CVE-2025-65548

Summary

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.

Affected Software

Weaknesses

• n/a

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: yes
  • Technical Impact: total

Additional References

• 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
• https://bitcointalk.org/index.php?topic=5564329

References

• https://delvingbitcoin.org/t/public-disclosure-denial-of-service-using-htlc-in-cashu/2090
• https://github.com/cashubtc/nuts/blob/main/14.md
• https://github.com/cashubtc/nuts/blob/main/07.md
• https://preimage007.github.io/
• 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
• https://bitcointalk.org/index.php?topic=5564329

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