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CVE-2026-125256— FFmpeg through 9.0.2 Heap Buffer Overflow via RISC-V Vector diff_bytes Routine

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 9.0.2 及更早版本在 函数中存在一个堆缓冲区溢出漏洞。攻击者可通过在 Huffyuv 编码器中触发负长度值，从而破坏堆内存。在启用 RVV（RISC-V 向量扩展）的 RISC-V 构建中，若攻击者提供宽度小于 8 或 16 像素的 RGB 视频进行 Huffyuv 转码，将导致写入操作超出编码器的临时缓冲区范围。

CVSS 7.0 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg 7.0≤ 9.0.2 affected
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I. Basic Information for CVE-2026-125256

Vulnerability Information
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Vulnerability Title
FFmpeg through 9.0.2 Heap Buffer Overflow via RISC-V Vector diff_bytes Routine
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in ff_llvidenc_diff_bytes_rvv() that allows attackers to corrupt heap memory by triggering negative length values in the Huffyuv encoder. Attackers can supply RGB video narrower than 8 or 16 pixels for huffyuv transcoding on RVV-enabled RISC-V builds, causing writes past the encoder's temp buffer.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FFmpeg FFmpeg 7.0 ~ 9.0.2 -

II. Public POCs for CVE-2026-125256

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III. Intelligence Information for CVE-2026-125256

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Other References for CVE-2026-125256 (4)

Same Patch Batch · FFmpeg · 2026-11-09 · 121 CVEs total

CVE-2026-125233 7.8 HIGH FFmpeg through 9.0.2 Heap Buffer Overflow via DVB Subtitle Encoder
CVE-2026-125209 7.8 HIGH FFmpeg before 8.1.3 and 9.x before 9.0.2 Heap Buffer Overflow via dvdsubenc.c
CVE-2026-125250 7.8 HIGH FFmpeg through 9.0.2 GIF Encoder Heap Buffer Overflow via shrunk_buf Remap
CVE-2026-125267 7.8 HIGH FFmpeg before 8.1.3 and 9.x before 9.0.2 Heap Out-of-Bounds Write via APAC Decoder
CVE-2026-125262 7.8 HIGH FFmpeg through 9.0.2 Heap Buffer Overflow via LCEVC Enhancement Decoding
CVE-2026-125203 7.8 HIGH FFmpeg before 8.1.3 and 9.x before 9.0.2 Heap Buffer Overflow in Cook Multichannel Decoder
CVE-2026-125259 7.8 HIGH FFmpeg through 9.0.2 Heap Buffer Overflow via ProRes prores_ks Encoder
CVE-2026-125229 7.8 HIGH FFmpeg through 9.0.2 Out-of-Bounds Memory Access in Huffyuv/FFVHUFF Median Predictor
CVE-2026-125244 7.8 HIGH FFmpeg before 8.1.3 and 9.x before 9.0.2 VVC Decoder Out-of-Bounds Write via sh_entry_poin
CVE-2026-125260 7.0 HIGH FFmpeg through 9.0.2 Heap Buffer Overflow in EXR Encoder RLE Path
CVE-2026-125222 7.0 HIGH FFmpeg through 9.0.2 Heap Buffer Overflow via hap_parse_frame_header()
CVE-2026-125218 7.0 HIGH FFmpeg through 9.0.2 APNG Encoder Heap Buffer Overflow via encode_apng()
CVE-2026-125219 7.0 HIGH FFmpeg through 9.0.2 Heap Buffer Overflow via HEVC VDPAU Tile Arrays
CVE-2026-125257 7.0 HIGH FFmpeg through 9.0.2 Heap Overflow via Nellymoser Encoder Trellis Search
CVE-2026-125248 7.0 HIGH FFmpeg 9.0 through 9.0.2 Integer Overflow via FFV1 Vulkan Encoder Remap Buffer
CVE-2026-125213 7.0 HIGH FFmpeg through 9.0.2 Heap Buffer Overflow via PSD Decoder RLE Path
CVE-2026-125212 7.0 HIGH FFmpeg through 9.0.2 Heap Buffer Overflow via VideoToolbox Encoder
CVE-2026-125202 7.0 HIGH FFmpeg through 9.0.2 Heap Buffer Overflow via HEVC VAAPI Tile Arrays
CVE-2026-125241 7.0 HIGH FFmpeg through 9.0.2 Heap Buffer Overflow via FLIC Decoder check_pixel_ptr
CVE-2026-125235 7.0 HIGH FFmpeg through 9.0.2 Heap Overflow via QSV Encoder submit_frame()

Showing top 20 of 121 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-787