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CVE-2026-125261— FFmpeg through 9.0.2 SGI Encoder Out-of-Bounds Read via sgienc.c

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 及之前版本在 SGI 编码器的 函数（位于 ）中存在一个越界读取漏洞。该问题源于无符号大小变量未能正确处理负的 linesize（行间距）帧。攻击者可构造一个视频，其显示矩阵触发自动旋转垂直翻转（autorotate vflip）功能，导致在将视频转码为 SGI 图像时，系统读取帧范围之外的像素数据，进而引发进程崩溃。

CVSS 6.1 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg ≤ 9.0.2 affected
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I. Basic Information for CVE-2026-125261

Vulnerability Information
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Vulnerability Title
FFmpeg through 9.0.2 SGI Encoder Out-of-Bounds Read via sgienc.c
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg through 9.0.2 contains an out-of-bounds read vulnerability in the SGI encoder's encode_frame() in libavcodec/sgienc.c, where unsigned size variables mis-handle negative linesize frames. Attackers can supply a video whose display matrix triggers autorotate vflip, so transcoding to SGI images reads pixel data far outside the frame and crashes the process.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
FFmpeg FFmpeg 0 ~ 9.0.2 -

II. Public POCs for CVE-2026-125261

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III. Intelligence Information for CVE-2026-125261

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Other References for CVE-2026-125261 (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-125