Vulnerability Report

CVE-2026-21864

Title: Assertion failure leading to DoS in Valkey-Bloom RESTORE command

Input Validation Error

Proof Of Concept

No public PoC currently indexed for CVE-2026-21864.

CWE Category CWE-20

Published Date Feb 24, 2026

Modified Date Feb 26, 2026

Exploit Status Not Found

Score 6.5 CVSS v3.1

Exploit Probability (EPSS)

0.26%

Vulnerability Summary

CVE-2026-21864: 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.

Impacted Vendors

lfprojects 1

Reference Links

https://github.com/valkey-io/valkey-bloom/commit/a68614b6e3845777d383b3a513cedcc08b3b7ccd https://github.com/valkey-io/valkey-bloom/security/advisories/GHSA-mc2g-h759-3qw2

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

6.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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