CVE-2025-65548
CRITICALcashu/nutshell < 0.18.0 - Denial of Service via Unvalidated Preimage Size
Title source: llmDescription
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.
References (6)
Core 6
Core References
Exploit, Issue Tracking
https://bitcointalk.org/index.php?topic=5564329
Broken Link
https://delvingbitcoin.org/t/public-disclosure-denial-of-service-using-htlc-in-cashu/2090
Exploit, Third Party Advisory
https://github.com/cashubtc/nuts/blob/main/07.md
Exploit, Third Party Advisory
https://github.com/cashubtc/nuts/blob/main/14.md
Exploit, 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.md
Product
https://preimage007.github.io/
Scores
CVSS v3
9.1
EPSS
0.0036
EPSS Percentile
27.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
yes
Technical Impact
total
Details
CWE
CWE-1284
Status
published
Products (1)
cashu/nutshell
< 0.18.0
Published
Dec 08, 2025
Tracked Since
Feb 18, 2026