CRITICAL9.1
PYSEC-2025-89
Quick fix
PYSEC-2025-89 — cashu: upgrade to the fixed version with the command below.
pip install --upgrade 'cashu>=0.18.0'Details
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.
Are you affected?
Enter the version of the package you're using.
Affected packages
References
- https://delvingbitcoin.org/t/public-disclosure-denial-of-service-using-htlc-in-cashu/2090[WEB]
- https://preimage007.github.io/[WEB]
- https://bitcointalk.org/index.php?topic=5564329[REPORT]
- https://github.com/cashubtc/nuts/blob/main/07.md[EVIDENCE]
- https://github.com/cashubtc/nuts/blob/main/14.md[EVIDENCE]
- 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[EVIDENCE]