CVE-2025-65548

Cashu Nutshell vulnerability

9.1 CRITICALPublic exploitEPSS 0.42%

Published8 Dec 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityNone

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

Affected products

Cashu Nutshell< 0.18.0

Remediation

Fixed in

Cashu Nutshell≥ 0.18.0

References

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

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2025-65548 being actively exploited?

CVE-2025-65548 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.42%.

How severe is CVE-2025-65548?

CVE-2025-65548 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.42% probability of exploitation.

Which products are affected by CVE-2025-65548?

Affected products include Cashu Nutshell.

How do I fix CVE-2025-65548?

Upgrade affected software to a fixed version, for example Cashu Nutshell 0.18.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-65548 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.