CVE-2025-59731 Heap-buffer-overflow write in FFmpeg EXR dwa_uncompress
A heap-buffer-overflow in FFmpeg's EXR decoder allows attackers to execute arbitrary code or cause denial of service via crafted files.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2025-59731?
CVE-2025-59731 is a medium-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, the specified raw length of run-length-encoded data is not checked when using it to calculate the output data.
We read rle_raw_size from the input file at [0], we decompress and decode into the buffer td->rle_raw_data of size rle_raw_size at [1], and then at [2] we will access entries in this buffer up to (td->xsize - 1) * (td->ysize - 1) + rle_raw_size / 2, which may exceed rle_raw_size.
We recommend upgrading to version 8.0 or beyond.
Weakness: CWE-787
Which versions are affected by CVE-2025-59731?
How do I fix CVE-2025-59731?
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-2025-59731 being exploited?
There is no known exploitation of CVE-2025-59731 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2025-59731, GHSA-p7r5-qh99-qchm, JLSEC-2026-644, MINI-rcv4-m48f-797r.