What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.3 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-05 · updated 2026-10-06
• Weakness: CWE-770

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.

Affected products

• penpot: before 2.18.0

References

• 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

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