CVE-2026-68513 OpenEXR: Heap buffer overflow in PyOpenEXR from literal/prefixed RGB channel name collision
Heap buffer overflow in PyOpenEXR allows attackers to execute code or crash applications via crafted EXR files with colliding channel names.
- 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-2026-68513?
CVE-2026-68513 is a high-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. Versions 3.3.0 through 3.3.12 and 3.4.0 through 3.4.13 contain a heap buffer overflow in PyOpenEXR triggered by a channel-name key collision between literal and prefixed RGB channels. When separate_channels=false, PyOpenEXR maps each physical channel name through channelNameToRGBA() and coalesces the results into a shared RGB array. A crafted flat scanline EXR that contains both a literal channel such as left and prefixed channels such as left.R, left.G, and left.B causes these names to collide, so the wrapper reuses an undersized two-dimensional NumPy array for the coalesced RGB slices and writes out of bounds when OpenEXR.File(path) decodes the pixels. This issue is fixed in versions 3.3.13 and 3.4.14.
Which versions are affected by CVE-2026-68513?
How do I fix CVE-2026-68513?
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-2026-68513 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-68513 exists.
Sources
Also known as BELL-CVE-2026-68513, DEBIAN-CVE-2026-68513, GHSA-rw5h-3q4v-c3vc, MINI-77m7-j457-6v4j, UBUNTU-CVE-2026-68513.