CVE-2025-65548 Denial of service in n/a
Attackers can exhaust mint disk space by creating tokens with oversized preimages, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-65548?
CVE-2025-65548 is a critical denial of service vulnerability in n/a, published on 8 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
NUT-14 allows cashu tokens to be created with a preimage hash. However, nutshell (cashubtc/nuts) before 0.18.0 do not validate the size of preimage when the token is spent. The preimage is stored by the mint and attacker can exploit this vulnerability to fill the mint's db nd disk with arbitrary data.
Weakness: CWE-1284
Which versions are affected by CVE-2025-65548?
1 open source package ship an affected version, including cashu. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
cashu PyPI | All versions | 0.18.0 |
Products include Cashu Nutshell.
How do I fix CVE-2025-65548?
Upgrade cashu to 0.18.0 or later.
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-2025-65548 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-65548 exists.
Sources
Also known as GHSA-xwrw-2crp-46q4, PYSEC-2025-89.