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CVE-2025-65548

Good to know:

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Date: December 8, 2025

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.

Severity Score

Related Resources (8)

https://preimage007.github.io/
https://nvd.nist.gov/vuln/detail/CVE-2025-65548
https://github.com/cashubtc/nuts/blob/main/14.md
https://github.com/cashubtc/nuts/blob/main/07.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://delvingbitcoin.org/t/public-disclosure-denial-of-service-using-htlc-in-cashu/2090
https://bitcointalk.org/index.php?topic=5564329
https://www.mend.io/vulnerability-database/CVE-2025-65548

Severity Score

Weakness Type (CWE)

Improper Validation of Specified Quantity in Input

CWE-1284

Top Fix

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Upgrade Version

Upgrade to version https://github.com/cashubtc/nutshell.git - 0.18.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

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