CVE-2026-59984 OpenEXR: Scratch buffer overflow decoding B44-compressed InputFile on ILP32
A crafted B44-compressed EXR file can cause an out-of-bounds write in OpenEXR on ILP32 systems, leading to memory corruption and potential code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-59984?
CVE-2026-59984 is a medium-severity memory corruption vulnerability in AcademySoftwareFoundation openexr, published on 25 Aug 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
OpenEXR is the reference implementation and specification for the EXR image format, widely used in the motion picture industry. OpenEXR versions 3.1.0 through 3.2.10, 3.3.0 through 3.3.12, and 3.4.0 through 3.4.13 are vulnerable on ILP32 builds to an out-of-bounds write. When a crafted B44-compressed scanline EXR causes the logical scratch size to truncate before allocation and uncompress_b44_impl() writes using the attacker-controlled channel width, allowing denial of service and memory corruption. This issue is fixed in versions 3.2.11, 3.3.13, and 3.4.14.
Weakness: CWE-787
Which versions are affected by CVE-2026-59984?
How do I fix CVE-2026-59984?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-59984 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-59984 exists.
Sources
Also known as BELL-CVE-2026-59984, DEBIAN-CVE-2026-59984, ECHO-818f-3ecd-dadb, GHSA-92pq-9qv4-g68q, MINI-8x46-xxgj-fhp4, UBUNTU-CVE-2026-59984.