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CVE-2026-70631— FFmpeg 0.5 < 9.0 Uninitialized Heap Memory Read in TIFF 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 0.5版本至9.0之前版本存在资源管理错误漏洞，该漏洞源于libavcodec/tiff.c中的原生TIFF解码器存在未初始化堆内存泄露，可能导致解码特制TIFF文件时泄露敏感数据。

CVSS 5.5 · Medium EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg 0.5< 9.0 affected
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I. Basic Information for CVE-2026-70631

Vulnerability Information
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Vulnerability Title
FFmpeg 0.5 < 9.0 Uninitialized Heap Memory Read in TIFF Decoder
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg versions from 0.5 up to, but not including, 9.0 contain an uninitialized heap memory disclosure vulnerability in the native TIFF decoder in libavcodec/tiff.c. An attacker who can cause FFmpeg to decode a crafted TIFF file can supply a valid Deflate-compressed strip that terminates successfully after producing fewer bytes than the declared strip requires. The tiff_unpack_zlib() function allocates a heap buffer sized for the full declared strip but copies all declared rows via memcpy() regardless of how many bytes zlib actually decompressed, causing unwritten bytes that can contain stale data from prior heap allocations to be incorporated into decoded image output and potentially exposing sensitive data in persistent 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 0.5版本至9.0之前版本存在资源管理错误漏洞，该漏洞源于libavcodec/tiff.c中的原生TIFF解码器存在未初始化堆内存泄露，可能导致解码特制TIFF文件时泄露敏感数据。
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 0.5 ~ 9.0 -

II. Public POCs for CVE-2026-70631

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III. Intelligence Information for CVE-2026-70631

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Patches & Fixes for CVE-2026-70631 (4)

Vendor Advisories for CVE-2026-70631 (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-2026-70629 5.5 MEDIUM FFmpeg 3.0 < 9.0 Uninitialized Heap Memory Read in RSCC Decoder

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-70631

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