GHSA-v7m3-fpcr-h7m2 · Severity: high · Ecosystem: composer — Zumba Json Serializer has a potential PHP Object Injection via Unrestricted @type in unserialize()
Zumba Json Serializer is a library to serialize PHP variables in JSON format. In versions 3.2.2 and below, the library allows deserialization of PHP objects from JSON using a special @type field. The deserializer instantiates any class specified in the @type field without restriction. When processing untrusted JSON input, this behavior may allow an attacker to instantiate arbitrary classes available in the application. If a vulnerable application passes attacker-controlled JSON into JsonSerializer::unserialize() and contains classes with dangerous magic methods (such as __wakeup() or __destruct()), this may lead to PHP Object Injection and potentially Remote Code Execution (RCE), depending on available gadget chains in the application or its dependencies. This behavior is similar in risk profile to PHP's native unserialize() when used without the allowed_classes restriction. Applications are impacted only if untrusted or attacker-controlled JSON is passed into JsonSerializer::unserialize() and the application or its dependencies contain classes that can be leveraged as a gadget chain. This issue has been fixed in version 3.2.3. If an immediate upgrade isn't feasible, mitigate the vulnerability by never deserializing untrusted JSON with JsonSerializer::unserialize(), validating and sanitizing all JSON input before deserialization, and disabling @type-based object instantiation wherever possible.
Conclusion & alert: CVE-2026-27206 is rated Moderate Risk (43.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.14%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-04-21 | 0.39% | 0.14% | -0.25% |
| 2 | 2026-02-27 | 0.29% | 0.39% | +0.09% |
| 3 | 2026-02-21 | — | 0.29% | — |
Full EPSS history (3 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 8.1 | 3.1 | HIGH |
|
2.2 | 5.9 | [email protected] |
GHSA-v7m3-fpcr-h7m2 · Severity: high · Ecosystem: composer — Zumba Json Serializer has a potential PHP Object Injection via Unrestricted @type in unserialize()
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2026-27206 not yet assigned priority: Debian including 1 source packages (php-zumba-json-serializer), 4 status rows across 4 suites (bookworm, forky, sid, trixie): open 2, resolved 2. | https://security-tracker.debian.org/tracker/CVE-2026-27206 |
ubuntu
|
medium | CVE-2026-27206 medium priority: Ubuntu including 1 source packages (php-zumba-json-serializer), 4 status rows across 4 suites (jammy, noble, questing, upstream): needs-triage 3, DNE 1. | https://ubuntu.com/security/CVE-2026-27206 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| No affected products in dataset. | |||