Double Free Vulnerability in Valkey 9.1.0 from Valkey-io
CVE-2026-82677

4.8MEDIUM

Key Information:

Vendor

Valkey-io

Status
Valkey
Vendor
CVE Published:
31 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-82677?

A vulnerability has been identified in the Valkey 9.1.0 product from Valkey-io, specifically within the moduleTimerHandler function located in src/module.c. This flaw allows for a double free scenario, which can be exploited remotely, posing a significant risk. An exploit has been publicly disclosed, enabling potential attacks if the necessary patch is not applied. It is highly recommended that users implement the patch identified as b349fe2821e3998534b1454c1b64a478daf8c6b7 to mitigate this issue.

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-2026-82677 - Proof of Concept

References

https://vuldb.com/vuln/397172
vdb-entrytechnical-description
https://vuldb.com/vuln/397172/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-82677
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

VULL (VulDB User)
.