CVE-2025-65548

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 v3.1 Score

9.1

CRITICAL

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

Weakness Type (CWE)

CWE-1284 CWE-1284

Affected Products

Vendor	Product	Versions
cashu	nutshell	< 0.18.0

References

Exploits

https://bitcointalk.org/index.php?topic=5564329 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://bitcointalk.org/index.php?topic=5564329 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

Other References

https://delvingbitcoin.org/t/public-disclosure-denial-of-service-using-htlc-in-cashu/2090 https://preimage007.github.io/

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2025-65548? +

CVE-2025-65548 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-65548? +

CVE-2025-65548 affects products from cashu, specifically: nutshell. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-65548? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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