CVE-2026-107677 FFmpeg CVE debrief

Who should care

FFmpeg users, maintainers, and developers of applications using FFmpeg's DASH demuxer functionality should assess exposure and apply patches or mitigations as needed. This includes reviewing system configurations, monitoring for unusual activity, and implementing compensating controls for exposed systems. Prioritization should focus on systems with high availability and performance requirements.

Why it matters

This denial of service vulnerability in FFmpeg's DASH demuxer could lead to resource exhaustion and impact system availability and performance. FFmpeg users and maintainers should review and apply patches or implement mitigations to prevent potential attacks.

• Potential for resource exhaustion due to infinite loop
• Possible impact on system availability and performance

Technical summary

FFmpeg through 9.0.2 contains a denial of service vulnerability in the DASH demuxer. An attacker can trigger an infinite loop by supplying an empty SegmentTemplate media URL, causing get_current_fragment() to call av_strireplace() with an empty search string, consuming CPU indefinitely. This impacts system availability and performance, particularly for FFmpeg users and maintainers. The vulnerability is grounded in the official CVE record and source item details, but may require additional verification for specific configurations.

Defensive priority

Medium priority for FFmpeg users and maintainers

Recommended defensive actions

• Review and apply patches from FFmpeg for versions up to 9.0.2
• Restrict access to DASH demuxer functionality to trusted sources
• Monitor for unusual activity in FFmpeg-based applications
• Implement compensating controls for exposed systems
• Conduct asset inventory to identify potentially affected deployments
• Track exceptions and retest remediated assets
• Review relevant monitoring, detection, and logs for exposed assets

Evidence notes

The CVE record and source item provide details on the denial of service vulnerability in FFmpeg's DASH demuxer. The vulnerability allows attackers to trigger an infinite loop by supplying an empty SegmentTemplate media URL. Evidence is limited to CVE Program and NVD records, which may not cover all potential impacts or affected configurations. Defenders should verify system exposure and apply patches or mitigations accordingly.

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.