{"action":"Upgrade cashu to 0.18.0 or later.","affected":[{"fixed":"0.18.0","introduced":"0"}],"component":"cashu","cve_ids":["CVE-2025-65548"],"ecosystem":"PyPI","epss":0.00416,"exploited":false,"fixed_versions":["0.18.0"],"id":"tcs_01M5KGPYFD5RFTSVK9SWSG6911","modified_at":"2026-05-20T09:18:54.109140Z","published_at":"2025-12-08T19:15:50.677Z","references":["https://osv.dev/vulnerability/PYSEC-2025-89","https://delvingbitcoin.org/t/public-disclosure-denial-of-service-using-htlc-in-cashu/2090","https://preimage007.github.io/","https://bitcointalk.org/index.php?topic=5564329","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"],"severity":{"label":"critical","score":9.1},"sources":[{"source":"osv","source_id":"PYSEC-2025-89","url":"https://osv.dev/vulnerability/PYSEC-2025-89"}],"summary":"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 t"}