CVE-2026-105686 Penpot: Repeated chunk index causes temporary-storage amplification
An authenticated user can cause resource exhaustion by repeatedly uploading chunks with the same index, leading to temporary storage amplification.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-105686?
CVE-2026-105686 is a medium-severity denial of service vulnerability in penpot, published on 5 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
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.
Weakness: CWE-770
Which versions are affected by CVE-2026-105686?
How do I fix CVE-2026-105686?
No fix has been published for CVE-2026-105686 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-105686 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105686 exists.
Sources
Also known as GHSA-qvq5-c536-pmx8.