CVE-2026-107660
Received Received - Intake

Improper Certificate Validation in FFmpeg

Publication date: 2026-10-08

Last updated on: 2026-10-08

Assigner: VulnCheck

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.

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Meta Information

Published
2026-10-08
Last Modified
2026-10-08
Generated
2026-10-08
AI Q&A
2026-10-08
EPSS Evaluated
N/A
NVD
CVE-2026-107660
EUVD
EUVD-2026-95079

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
FFmpeg FFmpeg 0
FFmpeg FFmpeg 9.0

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-297 The product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host.

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Executive Summary

This vulnerability in FFmpeg before versions 8.1.3 and 9.x before 9.0.2 involves improper certificate validation in the tls_open() function of libavformat/tls_mbedtls.c. It specifically skips hostname checks for IP-address hosts, allowing network attackers to intercept secure connections like HTTPS, RTMPS, or TLS to IP-literal URLs using any trusted CA-issued certificate. This enables attackers to read and tamper with data streams.

Detection Guidance

To detect this vulnerability, check if your FFmpeg version is before 8.1.3 or 9.x before 9.0.2. Run 'ffmpeg -version' to verify the installed version. Inspect network traffic for connections to IP-literal URLs using HTTPS, RTMPS, or TLS protocols without proper hostname validation.

Impact Analysis

If you use FFmpeg versions before 8.1.3 or 9.x before 9.0.2, attackers could intercept and alter your secure streams, potentially exposing sensitive data or injecting malicious content. This affects applications relying on FFmpeg for secure media streaming or processing.

Compliance Impact

This vulnerability could lead to unauthorized access or tampering with sensitive data, violating confidentiality requirements in GDPR and HIPAA. Organizations using affected FFmpeg versions may fail compliance audits due to inadequate security controls for data in transit.

Mitigation Strategies

Upgrade FFmpeg to version 8.1.3 or 9.0.2 or later. Ensure all FFmpeg-based applications use updated libraries. Review and update network configurations to avoid IP-literal URLs in TLS connections. Monitor for unusual network traffic or certificate validation failures.

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