What’s Vulnerable › Vulnerabilities

CVE-2023-6601: Ffmpeg: hls unsafe file extension bypass in ffmpeg

• Severity: medium (CVSS 4.7 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-01-06 · updated 2026-06-17
• Weakness: CWE-99

Description

A flaw was found in FFmpeg's HLS demuxer. This vulnerability allows bypassing unsafe file extension checks and triggering arbitrary demuxers via base64-encoded data URIs appended with specific file extensions.

Affected products

• FFmpeg: from 2.0 through 6.0

References

• https://bugzilla.redhat.com/show_bug.cgi?id=2253172
• https://lists.debian.org/debian-lts-announce/2025/07/msg00004.html

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