CVE-2025-65548: NUT-14 allows cashu tokens to be created with a preimage hash

Q: How do I fix CVE-2025-65548?

nutshell: upgrade to 0.18.0. Exact commands for each OS are on this page.

Q: Is CVE-2025-65548 being exploited?

CVE-2025-65548 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-65548 affect?

CVE-2025-65548 affects nutshell. Severity is critical (CVSS 9.1). 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 vu

Q: How urgent is CVE-2025-65548?

Priority 51/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

CRITICAL 9.1REMOTEUPGRADE

CVE-2025-65548 is a critical-severity flaw (CVSS 9.1) affecting nutshell. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-1284
Published	2025-12-08
Last modified	2026-10-18

Publisher (CNA): MITRE · Vendor: cashu

Last updated 2026-10-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-12-08 19:15 UTCPublished CVE record published
2026-10-18 14:10 UTCUpdated Record last modified

cashu nutshell UPGRADE

Affected: < 0.18.0

Fixed in: 0.18.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nutshell || rpm -q nutshell || nutshell --version

2. UPGRADE to 0.18.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nutshell

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nutshell

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-65548?

nutshell: upgrade to 0.18.0. Exact commands for each OS are on this page.

Is CVE-2025-65548 being exploited?

CVE-2025-65548 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-65548 affect?

CVE-2025-65548 affects nutshell. Severity is critical (CVSS 9.1). 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 vu

How urgent is CVE-2025-65548?

Priority 51/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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