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CVE-2026-82631— valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after free

Quick assessment

Affected

valkey-io valkey

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是Valkey组织开源的一个灵活的分布式键值数据库。 Valkey 9.1.0版本存在安全漏洞，该漏洞源于Blocked-on-keys Subsystem组件src/blocked.c文件中handleClientsBlockedOnKey函数存在释放后重用问题，可能导致拒绝服务。

CVSS 2.2 · Low EPSS 0.36% · P30 Updated Aug 31, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

Vendor	Product	Version Range	Status
valkey-io	valkey	`9.1.0`	affected

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I. Basic Information for CVE-2026-82631

Vulnerability Information

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Vulnerability Title

valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after free

Source: CVE Program / CVE List V5

Vulnerability Description

A security flaw has been discovered in valkey-io valkey 9.1.0. The affected element is the function handleClientsBlockedOnKey of the file src/blocked.c of the component Blocked-on-keys Subsystem. The manipulation results in use after free. The attack may be performed from remote. A high complexity level is associated with this attack. The exploitability is described as difficult. The exploit has been released to the public and may be used for attacks. The patch is identified as b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b. Applying a patch is advised to resolve this issue.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

释放后使用

Source: CVE Program / CVE List V5

Vulnerability Title

Valkey 缓冲区错误漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

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	9.1.0	`cpe:2.3:a:valkey-io:valkey::::::::`

II. Public POCs for CVE-2026-82631

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-82631

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Patches & Fixes for CVE-2026-82631 (2)

Other References for CVE-2026-82631 (5)

🔗 [SECURITY] Server-side `heap-use-after-free` in ready-key blocked-client iteration (`BLOCKED_MODULE` / `CLIENT KILL` reentrancy) · Issue #4198 · valkey-io/valkey Read full article issue-tracking
🔗 GitHub - valkey-io/valkey: A flexible distributed key-value database that is optimized for caching and other realtime workloads. · GitHub Read full article product
🔗 CVE-2026-82631 in valkey third-party-advisory
🔗 Submit #893793: Valkey Project Valkey 9.1.0 Heap Use After Free Read full article third-party-advisory
🔗 CVE-2026-82631 valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after free vdb-entry technical-description

Other References for CVE-2026-82631 (1)

https://github.com/user-attachments/files/30111628/PoC.zip exploit

https://www.cve.org/CVERecord?id=CVE-2026-82631

IV. Related Vulnerabilities

Same product: valkey

Same vendor: valkey-io

Same weakness: CWE-416