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CVE-2026-107676— FFmpeg through 9.0.2 Uninitialized Memory Disclosure via HDR10+ Metadata Serializer

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 在 9.0.2 及更早版本中，在函数 中存在一个未初始化内存披露漏洞。当 为 0 时，最多有三个 payload 字节未被初始化。攻击者可以通过提供精心构造的 Matroska T.35 BlockAdditional 或 HEVC/AV1 SEI 元数据，使得重新封装（remuxing）或转码（transcoding）过程将泄露的进程内存写入输出文件中。

CVSS 3.3 · Low

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg ≤ 9.0.2 affected
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I. Basic Information for CVE-2026-107676

Vulnerability Information
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Vulnerability Title
FFmpeg through 9.0.2 Uninitialized Memory Disclosure via HDR10+ Metadata Serializer
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg through 9.0.2 contains an uninitialized memory disclosure vulnerability in av_dynamic_hdr_plus_to_t35() that leaves up to three payload bytes uninitialized when tone_mapping_flag is 0. Attackers can supply crafted Matroska T.35 BlockAdditional or HEVC/AV1 SEI metadata so that remuxing or transcoding writes leaked process memory into output files.
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:N
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
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-2026-107676

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III. Intelligence Information for CVE-2026-107676

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Patches & Fixes for CVE-2026-107676 (3)

Vendor Advisories for CVE-2026-107676 (1)

Vendor Pages for CVE-2026-107676 (1)

Same Patch Batch · FFmpeg · 2026-10-08 · 9 CVEs total

CVE-2026-107695 6.5 MEDIUM FFmpeg before 8.1.3 HLS Demuxer Infinite Loop via Self-Referencing Playlist
CVE-2026-107696 6.5 MEDIUM FFmpeg through 9.0.2 Infinite Loop via RTSP Redirect Handling in rtsp.c
CVE-2026-107675 5.9 MEDIUM FFmpeg through 9.0.2 Missing SSH Host Key Verification in sftp Protocol
CVE-2026-107698 5.4 MEDIUM FFmpeg before 7.1.4 and 8.0.2 SSRF via RTSP Redirect Handling
CVE-2026-107660 4.8 MEDIUM FFmpeg before 8.1.3 and 9.x before 9.0.2 mbedTLS Hostname Verification Bypass for IP Hosts
CVE-2026-107677 4.7 MEDIUM FFmpeg through 9.0.2 DASH Demuxer Infinite Loop via Empty SegmentTemplate Media
CVE-2026-107678 4.7 MEDIUM FFmpeg through 9.0.2 Stack Exhaustion via Recursive Free of pssh Boxes
CVE-2026-107697 4.3 MEDIUM FFmpeg before 8.1.3 HLS Demuxer Security Check Bypass via parse_playlist()

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-908

V. Comments for CVE-2026-107676

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