High severity7.0NVD Advisory· Published Nov 9, 2026
CVE-2026-125218
CVE-2026-125218
Description
FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in the APNG encoder's encode_apng() function in libavcodec/pngenc.c when frame size changes mid-stream. Attackers can supply crafted media whose resolution grows mid-stream, causing APNG_DISPOSE_OP_BACKGROUND memset writes past prev_frame and crashing or corrupting heap memory in transcoding applications.
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Affected products
1Patches
Vulnerability mechanics
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