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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTNIST
UNKNOWN
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mitreCNA
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Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
References
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/