CVE-2026-125182 · Package
NO FIX YET · SEE WHAT TO DO
FFmpeg through 9.0.2 fails to validate a Cook decoder field, so a crafted RealMedia file can read past a buffer. The read leaks pointers and decoder state into decoded audio, which can help an attacker defeat address randomization.
first public Nov 9, 2026 · 1 source
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Systems that run FFmpeg and decode RealMedia files supplied by outside users, such as media conversion services or upload pipelines. Local use on trusted files is much lower risk. unknown whether the sources name a specific fixed release.
Not affected if no-realmedia-decoding, trusted-input-only
Who cares ffmpeg, media-processing, realmedia
ffmpeg -version; versions through 9.0.2 are in the affected range..rm, .ra) files from untrusted sources, such as upload or transcoding pipelines.FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the Cook decoder joint_decode() function because cook_decode_init() does not check js_subband_start against subbands. Attackers can supply a crafted RealMedia file whose extradata causes reads past decode_buffer_0, leaking pointers and decoder state into decoded audio to help defeat ASLR.
This page as .md · .json · CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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