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Description

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.

PUBLISHED Reserved 2025-11-18 | Published 2025-12-08 | Updated 2025-12-11 | Assigner mitre

References

github.com/...enial-of-service-using-htlc-in-cashu-id2090.md exploit

bitcointalk.org/index.php?topic=5564329 exploit

delvingbitcoin.org/...al-of-service-using-htlc-in-cashu/2090

github.com/cashubtc/nuts/blob/main/14.md

github.com/cashubtc/nuts/blob/main/07.md

preimage007.github.io/

github.com/...enial-of-service-using-htlc-in-cashu-id2090.md

bitcointalk.org/index.php?topic=5564329

cve.org (CVE-2025-65548)

nvd.nist.gov (CVE-2025-65548)

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