Is this vulnerability remotely exploitable?

Yes. Any actor with network access to the Valkey instance and the ability to send crafted request sequences can potentially trigger the assertion and crash the server.

Does exploitation require authentication or valid credentials?

Typically no. The issue resides in low-level request handling, so the attacker generally only needs the ability to open a connection and send protocol-level traffic; no data-level authentication is required unless you front Valkey with an additional access-control layer.

What is the safest general fix pattern for this kind of bug?

The most robust fix pattern is to ensure complete state reset after handling each request (especially empty or invalid ones), replace assertions in externally reachable paths with graceful error handling, and strictly validate all incoming protocol messages before updating shared state.

Severity:

HIGH RISK

(7.5)

Improper Input Validation (CWE-20) Causes Assertion Abort in Valkey Request Handling

CVE-2026-27623

Published:

Feb 23, 2026

Status:

Analyzed

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

Remote Code Execution on the Router

April 6, 2026

CWE-77;CWE-78

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Remote Code Execution on Router Firmware

April 6, 2026

Vulnerability Type

Category:

Improper Input Validation

CWE:

CWE-20

Impact:

Denial of Service via Server Abort

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Input Validation

CWE:

CWE-20

Impact:

Denial of Service via Server Abort

Severity:

HIGH RISK

(7.5)

CVSS Version:

3.1

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355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

Improper Input Validation (CWE-20) Causes Assertion Abort in Valkey Request Handling

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setGameSpeedCfg CGI Handler

HIGH RISK

HIGH

(7.3)

OS Command Injection (CWE-78) in Totolink A7100RU setFirewallType Handler

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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