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CVE-2026-105686— Penpot: Repeated chunk index causes temporary-storage amplification

Quick assessment

Affected
penpot penpot
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.

Penpot 是一个开源的设计与原型制作平台。在版本 2.18.0 之前，分块媒体上传的 RPC 接口会验证分块索引是否在有效范围内，但不会拒绝已存储过的索引，也不会替换该索引对应的旧对象。经过身份验证的用户可以反复上传具有相同有效索引的分块，导致每次成功的请求都会分配一个新的临时对象，从而使存储的数据量超出上传会话声明的逻辑大小。只有在分配完成后，系统检测机制才会发现分块数量不一致。此问题已在版本 2.18.0 中得到修复。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2026-105686

Vulnerability Information
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Vulnerability Title
Penpot: Repeated chunk index causes temporary-storage amplification
Source: CVE Program / CVE List V5
Vulnerability Description
Penpot is an open-source design and prototyping platform. Prior to 2.18.0, the chunked media upload RPC validates that a chunk index is in range but neither rejects an already stored index nor replaces its previous object. An authenticated user can repeatedly upload the same valid index, causing each successful request to allocate another temporary object and increasing stored bytes beyond the upload session's declared logical size. Assembly detects the inconsistent chunk count only after allocation. This issue is fixed in version 2.18.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
penpot penpot < 2.18.0 -

II. Public POCs for CVE-2026-105686

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III. Intelligence Information for CVE-2026-105686

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Other References for CVE-2026-105686 (3)

Same Patch Batch · penpot · 2026-10-05 · 12 CVEs total

CVE-2026-105691 9.9 CRITICAL Penpot: Authenticated OS Command Injection in Penpot SVG Exporter via Legacy fill-color
CVE-2026-105688 6.7 MEDIUM Penpot: Team admin can escalate to owner via team invitation (missing owner-role guard on
CVE-2026-105696 6.5 MEDIUM Penpot: Share-link page-scope escalation: a share-link holder reads pages outside the link
CVE-2026-105689 6.0 MEDIUM Penpot: SSRF guard bypass via IPv6 transition addresses (NAT64/6to4/Teredo) in webhook del
CVE-2026-105695 5.9 MEDIUM Penpot: Missing authorization in chunked-upload assembly lets another authenticated user c
CVE-2026-105690 5.9 MEDIUM Penpot: Server-side session not invalidated on logout; stale auth-token cookie remains val
CVE-2026-105694 5.4 MEDIUM Penpot: Stored XSS via Unsanitised SVG Uploads
CVE-2026-105692 5.4 MEDIUM Penpot: IDOR in Share-Link Deletion Allows Any File Editor to Delete Share-Links They Did
CVE-2026-105693 5.3 MEDIUM Penpot: Anonymous share-link token disclosure & page-scope bypass via get-view-only-bundle
CVE-2026-105687 4.9 MEDIUM Penpot: A team admin (non-owner) can remove the team owner via ::delete-team-member — miss
CVE-2026-105684 4.3 MEDIUM Penpot: Share-link page-scope escape — comment RPCs leak comment content, author identity,

IV. Related Vulnerabilities

Same product: penpot
Same vendor: penpot
Same weakness: CWE-770

V. Comments for CVE-2026-105686

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