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CVE-2025-59733— Heap-buffer-overflow write in FFmpeg EXR dwa_uncompress

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.

OpenEXR是Academy Software Foundation开源的一种高动态范围图像（HDR）文件格式的开放标准。 OpenEXR存在安全漏洞，该漏洞源于DWAA或DWAB压缩解码时假设所有图像通道具有相同像素类型，可能导致缓冲区溢出。

AI Predicted 8.8 Difficulty: Easy EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-59733

Vulnerability Information
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Vulnerability Title
Heap-buffer-overflow write in FFmpeg EXR dwa_uncompress
Source: CVE Program / CVE List V5
Vulnerability Description
When decoding an OpenEXR file that uses DWAA or DWAB compression, there's an implicit assumption that all image channels have the same pixel type (and size), and that if there are four channels, the first four are "B", "G", "R" and "A". The channel parsing code can be found in decode_header. The buffer td->uncompressed_data is allocated in decode_block based on the xsize, ysize and computed current_channel_offset. The function dwa_uncompress then assumes at [5] that if there are 4 channels, these are "B", "G", "R" and "A", and in the calculations at [6] and [7] that all channels are of the same type, which matches the type of the main color channels. If we set the main color channels to a 4-byte type and add duplicate or unknown channels of the 2-byte EXR_HALF type, then the addition at [7] will increment the pointer by 4-bytes * xsize * nb_channels, which will exceed the allocated buffer. 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:N/PR:N/UI:P/VC:H/VI:H/VA:N/SC:H/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
OpenEXR 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenEXR是Academy Software Foundation开源的一种高动态范围图像（HDR）文件格式的开放标准。 OpenEXR存在安全漏洞，该漏洞源于DWAA或DWAB压缩解码时假设所有图像通道具有相同像素类型，可能导致缓冲区溢出。
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 9a32b863074ed4140141e0d3613905c6f1fe61c5 ~ 8.0 -

II. Public POCs for CVE-2025-59733

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III. Intelligence Information for CVE-2025-59733

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

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

IV. Related Vulnerabilities

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

V. Comments for CVE-2025-59733

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