Fluid Attacks Database

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.

Mitigation

Update Impact

Minimal update. May introduce new vulnerabilities or breaking changes.

Ecosystem	Package	Affected version	Patched versions
pypi	cashu	=0.1 \|\| =0.1.1 \|\| =0.1.10 \|\| =0.1.2 \|\| =0.1.3 \|\| =0.1.4 \|\| =0.1.5 \|\| =0.1.6 \|\| =0.1.7 \|\| =0.1.8 \|\| =0.1.9 \|\| =0.10.0 \|\| =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 \|\| =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 <0.18.0	0.18.0

Aliases

1. CVE-2025-655482. NVD-2025-655483. OSV-PYSEC-2025-894. OSV-2025-655485. GCVE-2025-65548

References

1. https://delvingbitcoin.org/t/public-disclosure-denial-of-service-using-htlc-in-cashu/20902. https://preimage007.github.io/3. https://bitcointalk.org/index.php?topic=5564329

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