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CVE-2026-21864— Remote DoS from malformed RESTORE command

Quick assessment

Affected
valkey-io valkey-bloom
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

valkey-bloom是Valkey开源的一个Valkey模块。 Valkey-Bloom存在输入验证错误漏洞，该漏洞源于未设置处理RDB解析错误的标志，可能导致特制RESTORE命令触发断言使服务器关闭。

CVSS 6.5 · Medium EPSS 0.30% · P23

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-21864

Vulnerability Information
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Vulnerability Title
Remote DoS from malformed RESTORE command
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
valkey-bloom 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
valkey-bloom是Valkey开源的一个Valkey模块。 Valkey-Bloom存在输入验证错误漏洞，该漏洞源于未设置处理RDB解析错误的标志，可能导致特制RESTORE命令触发断言使服务器关闭。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
valkey-io valkey-bloom < a68614b6e3845777d383b3a513cedcc08b3b7ccd -

II. Public POCs for CVE-2026-21864

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III. Intelligence Information for CVE-2026-21864

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Vendor Advisories for CVE-2026-21864 (1)

IV. Related Vulnerabilities

Same vendor: valkey-io
Same weakness: CWE-20