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CVE-2026-125233— FFmpeg through 9.0.2 Heap Buffer Overflow via DVB Subtitle Encoder

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 及更早版本在文件中的函数存在堆缓冲区溢出漏洞。该漏洞源于对每个 CLUT 段头部少计算了 2 个字节。攻击者可构造包含大量位图字幕矩形的文件，当该文件被转码至 dvbsub 编码器时，会导致数据写入超出输出缓冲区，从而破坏堆内存。

CVSS 7.8 · High Updated Nov 10, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
FFmpeg	FFmpeg	`≤ 9.0.2`	affected

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Vulnerability Information

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Vulnerability Title

FFmpeg through 9.0.2 Heap Buffer Overflow via DVB Subtitle Encoder

Source: CVE Program / CVE List V5

Vulnerability Description

FFmpeg through 9.0.2 contains a heap buffer overflow vulnerability in dvbsub_encode() in libavcodec/dvbsubenc.c that undercounts each CLUT segment header by two bytes. Attackers can supply a file with many bitmap subtitle rectangles that, when transcoded to the dvbsub encoder, writes past the output buffer and corrupts heap memory.

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

缓冲区大小计算不正确

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-2026-125233

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-125233

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Other References for CVE-2026-125233 (4)

https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/24913 issue-tracking
https://github.com/FFmpeg/FFmpeg/blob/n9.0.2/libavcodec/dvbsubenc.c#L363 technical-description
https://github.com/FFmpeg/FFmpeg/commit/7f80b2ad83f37a4998d9617495c92b28a7339a90 patch
https://www.vulncheck.com/advisories/ffmpeg-through-9.0.2-heap-buffer-overflow-via-dvb-subtitle-encoder third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-125233

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

CVE-2026-125259	7.8 HIGH	FFmpeg through 9.0.2 Heap Buffer Overflow via ProRes prores_ks Encoder
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-2026-125244	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-2026-125229	7.8 HIGH	FFmpeg through 9.0.2 Out-of-Bounds Memory Access in Huffyuv/FFVHUFF Median Predictor
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-2026-125209	7.8 HIGH	FFmpeg before 8.1.3 and 9.x before 9.0.2 Heap Buffer Overflow via dvdsubenc.c
CVE-2026-125214	7.0 HIGH	FFmpeg through 9.0.2 Heap Buffer Overflow in Blu-ray PCM Decoder
CVE-2026-125251	7.0 HIGH	FFmpeg through 9.0.2 VVC Decoder Heap Out-of-Bounds Write via refs.c
CVE-2026-125181	7.0 HIGH	FFmpeg through 9.0.2 FLIC Decoder Out-of-Bounds Write via FLI_BRUN Byte Swap
CVE-2026-125239	7.0 HIGH	FFmpeg through 9.0.2 Heap Buffer Overflow via HEVC DXVA Tile Parameters
CVE-2026-125201	7.0 HIGH	FFmpeg 7.0 before 8.1.3 and 9.x before 9.0.2 Heap Overflow via vulkan_av1.c
CVE-2026-125196	7.0 HIGH	FFmpeg through 9.0.2 Heap Buffer Overflow via liboapv APV Encoder Wrapper
CVE-2026-125212	7.0 HIGH	FFmpeg through 9.0.2 Heap Buffer Overflow via VideoToolbox Encoder
CVE-2026-125218	7.0 HIGH	FFmpeg through 9.0.2 APNG Encoder Heap Buffer Overflow via encode_apng()
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-2026-125260	7.0 HIGH	FFmpeg through 9.0.2 Heap Buffer Overflow in EXR Encoder RLE Path

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

IV. Related Vulnerabilities

Same product: FFmpeg

Same vendor: FFmpeg

Same weakness: CWE-131