Is CVE-2026-125267 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-125267 being exploited in the wild.

How severe is CVE-2026-125267?

High severity, with a CVSS score of 7.8, published 9 November 2026.

Which products and versions are affected?

Ffmpeg before 8.1.3 and 9.x before 9.0.2.

Is there a fix for CVE-2026-125267?

Yes: fixed in FFmpeg 8.1.3, 9.0.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-125267 attacked?

It is attacked with local access, in a software library.

Am I affected by CVE-2026-125267?

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.

CVE-2026-125267: FFmpeg heap out-of-bounds write in APAC decoder

CVE-2026-125267 · Severity: high · CVSS 7.8 · Published 2026-11-09

FFmpeg is a multimedia processing framework used to encode, decode, and transcode audio and video. A flaw in the APAC audio decoder allows an attacker to supply a malicious audio file that causes heap memory corruption or crashes the application during playback or transcoding operations.

Technologies: Ffmpeg. Vendors: Ffmpeg.

Quick answers

Is CVE-2026-125267 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-125267 being exploited in the wild.
How severe is CVE-2026-125267?: High severity, with a CVSS score of 7.8, published 9 November 2026.
Which products and versions are affected?: Ffmpeg before 8.1.3 and 9.x before 9.0.2.
Is there a fix for CVE-2026-125267?: Yes: fixed in FFmpeg 8.1.3, 9.0.2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-125267 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-125267?: 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 8.1.3, 9.0.2

Technical details

The APAC decoder in libavcodec/apac.c fails to reset the bitstream_index variable, allowing it to accumulate unchecked across packets. A crafted APAC file can trigger an integer overflow in the bitstream_index when adding the next buffer size, bypassing the reallocation bounds check and causing memcpy() to write beyond allocated heap memory or crash the process.

Affected products

FFmpeg FFmpeg before 8.1.3 and 9.x before 9.0.2

Timeline

2026-11-09: disclosed
2026-09-12: patched

References

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