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FFmpeg CVE-2026-66039

| EUVDEUVD-2026-48741 HIGH
Integer Overflow or Wraparound (CWE-190)
2026-07-24 VulnCheck
8.7
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/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
8.8 HIGH

User interaction required, so UI:R; no privileges needed; exploit leads to complete compromise of process.

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

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

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

Lifecycle Timeline

2
Analysis Generated
Jul 26, 2026 - 11:40 vuln.today
CVE Published
Jul 24, 2026 - 19:42 cve.org
HIGH 8.7

DescriptionCVE.org

FFmpeg through 8.1.2, fixed in commit aafb5c6, contains a signed integer overflow vulnerability in the MACE6 audio decoder that allows attackers to corrupt heap memory by supplying a crafted CAF file with a malicious bytes_per_packet value. Attackers can craft a CAF file with oversized bytes_per_packet and frames_per_packet values in the desc chunk to trigger an integer overflow in mace_decode_frame() during output sample count computation, resulting in an undersized buffer allocation and heap out-of-bounds write that could enable code execution.

AnalysisAI

Heap-based buffer overflow in FFmpeg versions up to 8.1.2 via a crafted CAF file can allow remote code execution. Exploitation requires user interaction (opening a malicious file). No known active exploitation or public exploit exists, but the vulnerability carries a critical severity score (CVSS 8.8).

Technical ContextAI

The vulnerability lies in FFmpeg's MACE6 audio decoder when parsing CAF (Core Audio Format) files. A signed integer overflow (CWE-190) occurs in the mace_decode_frame() function because the decoder computes output sample counts using attacker-controlled bytes_per_packet and frames_per_packet values from the CAF desc chunk. The resulting undersized heap buffer allocation leads to a heap out-of-bounds write. FFmpeg is widely embedded in media applications as indicated by its CPE string (cpe:2.3:a:ffmpeg:ffmpeg:*:*:*:*:*:*:*:*) covering all vulnerable versions.

RemediationAI

Upgrade to an FFmpeg build that includes commit aafb5c655edc76a753275c383ebb139feb032718, or apply that patch directly. No official workaround is documented; temporarily disabling the MACE6 decoder or blocking CAF files with oversized desc chunk values could mitigate risk in high-security environments but may disrupt functionality. The patch can be obtained from https://code.ffmpeg.org/FFmpeg/FFmpeg/commit/aafb5c655edc76a753275c383ebb139feb032718.

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
openSUSE Leap 16.0 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Affected

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CVE-2026-66039 vulnerability details – vuln.today

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