Bug 2548033 (CVE-2026-107678)

Summary: CVE-2026-107678 ffmpeg: ffmpeg: Denial of Service via stack exhaustion from crafted MP4 files
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
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: ---
Doc Text:
A flaw was found in FFmpeg. This vulnerability allows an attacker to cause a Denial of Service (DoS) by providing a specially crafted MP4 media file containing an excessive number of encryption metadata structures. When the application recursively frees these structures, it exhausts available stack memory and consumes excessive CPU resources, leading to a process crash.
 Story Points: ---
Clone Of: Environment:
Last Closed: Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 2549544, 2549545, 2549546, 2549547, 2549548, 2549549    
Bug Blocks:    

Description OSIDB Bzimport 2026-10-08 15:47:39 UTC 
FFmpeg through 9.0.2 contains a stack exhaustion vulnerability in av_encryption_init_info_free() in libavutil/encryption_info.c, which recursively frees AVEncryptionInitInfo linked lists built by the MOV demuxer's mov_read_pssh(). Attackers can supply a crafted MP4 file with tens of thousands of small pssh boxes to exhaust the stack and crash the process, while also causing quadratic CPU consumption.