Bug 2458764 (CVE-2026-6385)

Summary:	CVE-2026-6385 ffmpeg: FFmpeg: Denial of Service and potential arbitrary code execution via signed integer overflow in DVD subtitle parser
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	alinfoot, bbrownin, dtrifiro, ebourniv, fnfgame938, hasun, jkoehler, lgallett, lphiri, nyancey, ptisnovs, rbryant, sbunciak, weaton
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in FFmpeg. A remote attacker could exploit this vulnerability by providing a specially crafted MPEG-PS/VOB media file containing a malicious DVD subtitle stream. This vulnerability is caused by a signed integer overflow in the DVD subtitle parser's fragment reassembly bounds checks, leading to a heap out-of-bounds write. Successful exploitation can result in a denial of service (DoS) due to an application crash, and potentially lead to arbitrary code execution.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
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Description OSIDB Bzimport 2026-04-15 19:13:35 UTC

A flaw was found in FFmpeg. A remote attacker could exploit this vulnerability by providing a specially crafted MPEG-PS/VOB media file containing a malicious DVD subtitle stream. This vulnerability is caused by a signed integer overflow in the DVD subtitle parser's fragment reassembly bounds checks, leading to a heap out-of-bounds write. Successful exploitation can result in a denial of service (DoS) due to an application crash, and potentially lead to arbitrary code execution.

Comment 2 Thaddeus Jorvik 2026-04-27 04:09:22 UTC

Make sure you’re on a patched FFmpeg build since this is a parser level issue and hard to mitigate otherwise. Are you sanitizing or rejecting untrusted media inputs before processing?

Comment 3 Thaddeus Jorvik 2026-05-04 03:10:48 UTC

I’m currently relying on the default FFmpeg build, so I’ll check if it’s patched. For now I’m not doing strict sanitization, just basic validation, do you recommend rejecting unsupported formats upfront?
https://fnf-games.io