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.

CVSS v3 9.1 CRITICAL

9.1^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 3.9 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

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

Configurations

Configuration 1 (hide)

cpe:2.3:a:cashu:nutshell:*:*:*:*:*:*:*:*

History

18 Oct 2026, 14:10

Type	Values Removed	Values Added
Summary		(es) NUT-14 permite que los tokens cashu se creen con un hash de preimagen. Sin embargo, nutshell (cashubtc/nuts) antes de la versión 0.18.0 no valida el tamaño de la preimagen cuando se gasta el token. La preimagen es almacenada por el mint y el atacante puede explotar esta vulnerabilidad para llenar la base de datos y el disco del mint con datos arbitrarios.

Information

Published : 2025-12-08 19:15

Updated : 2026-10-18 14:10

NVD link : CVE-2025-65548

Mitre link : CVE-2025-65548

CVE.ORG link : CVE-2025-65548

JSON object : View

Products Affected

cashu

nutshell

CWE

CWE-1284

Improper Validation of Specified Quantity in Input

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