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CVE-2025-59729— Heap-buffer-overflow read in FFmpeg DHAV get_duration

Quick assessment

Affected
FFmpeg FFmpeg
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ffmpeg是meh.个人开发者的一个rust库。 FFmpeg 8.0之前版本存在安全漏洞，该漏洞源于解析DHAV文件头时整数下溢，可能导致读取分配缓冲区前的持续时间。

AI Predicted 9.1 Difficulty: Easy EPSS 0.16% · P5
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I. Basic Information for CVE-2025-59729

Vulnerability Information
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Vulnerability Title
Heap-buffer-overflow read in FFmpeg DHAV get_duration
Source: CVE Program / CVE List V5
Vulnerability Description
When parsing the header for a DHAV file, there's an integer underflow in offset calculation that leads to reading the duration from before the start of the allocated buffer. If we load a DHAV file that is larger than MAX_DURATION_BUFFER_SIZE bytes (0x100000) for example 0x101000 bytes, then at [0] we have size = 0x101000. At [1] we have end_buffer_size = 0x100000, and at [2] we have end_buffer_pos = 0x1000. The loop then scans backwards through the buffer looking for the dhav tag; when it is found, we'll calculate end_pos based on a 32-bit offset read from the buffer. There is subsequently a check [3] that end_pos is within the section of the file that has been copied into end_buffer, but it only correctly handles the cases where end_pos is before the start of the file or after the section copied into end_buffer, and not the case where end_pos is within the the file, but before the section copied into end_buffer. If we provide such an offset, (end_pos - end_buffer_pos) can underflow, resulting in the subsequent access at [4] occurring before the beginning of the allocation. We recommend upgrading to version 8.0 or beyond.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:H/AT:P/PR:L/UI:P/VC:L/VI:H/VA:N/SC:L/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
FFmpeg 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ffmpeg是meh.个人开发者的一个rust库。 FFmpeg 8.0之前版本存在安全漏洞，该漏洞源于解析DHAV文件头时整数下溢，可能导致读取分配缓冲区前的持续时间。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
FFmpeg FFmpeg a218cafe4d3be005ab0c61130f90db4d21afb5db ~ 8.0 -

II. Public POCs for CVE-2025-59729

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III. Intelligence Information for CVE-2025-59729

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Patches & Fixes for CVE-2025-59729 (1)

Same Patch Batch · FFmpeg · 2025-10-06 · 7 CVEs total

CVE-2025-59733 Heap-buffer-overflow write in FFmpeg EXR dwa_uncompress
CVE-2025-59734 Heap-buffer-overflow write in FFmpeg SANM process_ftch
CVE-2025-59728 Heap-buffer-overflow write in FFmpeg MDASH resolve_content_path
CVE-2025-59731 Heap-buffer-overflow write in FFmpeg EXR dwa_uncompress
CVE-2025-59730 Heap-buffer-overflow write in FFmpeg SANM decoding due to lack of bounds-checking in old_c
CVE-2025-59732 Heap-buffer-overflow write in FFmpeg EXR dwa_uncompress

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-787

V. Comments for CVE-2025-59729

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