FFmpeg up to 8.1.2 MACE6 Audio Decoder mace_decode_frame bytes_per_packet integer overflow

Summaryinfo

A vulnerability was found in FFmpeg up to 8.1.2. It has been rated as critical. Affected is the function mace_decode_frame of the component MACE6 Audio Decoder. Performing a manipulation of the argument bytes_per_packet results in integer overflow. This vulnerability is cataloged as CVE-2026-66039. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in FFmpeg up to 8.1.2. It has been classified as critical. This affects the function mace_decode_frame of the component MACE6 Audio Decoder. The manipulation of the argument bytes_per_packet with an unknown input leads to a integer overflow vulnerability. CWE is classifying the issue as CWE-190. The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at code.ffmpeg.org. This vulnerability is uniquely identified as CVE-2026-66039 since 07/23/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Applying the patch aafb5c655edc76a753275c383ebb139feb032718 is able to eliminate this problem.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Multimedia Processing Software

Name

• FFmpeg

Version

• 8.1.0
• 8.1.1
• 8.1.2

License

• open-source

Website

• Product: https://ffmpeg.org/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion