What’s Vulnerable › Vulnerabilities

CVE-2026-107660: FFmpeg before 8.1.3 and 9.x before 9.0.2 mbedTLS Hostname Verification Bypass for IP Hosts

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-08 · updated 2026-10-14
• Weakness: CWE-297

Description

FFmpeg before 8.1.3 and 9.x before 9.0.2 contains an improper certificate validation vulnerability in tls_open() of libavformat/tls_mbedtls.c, which skips hostname checks for IP-address hosts. Network attackers can intercept https, rtmps, or tls connections to IP-literal URLs with any trusted CA-issued certificate to read and tamper with streams.

Affected products

• FFmpeg: before 8.1.3; from 9.0 before 9.0.2 — fixed in 8.1.3, 9.0.2

How to fix

Upgrade to a fixed version: FFmpeg 8.1.3, 9.0.2. Check the vendor advisory for mitigations.

References

• https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/0cd2a70eacd510c2efed48b9fc177c7cb2bc549f
• https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/57a2e704b4a6eda5d061b45aacde6b19c026bfc0
• https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/d377212904a19fc740d721cbda0ba58fa3805a29
• https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24383
• https://ffmpeg.org/
• https://github.com/FFmpeg/FFmpeg/blob/n9.0.1/libavformat/tls_mbedtls.c#L676-L681
• https://www.vulncheck.com/advisories/ffmpeg-before-8.1.3-and-9-x-before-9.0.2-mbedtls-hostname-verification-bypass-for-ip-hosts

Get alerted when CVE-2026-107660 or the next vulnerability affects your stack