CVE-2025-65548

CVSS 9.1 CRITICALEPSS 0.4%CWE-1284

Vexday Risk Score

28Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 9.1EPSS 0.4%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

08 Dec 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

n/a · n/a

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References

https://bitcointalk.org/index.php?topic=5564329 https://delvingbitcoin.org/t/public-disclosure-denial-of-service-using-htlc-in-cashu/2090 https://github.com/cashubtc/nuts/blob/main/07.md https://github.com/cashubtc/nuts/blob/main/14.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://preimage007.github.io/