CVE-2025-59732 Heap-buffer-overflow write in FFmpeg EXR dwa_uncompress
Heap buffer overflow in FFmpeg's EXR decoder allows attackers to corrupt memory and potentially execute code via crafted images.
- 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-2025-59732?
CVE-2025-59732 is a high-severity memory corruption vulnerability in FFmpeg, published on 6 Oct 2025. 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
When decoding an OpenEXR file that uses DWAA or DWAB compression, there's an implicit assumption that the height and width are divisible by 8.
If the height or width of the image is not divisible by 8, the copy loops at [0] and [1] will continue to write until the next multiple of 8.
The buffer td->uncompressed_data is allocated in decode_block based on the precise height and width of the image, so the "rounded-up" multiple of 8 in the copy loop can exceed the buffer bounds, and the write block starting at [2] can corrupt following heap memory.
We recommend upgrading to version 8.0 or beyond.
Weakness: CWE-787
Which versions are affected by CVE-2025-59732?
How do I fix CVE-2025-59732?
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-2025-59732 being exploited?
There is no known exploitation of CVE-2025-59732 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-59732, GHSA-qr3p-83wm-px3f, JLSEC-2026-645, MINI-h999-qfw2-jwv8.