CVE-2026-82631
valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after free
- State
- Published
- Severity
- 2.1 Low
- Published
- Aug 31, 2026
- Updated
- Aug 31, 2026
- Reserved
- Aug 30, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 2.1 Low | CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P | VulDB |
| 3.1 | 2.2 Low | CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C | VulDB |
| 3.0 | 2.2 Low | CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C | VulDB |
| 2.0 | 1.7 Low | AV:N/AC:H/Au:M/C:N/I:N/A:P/E:POC/RL:OF/RC:C | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
valkeyvalkey-io |
|
References
- VDB-397129 | valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after freevdb-entrytechnical-description
- VDB-397129 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- CVE-2026-82631 | CVE Analysis and Reportthird-party-advisory
- Submit #893793 | Valkey Project Valkey 9.1.0 Heap Use After Freethird-party-advisory
- https://github.com/valkey-io/valkey/issues/4198issue-tracking
- https://github.com/valkey-io/valkey/pull/4212issue-trackingpatch
- https://github.com/user-attachments/files/30111628/PoC.zipexploit
- https://github.com/valkey-io/valkey/commit/b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20bpatch
- https://github.com/valkey-io/valkey/product
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