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CVE-2026-64831— FFmpeg 8.0 - 8.1.2 Stack Buffer Overflow in Vulkan HEVC 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组织开源的一套可录制、转换以及流化音视频的完整解决方案。 FFmpeg 8.0版本至8.1.2版本存在缓冲区错误漏洞，该漏洞源于Vulkan HEVC硬件解码器存在栈缓冲区溢出，允许远程攻击者通过提供特制的HEVC/H.265位流，在vps_num_hrd_parameters值中嵌入恶意数据，以覆盖返回地址和相邻栈帧，可能导致任意代码执行。

CVSS 8.8 · High EPSS 0.85% · P57

Affected Version Matrix 2

VendorProduct Version RangeStatus
FFmpeg FFmpeg 8.0≤ 8.1.2 affected
92737390dc133daadce47dd7d2ec8ef3d9ebcbed affected
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I. Basic Information for CVE-2026-64831

Vulnerability Information
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Vulnerability Title
FFmpeg 8.0 - 8.1.2 Stack Buffer Overflow in Vulkan HEVC Decoder
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg versions 8.0 through 8.1.2 contains a stack buffer overflow vulnerability in the Vulkan HEVC hardware decoder that allows remote attackers to overwrite return addresses and adjacent stack frames by supplying a crafted HEVC/H.265 bitstream. Attackers can embed a malicious vps_num_hrd_parameters value exceeding HEVC_MAX_SUB_LAYERS in any supported container format to overflow stack-allocated arrays in the vk_hevc_end_frame function, potentially achieving arbitrary code execution.
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
栈缓冲区溢出
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 8.0版本至8.1.2版本存在缓冲区错误漏洞，该漏洞源于Vulkan HEVC硬件解码器存在栈缓冲区溢出，允许远程攻击者通过提供特制的HEVC/H.265位流，在vps_num_hrd_parameters值中嵌入恶意数据，以覆盖返回地址和相邻栈帧，可能导致任意代码执行。
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 8.0 ~ 8.1.2 -

II. Public POCs for CVE-2026-64831

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III. Intelligence Information for CVE-2026-64831

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Patches & Fixes for CVE-2026-64831 (2)

Vendor Advisories for CVE-2026-64831 (1)

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

CVE-2026-64830 8.8 HIGH FFmpeg 2.1 - 8.1.2 Heap Buffer Overflow via VobSub Subtitle Demuxer
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-121

V. Comments for CVE-2026-64831

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