valkey-io valkey Blocked-on-keys blocked.c handleClientsBlockedOnKey use after free

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-82631
StatePUBLISHED
AssignerVulDB
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-31 08:17:03 UTC
Updated2026-08-31 20:57:16 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v4.0 1.2 LOW from [email protected]

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: 0.003580000 probability, percentile 0.288200000 (date 2026-09-02)

Problem Types: CWE-119 | CWE-416 | CWE-416 Use After Free | CWE-119 Memory Corruption

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary1.2LOWCVSS: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/C...
4.0CNADECLARED2.1LOWCVSS: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
3.1[email protected]Secondary2.2LOWCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L
3.1CNADECLARED2.2LOWCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
3.0CNADECLARED2.2LOWCVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
2.0[email protected]Secondary1.7AV:N/AC:H/Au:M/C:N/I:N/A:P
2.0CNADECLARED1.7AV:N/AC:H/Au:M/C:N/I:N/A:P/E:POC/RL:OF/RC:C

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Attack Requirements
None
Privileges Required
High
User Interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:L

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Valkey-io Valkey affected 9.1.0 Not specified

References

ReferenceSourceLinkTags
vuldb.com/submit/893793 [email protected] vuldb.com
vuldb.com/vuln/397129 [email protected] vuldb.com
vuldb.com/vuln/397129/cti [email protected] vuldb.com
github.com/valkey-io/valkey/commit/b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b [email protected] github.com
github.com/user-attachments/files/30111628/PoC.zip [email protected] github.com
github.com/valkey-io/valkey/issues/4198 [email protected] github.com
github.com/valkey-io/valkey/pull/4212 [email protected] github.com
vuldb.com/cve/CVE-2026-82631 [email protected] vuldb.com
github.com/valkey-io/valkey [email protected] github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: VULL (VulDB User) (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-08-30T00:00:00.000ZAdvisory disclosed
CNA2026-08-30T02:00:00.000ZVulDB entry created
CNA2026-08-30T12:15:38.000ZVulDB entry last update

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