What is the CVSS score of CVE-2026-21864?

CVE-2026-21864 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.1%.

Which versions of Valkey Bloom are affected by CVE-2026-21864?

Organizations using Valkey-Bloom should be aware of notable risk from CVE-2026-21864, a input validation vulnerability rated CVSS 6.5.. A patch is available.

How to fix or mitigate CVE-2026-21864?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Vendor patch is available.

Valkey Bloom CVE-2026-21864

MEDIUM

Improper Input Validation (CWE-20)

2026-02-24 security-advisories@github.com

Code Injection Valkey Bloom

6.5

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

6.5 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

Patch released

Feb 26, 2026 - 16:04 nvd

Patch available

CVE Published

Feb 24, 2026 - 01:16 nvd

MEDIUM 6.5

DescriptionGitHub Advisory

Valkey-Bloom is a Rust based Valkey module which brings a Bloom Filter (Module) data type into the Valkey distributed key-value database. Prior to commit a68614b6e3845777d383b3a513cedcc08b3b7ccd, a specially crafted RESTORE command can cause Valkey to hit an assertion, causes the server to shutdown. Valkey modules are required to handle errors in RDB parsing by using VALKEYMODULE_OPTIONS_HANDLE_IO_ERRORS flag. If this flag is not set, errors encountered during parsing result in a system assertion which shuts down the system. Even though the Valkey-bloom module correctly handled the parsing, it did not originally set the flag. Commit a68614b6e3845777d383b3a513cedcc08b3b7ccd contains a patch. One may mitigate this defect by disabling the RESTORE command if it is unused by one's application.

AnalysisAI

Denial of service in Valkey-Bloom module allows authenticated attackers to crash the Valkey server by sending a specially crafted RESTORE command that triggers an unhandled assertion. The vulnerability exists because the module failed to set the IO_ERRORS flag during RDB parsing, causing the server to shut down instead of gracefully handling the malformed input. A security patch is available, and administrators can mitigate the issue by disabling the RESTORE command if not required.

Technical ContextAI

Classified as CWE-20 (Improper Input Validation). Affects Valkey-Bloom. Valkey-Bloom is a Rust based Valkey module which brings a Bloom Filter (Module) data type into the Valkey distributed key-value database. Prior to commit a68614b6e3845777d383b3a513cedcc08b3b7ccd, a specially crafted RESTORE command can cause Valkey to hit an assertion, causes the server to shutdown. Valkey modules are required to handle errors in RDB parsing by using VALKEYMODULE_OPTIONS_HANDLE_IO_ERRORS flag. If this flag is not set, errors encountered during parsing result in a system asse