CVE-2026-105686

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.

• CWE-770

• https://github.com/penpot/penpot/commit/06239844b10b123b7757969ab7618b201d3aba3b
• https://github.com/penpot/penpot/releases/tag/2.18.0
• https://github.com/penpot/penpot/security/advisories/GHSA-qvq5-c536-pmx8
• https://github.com/penpot/penpot/security/advisories/GHSA-qvq5-c536-pmx8

Published

Oct 5, 2026

Last Modified

Oct 6, 2026

Status

Deferred

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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