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CVE-2026-70629— FFmpeg 3.0 < 9.0 Uninitialized Heap Memory Read in RSCC Decoder

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FFmpeg组织开源的一个多媒体处理框架。 FFmpeg 3.0版本至9.0之前版本存在资源管理错误漏洞，该漏洞源于RSCC解码器（libavcodec/rscc.c）未验证解压字节数与图块尺寸，导致未初始化堆内存读取，攻击者可通过提供特制视频文件泄露堆内存内容。

CVSS 5.5 · Medium EPSS 0.18% · P6

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg 3.0< 9.0 affected
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I. Basic Information for CVE-2026-70629

Vulnerability Information
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Vulnerability Title
FFmpeg 3.0 < 9.0 Uninitialized Heap Memory Read in RSCC Decoder
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg versions from 3.0 up to, but not including, 9.0 contain an uninitialized heap memory read vulnerability in the native RSCC decoder (libavcodec/rscc.c) that allows attackers to disclose heap memory contents by supplying a crafted video file with a compressed tile that decompresses fewer bytes than the declared tile geometry requires. When rscc_decode_frame() calls av_image_copy_plane() without validating the decompressed byte count against the tile dimensions, the unwritten suffix of the persistent intermediate buffer ctx->inflated_buf is copied into the decoded frame, potentially exposing data from prior heap allocations or previous decoded frames in persistent decoding services.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
Source: CVE Program / CVE List V5
Vulnerability Title
FFmpeg 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FFmpeg是FFmpeg组织开源的一个多媒体处理框架。 FFmpeg 3.0版本至9.0之前版本存在资源管理错误漏洞，该漏洞源于RSCC解码器（libavcodec/rscc.c）未验证解压字节数与图块尺寸，导致未初始化堆内存读取，攻击者可通过提供特制视频文件泄露堆内存内容。
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 3.0 ~ 9.0 -

II. Public POCs for CVE-2026-70629

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III. Intelligence Information for CVE-2026-70629

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Patches & Fixes for CVE-2026-70629 (4)

Vendor Advisories for CVE-2026-70629 (1)

Same Patch Batch · FFmpeg · 2026-08-06 · 5 CVEs total

CVE-2026-70632 7.8 HIGH FFmpeg 4.4 < 9.0 Heap Out-of-Bounds Write in CFHD Decoder via AVI Demuxing
CVE-2026-70628 7.8 HIGH FFmpeg 0.5 < 9.0 DVB Subtitle Parser Heap Buffer Overflow via WTV File
CVE-2026-70630 5.5 MEDIUM FFmpeg 3.0 < 9.0 Uninitialized Heap Memory Read in Screenpresso Decoder
CVE-2026-70631 5.5 MEDIUM FFmpeg 0.5 < 9.0 Uninitialized Heap Memory Read in TIFF Decoder

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-908

V. Comments for CVE-2026-70629

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