CVE-2026-61617 Pterodactyl Wings SFTP write path does not enforce disk quota, allowing node-wide disk exhaustion
Attackers with SFTP access can exhaust host disk space by bypassing quota checks, causing denial of service for all servers on the node.
- 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-2026-61617?
CVE-2026-61617 is a high-severity denial of service vulnerability in pterodactyl wings, published on 26 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Wings is the server control plane for the Pterodactyl game-server management panel. In versions up to and including 1.13.2, the SFTP write path does not enforce a server's disk quota during a transfer, allowing a tenant with SFTP write access to a single server to exhaust the host node's physical disk and take down every server on it. Wings checks available space only once, as a boolean, when the write handle is opened, using a stale cached usage value and without knowing the size of the incoming data, and it then returns a raw, unaccounted file handle that is never re-checked as the transfer proceeds. A single upload can therefore be written without bound, far beyond the configured disk limit, until the node's disk is full, and because a server stopped for exceeding its limit is not treated as suspended, SFTP writes are still accepted even after the quota is already exceeded. This issue is fixed in version 1.13.3.
Which versions are affected by CVE-2026-61617?
How do I fix CVE-2026-61617?
No fix has been published for CVE-2026-61617 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-2026-61617 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-61617 exists.
Sources
Also known as GHSA-8j54-xcwx-597p.