PT-2026-21584 · Valkey+1 · Valkey+1

Madolson + 1 · Published 2026-02-24 · Updated 2026-02-24 · CVE-2026-21864

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Valkey-Bloom versions prior to commit a68614b6e3845777d383b3a513cedcc08b3b7ccd

Description Valkey-Bloom is a Rust-based module for the Valkey distributed key-value database that implements a Bloom Filter data type. A specially crafted RESTORE command can cause an assertion failure, leading to server shutdown. This occurs because the Valkey-bloom module did not set the VALKEYMODULE OPTIONS HANDLE IO ERRORS flag, which is required for handling errors during RDB parsing. Without this flag, parsing errors trigger a system assertion and shut down the system. The RESTORE API endpoint is involved in this issue.

Recommendations Update to commit a68614b6e3845777d383b3a513cedcc08b3b7ccd or later. As a mitigation, disable the RESTORE command if it is not used by your application.

Exploit

Fix

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2026-21864

GHSA-MC2G-H759-3QW2

Affected Products

Valkey

Valkey-Bloom

References · 7

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/21xxx/CVE-2026-21864.json · Exploit
• https://github.com/valkey-io/valkey-bloom/commit/a68614b6e3845777d383b3a513cedcc08b3b7ccd · Patch
• https://github.com/valkey-io/valkey-bloom/security/advisories/GHSA-mc2g-h759-3qw2 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-21864 · Security Note
• https://osv.dev/vulnerability/CVE-2026-21864 · Vendor Advisory
• https://twitter.com/CVEnew/status/2026184659462451576 · Twitter Post
• https://t.me/cveNotify/152949 · Telegram Post