Bug 2512263 (CVE-2026-70632)

Summary:	CVE-2026-70632 ffmpeg: FFmpeg: Arbitrary Code Execution in CFHD Decoder via Crafted AVI File
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	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 out-of-bounds heap write vulnerability exists within the native GoPro CineForm HD (CFHD) decoder. A remote attacker can exploit this by providing a specially crafted AVI (Audio Video Interleave) file during stream analysis. This can lead to memory corruption and may be escalated to arbitrary code execution, allowing the attacker to run malicious code on the affected system.	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:	2519575, 2519576, 2519577, 2519579, 2519578, 2519580
Bug Blocks:

Description OSIDB Bzimport 2026-08-06 22:25:48 UTC

FFmpeg versions from 4.4 up to, but not including, 9.0 contain an out-of-bounds heap write vulnerability in the native GoPro CineForm HD (CFHD) decoder that allows remote attackers to corrupt heap memory by supplying a crafted AVI file during stream probing. The cfhd_decode() function fails to enforce the non-Bayer logical output-width invariant in the transform-type-2 reconstruction path, causing horiz_filter_clip() to write oversized 16-bit sample rows far beyond the allocated output frame buffer, which can be escalated to arbitrary code execution via overwrite of a live cleanup callback pointer.