PYSEC-2025-89
See a problem?- Import Source
- https://github.com/pypa/advisory-database/blob/main/vulns/cashu/PYSEC-2025-89.yaml
- JSON Data
- https://api.osv.dev/v1/vulns/PYSEC-2025-89
- Aliases
- Published
- 2025-12-08T19:15:50.677Z
- Modified
- 2026-05-20T09:18:54.109140Z
- Severity
-
- 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
- Summary
- [none]
- Details
-
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
-
- https://delvingbitcoin.org/t/public-disclosure-denial-of-service-using-htlc-in-cashu/2090
- https://preimage007.github.io/
- 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
Affected packages
PyPI / cashu
Package
- Name
- cashu
- View open source insights on deps.dev
- Purl
- pkg:pypi/cashu
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed0.18.0
Affected versions
0.*
0.1
0.1.1
0.1.2
0.1.3
0.1.4
0.1.5
0.1.6
0.1.7
0.1.8
0.1.9
0.1.10
0.2.0
0.2.1
0.2.2
0.2.3
0.2.4
0.2.5
0.2.6
0.3.0
0.3.1
0.3.2
0.4.0
0.4.1
0.4.2
0.5.0
0.5.1
0.5.3
0.5.4
0.5.5
0.6.0
0.7.0
0.8
0.8.1
0.8.2
0.8.3
0.9.0
0.9.1
0.9.2
0.9.3
0.9.4
0.10.0
0.11.0
0.12.0
0.12.1
0.12.3
0.13.0
0.14.0
0.14.1
0.15.0
0.15.1
0.15.2
0.15.3
0.16.0
0.16.1
0.16.2
0.16.3
0.16.4
0.16.5
0.17.0