CVE-2025-65548

Name: CVE-2025-65548
Creator: NVD / NIST
Published: 2025-12-08T19:15:50.677+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2025-65548 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

0.36%

27.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1284

Affected Software

Vendor	Product	Versions
Cashu	Nutshell	< 0.18.0

References

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

Timeline

Published: Dec 8, 2025
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2025-65548?

How severe is CVE-2025-65548?

CVE-2025-65548 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2025-65548?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2025-65548?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST