FFmpeg up to 9.0.2 HAP Decoder libavcodec/hapdec.c hap_parse_frame_header integer overflow

Summaryinfo

A vulnerability was found in FFmpeg up to 9.0.2. It has been rated as critical. Affected by this issue is the function hap_parse_frame_header of the file libavcodec/hapdec.c of the component HAP Decoder. Performing a manipulation results in integer overflow. This vulnerability is known as CVE-2026-125222. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, was found in FFmpeg up to 9.0.2. This affects the function hap_parse_frame_header of the file libavcodec/hapdec.c of the component HAP Decoder. The manipulation 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 occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

FFmpeg through 9.0.2 contains an integer overflow vulnerability in hap_parse_frame_header() in libavcodec/hapdec.c that allows attackers to trigger a heap buffer overflow on 32-bit builds. Attackers can craft Hap video frames with Snappy length prefixes that wrap tex_size, causing decompress_chunks_thread() to write outside tex_buf and crash the application or potentially execute code.

It is possible to read the advisory at code.ffmpeg.org. This vulnerability is uniquely identified as CVE-2026-125222 since 11/09/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/09/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Multimedia Processing Software

Name

• FFmpeg

Version

• 9.0.0
• 9.0.1
• 9.0.2

License

• open-source

Website

• Product: https://ffmpeg.org/

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