Vulnerability · Published Oct 5, 2026 · Assigned by GitHub_M

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

Medium 5.3

In plain English

A medium-severity resource allocation without limits in penpot from penpot. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.3%top 73.8% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
penpot	penpot	< 2.18.0

Weakness: CWE-770 · Vector: 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

References

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