CVE-2026-82631valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after free
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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.
- CVSS
- 2.2 LOW (v3.1, CNA)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
- Weakness (CWE)
- CWE-416, CWE-119
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulDB
- NVD analysis
- Deferred
- Record last updated
- Aug 31, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
valkey-io valkey valkey-io:valkey | 9.1.0 | CNA record |
References
- https://vuldb.com/vuln/397129vdb-entry, technical-description
- https://vuldb.com/vuln/397129/ctisignature, permissions-required
- https://vuldb.com/cve/CVE-2026-82631third-party-advisory
- https://vuldb.com/submit/893793third-party-advisory
- https://github.com/valkey-io/valkey/issues/4198issue-tracking
- https://github.com/valkey-io/valkey/pull/4212issue-tracking, patch
- https://github.com/user-attachments/files/30111628/PoC.zipexploit
- https://github.com/valkey-io/valkey/commit/b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20bpatch
- https://github.com/valkey-io/valkey/product
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.