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FFmpeg CVE-2026-65704

| EUVDEUVD-2026-48371 HIGH
Out-of-bounds Write (CWE-787)
2026-07-23 VulnCheck GHSA-98cx-cw6c-5pj4
Buffer Overflow Memory Corruption Ffmpeg
7.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
7.3 HIGH
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.8 HIGH

Local file processing with victim interaction (AV:L/UI:R), no privileges needed (PR:N), and heap corruption enabling code execution justifies High C/I/A.

3.1 AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
4.0 AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
6.1 MEDIUM
AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:H
Red Hat
5.5 MEDIUM
qualitative

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
P
Scope
X

Lifecycle Timeline

2
Analysis Generated
Jul 23, 2026 - 19:47 vuln.today
CVE Published
Jul 23, 2026 - 18:55 cve.org
HIGH 7.3

DescriptionCVE.org

FFmpeg through 8.1.2 contains an out-of-bounds write vulnerability that allows attackers to cause heap corruption by supplying a crafted ffconcat file processed with the -safe 0 flag. The TY demuxer's demux_audio() function decrements packet size without bounds checking, producing a negative size value that is passed to memcpy() in shorten_decode_frame(), where conversion to size_t wraps the value to near SIZE_MAX and triggers reads beyond the source allocation and writes far beyond the Shorten decoder's bitstream buffer.

AnalysisAI

Out-of-bounds heap write in FFmpeg through 8.1.2 lets an attacker who supplies a crafted ffconcat file - processed with the -safe 0 flag - corrupt heap memory and potentially achieve code execution. The flaw chains the TY demuxer's demux_audio() (which decrements packet size without bounds checking) into the Shorten decoder's memcpy(), where a negative size wraps to near SIZE_MAX. Reported by VulnCheck with a vendor patch available; no public exploit identified at time of analysis.

Technical ContextAI

FFmpeg is the de facto multimedia framework used for decoding, encoding, and transcoding audio/video across countless applications, servers, and OS distributions (CPE cpe:2.3:a:ffmpeg:ffmpeg:*). The bug is a CWE-787 out-of-bounds write rooted in an integer/signedness error: the TY demuxer's demux_audio() subtracts from a packet size field without validating the result stays non-negative, yielding a negative int. That value is later passed to memcpy() inside shorten_decode_frame() of the Shorten (SHN) lossless audio decoder, where the implicit int-to-size_t conversion wraps the negative number to a value near SIZE_MAX, driving an over-read of the source allocation and a massive over-write past the decoder's bitstream buffer. Reaching the code path requires the ffconcat/concat demuxer, which is only permitted to reference arbitrary paths when the -safe 0 protection is disabled.

RemediationAI

Upstream fix available (PR/commit); released patched version not independently confirmed - apply the vendor patch from commit de771bd52774a52d45b0e2c82e56995a1ef40df7 (PR 23767 at https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23767) by upgrading to a build that incorporates it beyond 8.1.2, and consult the VulnCheck advisory (https://www.vulncheck.com/advisories/ffmpeg-out-of-bounds-write-via-ty-demuxer-and-shorten-decoder). Where immediate patching is not possible, avoid running FFmpeg with -safe 0 on untrusted concat/ffconcat inputs (the default -safe 1 blocks the path that references attacker-controlled files, at the cost of restricting legitimate absolute-path concat use cases). As a further control, disable or blacklist the TY demuxer and Shorten decoder for untrusted media (e.g. via -f/-c restrictions or a build that excludes them), accepting that TY and SHN files will no longer be processable, and sandbox any transcoding service that handles user-supplied files to contain heap corruption.

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Same weakness CWE-787 – Out-of-bounds Write

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CVE-2015-3113 CRITICAL POC
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CVE-2011-2462 CRITICAL POC
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CVE-2012-1889 HIGH POC
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CVE-2010-3333 HIGH POC
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CVE-2014-1761 HIGH POC
7.8
CVE-2009-3129 HIGH POC
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CVE-2021-1732 HIGH POC
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CVE-2013-3346 CRITICAL POC
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Same technique Buffer Overflow

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CVE-2017-7269 CRITICAL POC
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CVE-2015-5119 CRITICAL POC
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CVE-2015-3113 CRITICAL POC
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CVE-2011-2462 CRITICAL POC
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CVE-2020-0796 CRITICAL POC
10.0
CVE-2019-11043 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Not-Affected
SUSE Linux Enterprise Module for Package Hub 15 SP7 Not-Affected

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CVE-2026-65704 vulnerability details – vuln.today
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