CVE-2025-65548Public exploitNetwork attack vector

Storage exhaustion via oversized HTLC preimages

Published Dec 8, 2025 · Updated Dec 11, 2025

Input validation in Nutshell before 0.18.0 allows remote attackers to consume a mint's database and disk with oversized HTLC preimages. The _verify_htlc_spending_conditions routine decodes and hashes a supplied hexadecimal preimage without enforcing the 64-character limit added by the fix, after which the mint stores the witness. Remote unauthenticated submissions can repeat the write until storage is exhausted; the public record does not establish a crash or data loss.

CVSS severity9.1
Critical
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Input validation in Nutshell before 0.18.0 allows remote attackers to consume a mint's database and disk with oversized HTLC preimages. The _verify_htlc_spending_conditions routine decodes and hashes a supplied hexadecimal preimage without enforcing the 64-character limit added by the fix, after which the mint stores the witness. Remote unauthenticated submissions can repeat the write until storage is exhausted; the public record does not establish a crash or data loss.

The record

CVE
CVE-2025-65548
Published
Dec 8, 2025
Updated
Dec 11, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-1284, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 8, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1284Improper Validation of Specified Quantity in Input
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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