CVE-2026-21864Public exploitNetwork attack vector

Server shutdown via unhandled RESTORE parse error

Published Feb 24, 2026 · Updated Feb 24, 2026

Improper input validation in Valkey valkey-bloom before 1.0.1 allows remote authenticated users to shut down the server via RESTORE. The module parses malformed RDB data but fails to enable HANDLE_IO_ERRORS, so Valkey converts the reported parse error into a fatal assertion. Access to the RESTORE command is required; successful exploitation terminates the Valkey server without reported confidentiality or integrity impact.

CVSS severity6.5
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Valkey valkey-bloom before 1.0.1 allows remote authenticated users to shut down the server via RESTORE. The module parses malformed RDB data but fails to enable HANDLE_IO_ERRORS, so Valkey converts the reported parse error into a fatal assertion. Access to the RESTORE command is required; successful exploitation terminates the Valkey server without reported confidentiality or integrity impact.

The record

CVE
CVE-2026-21864
Published
Feb 24, 2026
Updated
Feb 24, 2026
Vendor
Valkey
Product
valkey-bloom
Classifications
CWE-20, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 24, 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=< a68614b6e3845777d383b3a513cedcc08b3b7ccd

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Valkey · valkey-bloomversion=< a68614b6e3845777d383b3a513cedcc08b3b7ccd

Published CVSS scores

6.5GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
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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