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CVE-2026-64830— FFmpeg 2.1 - 8.1.2 Heap Buffer Overflow via VobSub Subtitle Demuxer

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组织开源的一套可录制、转换以及流化音视频的完整解决方案。 FFmpeg 2.1版本至8.1.2版本存在缓冲区错误漏洞，该漏洞源于VobSub字幕解复用器存在堆缓冲区溢出问题，允许攻击者通过提供恶意.sub/.idx字幕文件，声明超过libavformat/mpeg.c中固定大小数组边界的流ID，从而导致破坏相邻堆内存。

CVSS 8.8 · High EPSS 0.65% · P49

Affected Version Matrix 2

VendorProduct Version RangeStatus
FFmpeg FFmpeg 2.1≤ 8.1.2 affected
dbd495f066a85ba96b17433f4306582aa37c3951 affected
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I. Basic Information for CVE-2026-64830

Vulnerability Information
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Vulnerability Title
FFmpeg 2.1 - 8.1.2 Heap Buffer Overflow via VobSub Subtitle Demuxer
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg versions 2.1 through 8.1.2 contains a heap buffer overflow vulnerability in the VobSub subtitle demuxer that allows attackers to corrupt adjacent heap memory by supplying a malicious .sub/.idx subtitle file declaring more distinct stream IDs than the fixed-size array bounds in libavformat/mpeg.c. Attackers can craft a subtitle file with excessive distinct stream IDs to trigger unbounded writes beyond the vobsub->q[] array boundary via ff_subtitles_queue_insert(), potentially achieving arbitrary code execution in any application using FFmpeg's VobSub demuxer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
FFmpeg 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FFmpeg是FFmpeg组织开源的一套可录制、转换以及流化音视频的完整解决方案。 FFmpeg 2.1版本至8.1.2版本存在缓冲区错误漏洞，该漏洞源于VobSub字幕解复用器存在堆缓冲区溢出问题，允许攻击者通过提供恶意.sub/.idx字幕文件，声明超过libavformat/mpeg.c中固定大小数组边界的流ID，从而导致破坏相邻堆内存。
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 2.1 ~ 8.1.2 -

II. Public POCs for CVE-2026-64830

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III. Intelligence Information for CVE-2026-64830

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Patches & Fixes for CVE-2026-64830 (2)

Vendor Advisories for CVE-2026-64830 (1)

Same Patch Batch · FFmpeg · 2026-07-22 · 6 CVEs total

CVE-2026-64831 8.8 HIGH FFmpeg 8.0 - 8.1.2 Stack Buffer Overflow in Vulkan HEVC Decoder
CVE-2026-64832 8.8 HIGH FFmpeg 4.4 - 8.1.2 Double-Free in NVDEC Hardware Decoder via nvdec.c
CVE-2026-64835 8.8 HIGH FFmpeg 4.4 - 8.1.2 Out-of-Bounds Memory Access in ADX Audio Decoder
CVE-2026-64834 7.5 HIGH FFmpeg 0.6.3 - 8.1.2 Infinite Loop DoS via RTP/ASF Demuxer
CVE-2026-64833 7.1 HIGH FFmpeg 0.7.1 - 8.1.2 Out-of-Bounds Read via S/PDIF Muxer spdifenc.c

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-122

V. Comments for CVE-2026-64830

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