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nuts

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.

CVE-2025-65548 identifies a critical vulnerability in nutshell (cashubtc/nuts) versions prior to 0.18.0 related to improper validation of preimage sizes when spending cashu tokens. Cashu tokens utilize a cryptographic preimage hash mechanism, where the preimage is revealed upon token spending to prove ownership. However, nutshell fails to enforce size constraints on these preimages, allowing an attacker to craft tokens with excessively large preimages. When such tokens are spent, the mint stores the preimage data in its database and disk storage without limitation. This flaw can be exploited remotely without authentication or user interaction, as the CVSS vector indicates network attack vector, low attack complexity, and no privileges required. The primary impact is a denial-of-service condition through resource exhaustion, potentially filling the mint’s database and disk space, leading to service degradation or outages. The vulnerability is categorized under CWE-1284, which relates to improper validation of input sizes. Although no public exploits have been reported yet, the high CVSS score (9.1) reflects the critical nature of this flaw. The absence of patch links suggests that a fix is either pending or must be obtained from the vendor’s latest releases. Organizations relying on nutshell for managing cashu tokens must be aware of this risk and act promptly to prevent exploitation.

Detailed information about CVE-2025-65548: n/a. Get real-time updates, technical details, and mitigation strategies.

CVE-2025-65548: n/a - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2025-65548: n/a

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