valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after free
28Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 2.1epss 0.4%
exploitation probability
0.4%top 70% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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: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
Affected products
valkey-io · valkeypublic PoCs found — 1
cve_referencegithub.com/user-attachments/files/30111628/PoC.zipunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
References
https://github.com/user-attachments/files/30111628/PoC.ziphttps://github.com/valkey-io/valkey/https://github.com/valkey-io/valkey/commit/b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20bhttps://github.com/valkey-io/valkey/issues/4198https://github.com/valkey-io/valkey/pull/4212https://vuldb.com/cve/CVE-2026-82631https://vuldb.com/submit/893793https://vuldb.com/vuln/397129https://vuldb.com/vuln/397129/cti