# Improper Input Validation in Symfony

Advisory record · `GHSA-w4rc-rx25-8m86`

- **Identifiers:** `GHSA-w4rc-rx25-8m86` · `CVE-2019-11325` · `PKSA-3wg8-7y1s-53jj` · `PKSA-qdcz-9b22-7g4s`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **Weakness (CWE):** [CWE-116](https://cwe.mitre.org/data/definitions/116.html)
- **Tags:** [CWE-116](https://agentprime.io/advisories/tag/cwe-116.md)
- **Published:** 12 Feb 2020
- **Updated:** 8 Nov 2023
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 12 Feb 2020, 18:44 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected packages

- `symfony/symfony` (Packagist): affected `>=4.2.0, <4.2.12 || >=4.3.0, <4.3.8`; fixed in `4.2.12`, `4.3.8`
- `symfony/var-exporter` (Packagist): affected `>=4.2.0, <4.2.12 || >=4.3.0, <4.3.8`; fixed in `4.2.12`, `4.3.8`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Symfony (symfony/symfony) versions 4.2.0 to before 4.2.12 and 4.3.0 to before 4.3.8, and symfony/var-exporter in the same ranges, are affected. The VarExport component escapes certain specially crafted strings incorrectly, which can let an attacker run arbitrary PHP code; the source does not describe what access or conditions an attacker needs. Upgrade symfony/symfony and symfony/var-exporter to 4.2.12, 4.3.8 or later.

Written 5 Nov 2026.

## 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

- 9.8 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.034, the 88th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:33 UTC: First seen by agentprime
- 31 Oct 2026, 14:33 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-w4rc-rx25-8m86)

## Sources

- [GitHub Advisory Database: GHSA-w4rc-rx25-8m86](https://github.com/advisories/GHSA-w4rc-rx25-8m86)
- [OSV: GHSA-w4rc-rx25-8m86](https://osv.dev/vulnerability/GHSA-w4rc-rx25-8m86)
- <https://nvd.nist.gov/vuln/detail/CVE-2019-11325>
- <https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2019-11325.yaml>
- <https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/var-exporter/CVE-2019-11325.yaml>
- <https://github.com/symfony/symfony/releases/tag/v4.3.8>
- <https://github.com/symfony/var-exporter/compare/d8bf442...57e00f3>
- <https://symfony.com/blog/cve-2019-11325-fix-escaping-of-strings-in-varexporter>
- <https://symfony.com/blog/symfony-4-3-8-released>
- <https://symfony.com/cve-2019-11325>

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-w4rc-rx25-8m86>, 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-w4rc-rx25-8m86/>. Everything for agents: <https://agentprime.io/llms.txt>.