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.

• CWE-1284

• https://bitcointalk.org/index.php?topic=5564329Exploit, Issue Tracking
• https://delvingbitcoin.org/t/public-disclosure-denial-of-service-using-htlc-in-cashu/2090Broken Link
• https://github.com/cashubtc/nuts/blob/main/07.mdExploit, Third Party Advisory
• https://github.com/cashubtc/nuts/blob/main/14.mdExploit, Third Party Advisory
• 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.mdExploit, Third Party Advisory
• https://preimage007.github.io/Product
• https://bitcointalk.org/index.php?topic=5564329Exploit, Issue Tracking
• 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.mdExploit, Third Party Advisory

Published

Dec 8, 2025

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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