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CVE-2025-12343: Ffmpeg: double-free vulnerability in ffmpeg tensorflow dnn backend

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-18 · updated 2026-06-17
• Weakness: CWE-415

Description

A flaw was found in FFmpeg’s TensorFlow backend within the libavfilter/dnn_backend_tf.c source file. The issue occurs in the dnn_execute_model_tf() function, where a task object is freed multiple times in certain error-handling paths. This redundant memory deallocation can lead to a double-free condition, potentially causing FFmpeg or any application using it to crash when processing TensorFlow-based DNN models. This results in a denial-of-service scenario but does not allow arbitrary code execution under normal conditions.

Affected products

• FFmpeg: from 6.1 before 8.1 — fixed in 8.1

How to fix

Upgrade to a fixed version: FFmpeg 8.1. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/security/cve/CVE-2025-12343
• https://bugzilla.redhat.com/show_bug.cgi?id=2406533

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