# CVE-2026-125258: FFmpeg division by zero in dovi_configure_ext

Source: https://junglewise.ai/threats/cve-2026-125258-ffmpeg-through-9-0-2-contains-a-division-by-zero-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-09. Updated: 2026-11-09  
License: CC BY 4.0 with a link back

CVE-2026-125258 · Severity: medium · CVSS 4.7 · Published 2026-11-09

FFmpeg is a widely-used multimedia processing library that encodes and decodes audio and video. A crafted video file can cause FFmpeg to crash when processing HEVC or AV1 video with Dolby Vision encoding, disrupting video transcoding pipelines and services that rely on FFmpeg for media processing.

Technologies: [Ffmpeg](https://junglewise.ai/threats/technologies/ffmpeg). Vendors: [Ffmpeg](https://junglewise.ai/threats/vendors/ffmpeg).

## Quick answers

**Is CVE-2026-125258 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-125258 being exploited in the wild.

**How severe is CVE-2026-125258?** Medium severity, with a CVSS score of 4.7, published 9 November 2026.

**Which products and versions are affected?** Ffmpeg through 9.0.2.

**Is there a fix for CVE-2026-125258?** Yes: fixed in FFmpeg 9.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-125258 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-125258?** Check whether you run Ffmpeg at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in FFmpeg 9.1

## Technical details

The vulnerability is a division-by-zero in dovi_configure_ext() in libavcodec/dovi_rpuenc.c triggered by an unvalidated zero frame rate denominator. An attacker supplies a crafted HEVC or AV1 input with a nonzero numerator and zero denominator to the dovi_rpu bitstream filter or encoders (libx265, libaom, libsvtav1), causing process termination. The fix validates the denominator before division.

## Affected products

- FFmpeg FFmpeg through 9.0.2

## Timeline

- 2026-11-09: disclosed: CVE-2026-125258 published
- 2026-11-06: patched: Fix merged in PR #25408

## References

- [https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25408](https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/25408)
- [https://github.com/FFmpeg/FFmpeg](https://github.com/FFmpeg/FFmpeg)

## Related threats

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- [FFmpeg double free in H.264 SEI message handling](https://junglewise.ai/threats/cve-2026-125269-ffmpeg-through-9-0-2-contains-a-double-free-vulnerability-in)
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- [FFmpeg use-after-free in NVIDIA codec decoding](https://junglewise.ai/threats/cve-2026-125265-ffmpeg-through-9-0-2-contains-a-use-after-free-vulnerability-in)
- [FFmpeg JPEG XL parser uncontrolled resource consumption](https://junglewise.ai/threats/cve-2026-125264-ffmpeg-through-9-0-2-contains-an-uncontrolled-resource)