CVE-2026-24308Network attack vectorHinoki check available

Sensitive client configuration disclosure via INFO-level logging

Published Mar 7, 2026 · Updated Mar 7, 2026

Sensitive data exposure in Apache ZooKeeper 3.8.0 through 3.8.5 and 3.9.0 through 3.9.4 allows attackers to read sensitive client values from logs. ZKConfig writes client configuration values into the client's logfile at INFO level instead of excluding or redacting sensitive entries. Exploitation requires sensitive values to be present in client configuration and the emitted log entry to be accessible.

CVSS severity8.7
High
EPSS probability1.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Sensitive data exposure in Apache ZooKeeper 3.8.0 through 3.8.5 and 3.9.0 through 3.9.4 allows attackers to read sensitive client values from logs. ZKConfig writes client configuration values into the client's logfile at INFO level instead of excluding or redacting sensitive entries. Exploitation requires sensitive values to be present in client configuration and the emitted log entry to be accessible.

The record

CVE
CVE-2026-24308
Published
Mar 7, 2026
Updated
Mar 7, 2026
Vendor
The Apache Software Foundation
Product
Apache ZooKeeper
Classifications
CWE-117, CWE-532, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 7, 2026Record 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=3.8.0 <=3.8.5
  2. Affected versionversion=3.9.0 <=3.9.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache ZooKeeperversion=3.8.0 <=3.8.5; version=3.9.0 <=3.9.4

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
8.7GitHub Advisory DatabaseCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-117Improper Output Neutralization for Logs
CWE-532Insertion of Sensitive Information into Log File
T1005Data from Local System

Public exploit references

No public exploit references are available in this record.

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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