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CVE-2026-70628— FFmpeg 0.5 < 9.0 DVB Subtitle Parser Heap Buffer Overflow via WTV File

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之前版本存在安全漏洞，该漏洞源于libavcodec/dvbsub_parser.c中的DVB字幕解析器存在有符号整数溢出，攻击者可通过提供特制的WTV文件触发堆缓冲区溢出，导致边界检查保护表达式回绕至INT_MIN，绕过PARSE_BUF_SIZE比较并调用memcpy，造成越界堆写入，可能导致内存损坏或代码执行。

CVSS 7.8 · High EPSS 0.14% · P3

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg 0.5< 9.0 affected
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I. Basic Information for CVE-2026-70628

Vulnerability Information
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Vulnerability Title
FFmpeg 0.5 < 9.0 DVB Subtitle Parser Heap Buffer Overflow via WTV File
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg versions from 0.5 up to, but not including, 9.0 contain a signed integer overflow vulnerability in the DVB subtitle parser in libavcodec/dvbsub_parser.c that allows attackers to trigger a heap buffer overflow by supplying a crafted WTV file. The overflow causes the bounds-check guard expression to wrap to INT_MIN, bypassing the PARSE_BUF_SIZE comparison and invoking memcpy() with attacker-controlled data into a heap buffer, resulting in an out-of-bounds heap write and potential memory corruption or code execution.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
FFmpeg 数字错误漏洞
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之前版本存在安全漏洞，该漏洞源于libavcodec/dvbsub_parser.c中的DVB字幕解析器存在有符号整数溢出，攻击者可通过提供特制的WTV文件触发堆缓冲区溢出，导致边界检查保护表达式回绕至INT_MIN，绕过PARSE_BUF_SIZE比较并调用memcpy，造成越界堆写入，可能导致内存损坏或代码执行。
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-2026-70628

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III. Intelligence Information for CVE-2026-70628

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Patches & Fixes for CVE-2026-70628 (4)

Vendor Advisories for CVE-2026-70628 (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-2026-70630 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
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-190

V. Comments for CVE-2026-70628

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