# Zumba Json Serializer has a potential PHP Object Injection via Unrestricted @type in unserialize()

Advisory record · `GHSA-v7m3-fpcr-h7m2`

- **Identifiers:** `GHSA-v7m3-fpcr-h7m2` · `CVE-2026-27206` · `PKSA-zhg7-9xn9-qv5j`
- **State:** Confirmed
- **Severity:** CVSS 8.1 High
- **Critical:** No
- **Weakness (CWE):** [CWE-502](https://cwe.mitre.org/data/definitions/502.html)
- **Tags:** [Insecure deserialization](https://agentprime.io/advisories/tag/deserialization.md)
- **Published:** 19 Feb 2026
- **Updated:** 23 Feb 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 19 Feb 2026, 22:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `zumba/json-serializer` (Packagist): affected `<3.2.3`; fixed in `3.2.3`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 8.1 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0084, the 58th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:26 UTC: First seen by agentprime
- 31 Oct 2026, 14:26 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-v7m3-fpcr-h7m2)

## Sources

- [GitHub Advisory Database: GHSA-v7m3-fpcr-h7m2](https://github.com/advisories/GHSA-v7m3-fpcr-h7m2)
- [OSV: GHSA-v7m3-fpcr-h7m2](https://osv.dev/vulnerability/GHSA-v7m3-fpcr-h7m2)
- <https://github.com/zumba/json-serializer/security/advisories/GHSA-v7m3-fpcr-h7m2>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-27206>
- <https://github.com/zumba/json-serializer/commit/bf26227879adefce75eb9651040d8982be97b881>
- <https://github.com/zumba/json-serializer>
- <https://github.com/zumba/json-serializer/releases/tag/3.2.3>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-v7m3-fpcr-h7m2>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-v7m3-fpcr-h7m2/>. Everything for agents: <https://agentprime.io/llms.txt>.