Use After Free Vulnerability in valkey-io's Valkey Product
CVE-2026-82631

2.1LOW

Key Information:

Vendor

Valkey-io

Status
Valkey
Vendor
CVE Published:
31 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-82631?

A security flaw has been identified in the Valkey product by valkey-io, specifically within the Blocked-on-keys Subsystem. The vulnerability arises from the function handleClientsBlockedOnKey located in the file src/blocked.c, leading to a use after free condition. This flaw allows attackers to exploit the system remotely, posing significant risks. The complexity of the attack is categorized as high, making exploitation challenging without prior knowledge. A patch addressing this issue has been released, identified as b2fb0e13f5b4c8c2fb63dcfc2c37a067a0d6d20b, and applying this patch is crucial to mitigate potential threats.

Affected Version(s)

valkey 9.1.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-82631 - Proof of Concept

References

https://vuldb.com/vuln/397129
vdb-entrytechnical-description
https://vuldb.com/vuln/397129/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-82631
third-party-advisory

CVSS V4

Score:
2.1
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

VULL (VulDB User)
.