CVE-2025-65548

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.

The following products are affected by CVE-2025-65548 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2025-65548.

URL	Resource
https://bitcointalk.org/index.php?topic=5564329
https://delvingbitcoin.org/t/public-disclosure-denial-of-service-using-htlc-in-cashu/2090
https://github.com/cashubtc/nuts/blob/main/07.md
https://github.com/cashubtc/nuts/blob/main/14.md
https://github.com/jamesob/delving-bitcoin-archive/blob/master/archive/rendered-topics/2025-11-November/2025-11-02-public-disclosure-denial-of-service-using-htlc-in-cashu-id2090.md
https://preimage007.github.io/