CVE-2026-32588Public exploitNetwork attack vector

Authenticated service interruption via unthrottled bcrypt hashing

Published Apr 7, 2026 · Updated Apr 7, 2026

Resource exhaustion in Apache Cassandra 4.0, 4.1, and 5.0 allows remote authenticated users to interrupt CQL query service. CassandraRoleManager synchronously performs bcrypt password hashing for ALTER ROLE on the shared Dispatcher.requestExecutor without rate limiting, so repeated changes starve ordinary query work. The path requires CQL-port access, PasswordAuthenticator, and an account allowed to change a password; latency and timeouts subside when requests stop.

CVSS severity6.5
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Apache Cassandra 4.0, 4.1, and 5.0 allows remote authenticated users to interrupt CQL query service. CassandraRoleManager synchronously performs bcrypt password hashing for ALTER ROLE on the shared Dispatcher.requestExecutor without rate limiting, so repeated changes starve ordinary query work. The path requires CQL-port access, PasswordAuthenticator, and an account allowed to change a password; latency and timeouts subside when requests stop.

The record

CVE
CVE-2026-32588
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
The Apache Software Foundation
Product
Apache Cassandra
Classifications
CWE-400, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 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=4.0 <=4.0.19
  2. Affected versionversion=4.1 <=4.1.10
  3. Affected versionversion=5.0 <=5.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Cassandraversion=4.0 <=4.0.19; version=4.1 <=4.1.10; version=5.0 <=5.0.6

Published CVSS scores

4.3GitLab Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.3GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499Endpoint Denial of Service

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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