CVE-2025-65548
- State
- Published
- Severity
- 9.1 Critical
- Published
- Dec 8, 2025
- Updated
- Dec 11, 2025
- Reserved
- Nov 18, 2025
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | CISA-ADP |
Weaknesses
- CWE-1284 Improper Validation of Specified Quantity in Input
Affected Products
| Product | Versions |
|---|---|
n/an/a |
|
References
- https://delvingbitcoin.org/t/public-disclosure-denial-of-service-using-htlc-in-cashu/2090
- https://github.com/cashubtc/nuts/blob/main/14.md
- https://github.com/cashubtc/nuts/blob/main/07.md
- https://preimage007.github.io/
- 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://bitcointalk.org/index.php?topic=5564329
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