CVE-2024-36400Public exploitNetwork attack vector

Predictable identifiers via truncated character sets

Published Jun 4, 2024 · Updated Aug 2, 2024

Insufficient entropy in viz-rs Nano ID before 0.4.0 allows attackers to predict IDs generated for security-sensitive uses. The gen macro masks each random byte with alphabet length minus one, so base62 uses only 32 symbols and base58 only 16. Exposure arises when an application uses an affected generator for session tokens or other security identifiers, enabling brute-force guessing.

CVSS severity9.4
Critical
EPSS probability0.75%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Insufficient entropy in viz-rs Nano ID before 0.4.0 allows attackers to predict IDs generated for security-sensitive uses. The gen macro masks each random byte with alphabet length minus one, so base62 uses only 32 symbols and base58 only 16. Exposure arises when an application uses an affected generator for session tokens or other security identifiers, enabling brute-force guessing.

The record

CVE
CVE-2024-36400
Published
Jun 4, 2024
Updated
Aug 2, 2024
Vendor
viz-rs
Product
Nano ID
Classifications
CWE-331, T1110
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 4, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.4.0
  2. Affected versionversion=< 0.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

viz-rs · Nano IDversion=0 <0.4.0; version=< 0.4.0

Published CVSS scores

9.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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-331Insufficient Entropy
T1110Brute Force

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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