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.
References9
- github.com/user-attachments/files/30111628/PoC.zip
- github.com/valkey-io/valkey/
- github.com/valkey-io/valkey/commit/b2fb0e13f5b4c8c2fb63dcfc2c37…
- github.com/valkey-io/valkey/issues/4198
- github.com/valkey-io/valkey/pull/4212
- vuldb.com/cve/CVE-2026-82631
- vuldb.com/submit/893793
- vuldb.com/vuln/397129
- vuldb.com/vuln/397129/cti
Metrics
- CVSS 3.1
-
2.2
LOW
Score source: CNA
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L - CVSS 4.0
-
1.2
LOW
Score source: CNA
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 0% percentile: 30 · as of 8 November 2026
- CWE
- CWE-119CWE-416
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.