valkey-io valkey 9.1.0 Blocked-on-keys Subsystem src/blocked.c handleClientsBlockedOnKey use after free

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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2.0$0-$5k0.00

Summaryinfo

A vulnerability was found in valkey-io valkey 9.1.0. It has been classified as problematic. The impacted element is the function handleClientsBlockedOnKey of the file src/blocked.c of the component Blocked-on-keys Subsystem. This manipulation causes use after free. The identification of this vulnerability is CVE-2026-82631. It is possible to initiate the attack remotely. Furthermore, there is an exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability has been found in valkey-io valkey 9.1.0 and classified as problematic. Affected by this vulnerability is the function handleClientsBlockedOnKey of the file src/blocked.c of the component Blocked-on-keys Subsystem. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect availability.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-82631. The exploitation appears to be difficult. The attack can be launched remotely. Additional levels of successful authentication are needed for exploitation. Technical details and also a public exploit are known.

It is possible to download the exploit at github.com. It is declared as proof-of-concept.

Applying the patch b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-68393). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 2.2
VulDB Meta Temp Score: 2.0

VulDB Base Score: 2.2
VulDB Temp Score: 2.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b

Timelineinfo

08/30/2026 Advisory disclosed
08/30/2026 +0 days VulDB entry created
08/31/2026 +1 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 4198
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2026-82631 (🔒)
GCVE (CVE): GCVE-0-2026-82631
GCVE (VulDB): GCVE-100-397129
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 08/30/2026 12:15
Updated: 08/31/2026 15:07
Changes: 08/30/2026 12:15 (61), 08/31/2026 15:07 (1)
Complete: 🔍
Submitter: VULL
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #893793: Valkey Project Valkey 9.1.0 Heap Use After Free (by VULL)

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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