High severity7.8NVD Advisory· Published Nov 9, 2026
CVE-2026-125209
CVE-2026-125209
Description
FFmpeg before 8.1.3 and 9.x before 9.0.2 contains a heap buffer overflow vulnerability in the DVD subtitle encoder that underestimates RLE output size for odd-width rectangles. Attackers can supply files with crafted bitmap subtitles that, when transcoded to the dvdsub encoder, write past the output buffer and corrupt heap memory.
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Affected products
1Patches
Vulnerability mechanics
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