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CVE-2026-107678— FFmpeg through 9.0.2 Stack Exhaustion via Recursive Free of pssh Boxes

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 版本及之前，在 文件中的 函数存在栈耗尽漏洞。该函数会递归释放由 MOV 解复用器的 函数构建的 AVEncryptionInitInfo 链表。攻击者可以提供包含数万个小 pssh box（盒子）的精心构造的 MP4 文件，从而导致栈空间耗尽并使进程崩溃，同时还会引发二次方的 CPU 消耗问题。

CVSS 4.7 · Medium

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
FFmpeg FFmpeg ≤ 9.0.2 affected
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I. Basic Information for CVE-2026-107678

Vulnerability Information
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Vulnerability Title
FFmpeg through 9.0.2 Stack Exhaustion via Recursive Free of pssh Boxes
Source: CVE Program / CVE List V5
Vulnerability Description
FFmpeg through 9.0.2 contains a stack exhaustion vulnerability in av_encryption_init_info_free() in libavutil/encryption_info.c, which recursively frees AVEncryptionInitInfo linked lists built by the MOV demuxer's mov_read_pssh(). Attackers can supply a crafted MP4 file with tens of thousands of small pssh boxes to exhaust the stack and crash the process, while also causing quadratic CPU consumption.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
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-2026-107678

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III. Intelligence Information for CVE-2026-107678

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Patches & Fixes for CVE-2026-107678 (2)

Vendor Advisories for CVE-2026-107678 (1)

Vendor Pages for CVE-2026-107678 (1)

Other References for CVE-2026-107678 (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-2026-107697 4.3 MEDIUM FFmpeg before 8.1.3 HLS Demuxer Security Check Bypass via parse_playlist()
CVE-2026-107676 3.3 LOW FFmpeg through 9.0.2 Uninitialized Memory Disclosure via HDR10+ Metadata Serializer

IV. Related Vulnerabilities

Same product: FFmpeg
Same vendor: FFmpeg
Same weakness: CWE-674

V. Comments for CVE-2026-107678

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