advisory
https://github.com/AcademySoftwareFoundation/openexr/pull/2403 Third Party Advisory

Fix within

Internet-facing 60 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker partial control

Severity

7.1 High

Exploitation

<1% chance of attack within 30 days

Type

CWE-190Integer Overflow

CWE-787Out-of-bounds Write

Timeline

Published18 Jun 2026

Updated29 Oct 2026

First seen18 Jun 2026

Sources

CVE-2026-44663 · NVD

DEBIAN-CVE-2026-44663 · OSV

BELL-CVE-2026-44663 · OSV

CVE-2026-44663 · OSV

GHSA-777r-f9x8-7r84 · GHSA

UBUNTU-CVE-2026-44663 · OSV

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