Bug 2570789 (CVE-2026-125182)

Summary: CVE-2026-125182 ffmpeg: ffmpeg: Information disclosure via crafted RealMedia file in Cook decoder
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: bbrownin
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in ffmpeg. An out-of-bounds read vulnerability in the Cook audio decoder allows an attacker to cause information disclosure by tricking an application or user into processing a specially crafted RealMedia file. Successful exploitation causes memory reads beyond intended boundaries, leaking internal memory pointers and decoder state into the output audio, which can help bypass security mitigations such as Address Space Layout Randomization (ASLR).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-11-10 20:22:24 UTC 
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.