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

CVE-2026-82631 is fixed in 4 products on 1 platform, first by DEBIAN-CVE-2026-82631, released September 17, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-82631
- Priority: Routine
- CVSS: 2.2 (Low)
- EPSS: 0.0036
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 31, 2026
- Weakness: Use After Free
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-82631

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | valkey Debian 13.5 (trixie) | 8.1.1+dfsg1-3+deb13u3 | [DEBIAN-CVE-2026-82631](https://patchblox.com/security/data/fix/linux/debian-cve-2026-82631.md) | Sep 17, 2026 |
| Linux | valkey Debian 14 | 9.1.2-1 | [DEBIAN-CVE-2026-82631](https://patchblox.com/security/data/fix/linux/debian-cve-2026-82631.md) | Sep 17, 2026 |
| Linux | valkey amzn 2023 | 9.0.6-1.amzn2023.0.1 | [ALAS2023-2026-3091](https://patchblox.com/security/data/fix/linux/alas2023-2026-3091.md) | Sep 28, 2026 |
| Linux | valkey-debuginfo amzn 2023 | 9.0.6-1.amzn2023.0.1 | [ALAS2023-2026-3091](https://patchblox.com/security/data/fix/linux/alas2023-2026-3091.md) | Sep 28, 2026 |
| Linux | valkey-debugsource amzn 2023 | 9.0.6-1.amzn2023.0.1 | [ALAS2023-2026-3091](https://patchblox.com/security/data/fix/linux/alas2023-2026-3091.md) | Sep 28, 2026 |
| Linux | valkey-devel amzn 2023 | 9.0.6-1.amzn2023.0.1 | [ALAS2023-2026-3091](https://patchblox.com/security/data/fix/linux/alas2023-2026-3091.md) | Sep 28, 2026 |

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Data as of 2026-11-09T19:38:12Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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