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CVE-2026-70630— FFmpeg 3.0 < 9.0 Uninitialized Heap Memory Read in Screenpresso 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，该漏洞源于原生Screenpresso解码器中的未初始化堆内存读取问题，screenpresso_decode_frame()函数在调用av_image_copy_plane()前未验证产生的字节数，导致未写入的堆内存被复制到解码输出，攻击者可通过提供特制的SPV1数据包恢复敏感内存内容。

CVSS 5.5 · Medium EPSS 0.18% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg 3.0< 9.0 affected
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I. Basic Information for CVE-2026-70630

Vulnerability Information
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Vulnerability Title
FFmpeg 3.0 < 9.0 Uninitialized Heap Memory Read in Screenpresso 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 Screenpresso decoder (libavcodec/screenpresso.c) that allows attackers to recover sensitive memory contents by supplying a crafted SPV1 packet with a valid zlib stream that decompresses fewer bytes than the full frame requires. The screenpresso_decode_frame() function fails to validate the produced byte count before calling av_image_copy_plane() to copy the complete frame dimensions from the persistent ctx->inflated_buf buffer, causing unwritten heap memory from prior allocations or prior frames to be copied into decoded output and potentially exposing sensitive data such as userspace addresses from 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，该漏洞源于原生Screenpresso解码器中的未初始化堆内存读取问题，screenpresso_decode_frame()函数在调用av_image_copy_plane()前未验证产生的字节数，导致未写入的堆内存被复制到解码输出，攻击者可通过提供特制的SPV1数据包恢复敏感内存内容。
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-2026-70630

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III. Intelligence Information for CVE-2026-70630

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Patches & Fixes for CVE-2026-70630 (4)

Vendor Advisories for CVE-2026-70630 (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-2026-70629 5.5 MEDIUM FFmpeg 3.0 < 9.0 Uninitialized Heap Memory Read in RSCC 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-2026-70630

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