Bug 2569595 (CVE-2026-125187)

Summary: CVE-2026-125187 ffmpeg: ffmpeg: Denial of Service via assertion failure in TTA encoder
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
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 attacker could cause a Denial of Service (DoS) by providing specially crafted audio input to be transcoded into the True Audio (TTA) format. Because the encoder fails to reserve adequate buffer space for checksum data, processing specific audio samples triggers an internal assertion failure, leading to an immediate application crash.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-11-10 13:09:36 UTC 
FFmpeg through 9.0.2 contains a reachable assertion vulnerability in the TTA encoder's tta_encode_frame() in libavcodec/ttaenc.c, which never reserves output packet space for the 4-byte CRC. Attackers can supply audio whose sample values and length produce a small, poorly compressible final frame, triggering the av_assert0() in flush_put_bits() and aborting applications transcoding to TTA.