CVE-2025-65548
9.1
CRITICAL
CVSS 3.1
EPSS 0.12%
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.
How to fix CVE-2025-65548
To remediate CVE-2025-65548, upgrade the affected package to a fixed version below.
- PyPI/cashu—upgrade to 0.18.0 or later
Is CVE-2025-65548 being exploited?
Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.
Affected packages (1)
- from 0, < 0.18.0
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
References (6)
- EXPLOITgithub.com/cashubtc/nuts/blob/main/07.md
- EXPLOITgithub.com/cashubtc/nuts/blob/main/14.md
- EXPLOITgithub.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
- REPORTbitcointalk.org/index.php?topic=5564329