Is this vulnerability remotely exploitable?

It can be, if a remote attacker can send JSON that is passed directly or indirectly into `JsonSerializer::unserialize()` without being fully validated or sanitized. In such cases, the issue becomes remotely exploitable via the exposed JSON interface.

What level of access does an attacker need to exploit this?

The attacker needs the ability to control or significantly influence the JSON input used by `JsonSerializer::unserialize()`. This often means access to an HTTP API, message queue, or other input channel whose data is deserialized without strict trust checks.

What is the safest general fix pattern for affected applications?

The safest pattern is to stop deserializing untrusted JSON into arbitrary objects. Instead, parse JSON into arrays or simple value objects, then explicitly construct necessary domain objects on the server. Where object deserialization is unavoidable, use strict allowlists for types and avoid exposing `@type` to client control.

Severity:

HIGH RISK

(8.1)

PHP Object Injection via JSON Deserialization (CWE-502) in Zumba Json Serializer

CVE-2026-27206

Published:

Feb 21, 2026

Status:

Awaiting Analysis

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:

Unsafe Deserialization

CWE:

CWE-502

Impact:

PHP Object Injection leading to Potential Remote Code Execution

Severity:

HIGH RISK

(8.1)

CVSS Version:

3.1

Vulnerability Type

Category:

Unsafe Deserialization

CWE:

CWE-502

Impact:

PHP Object Injection leading to Potential Remote Code Execution

Severity:

HIGH RISK

(8.1)

CVSS Version:

3.1

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355 Bryant St. San Francisco, CA 94107, USA

Ask AI for summary of CodeAnt

PHP Object Injection via JSON Deserialization (CWE-502) in Zumba Json Serializer

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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