Improper Authentication Handling in VictoriaMetrics Affects User Security
CVE-2026-19898

6.3MEDIUM

Key Information:

Vendor

VictoriaMetrics

Status
Victoriametrics
Vendor
CVE Published:
15 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-19898?

A vulnerability exists in the VMAuth Authentication Endpoint of VictoriaMetrics, specifically within the requestHandler function in app/vmauth/main.go. This flaw allows attackers to perform excessive authentication attempts, potentially leading to unauthorized access. The vulnerability can be exploited remotely, posing a significant risk to affected systems. It is advisable to upgrade to version 1.147.0 or later to mitigate this issue and apply the patch identified by the commit 119ba0fb5be8024d50c5ba946599b2e69e8803ea.

Affected Version(s)

VictoriaMetrics 1.146

VictoriaMetrics 1.147.0

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-2026-19898 - Proof of Concept

References

https://vuldb.com/vuln/390088
vdb-entrytechnical-description
https://vuldb.com/vuln/390088/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-19898
third-party-advisory

CVSS V4

Score:
6.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
None
Availability:
None
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

ZAST.AI (VulDB User)
.