CVE-2026-75142 FFmpeg CVE debrief

Who should care

Defenders responsible for maintaining and securing FFmpeg installations should be aware of this vulnerability. This includes developers, system administrators, and security teams that use or manage FFmpeg in their environments.

Why it matters

Defenders should prioritize verifying and applying the patch to prevent potential buffer overflows. Reviewing and updating FFmpeg installations to ensure they are using a version with the fix is crucial. The vulnerability's impact is limited by the lack of information on affected versions and potential exploitation.

• Potential buffer overflow during MPEG-PS muxing
• Verification of patch application is necessary to prevent exploitation
• Reviewing FFmpeg installations for outdated versions is crucial
• Monitoring for crafted inputs that could trigger the buffer overflow is recommended

Technical summary

The vulnerability exists in the MPEG-PS muxer (libavformat/mpegenc.c) of FFmpeg before commit 9d786e4. A stack buffer overflow occurs when muxing input with more streams than the muxer's fixed-size stack buffer accommodates. A crafted input with an excessive number of streams triggers the overflow during MPEG-PS muxing. This issue can be addressed by verifying and applying the patch (commit 9d786e4) to prevent potential buffer overflows. Reviewing and updating FFmpeg installations to ensure they are using a version with the fix is crucial.

Defensive priority

Defenders should prioritize verifying and applying the patch (commit 9d786e4) to prevent potential buffer overflows. Reviewing and updating FFmpeg installations to ensure they are using a version with the fix is crucial.

Recommended defensive actions

• Verify and apply the patch (commit 9d786e4) to FFmpeg installations
• Review and update FFmpeg installations to ensure they are using a version with the fix
• Monitor for potential crafted inputs that could trigger the buffer overflow
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details about the vulnerability, including its description and CVSS score. However, additional information about affected versions and potential exploitation is limited.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.