# CVE-2026-45133

## Summary

- **CVE ID:** CVE-2026-45133
- **Severity:** HIGH
- **CVSS Score:** 8.2 (CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-674, CWE-776, CWE-1333
- **Published:** Jul 14, 2026
- **Last Modified:** Jul 15, 2026

## Description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, when the parser is exposed to attacker-controlled input, deeply nested mappings or sequences cause both the block-level (Parser::parseBlock()) and inline (Inline::parseSequence() / Inline::parseMapping()) parsers to recurse without a depth limit. A crafted document exhausts the PHP stack and crashes the worker. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.

## Affected Products

- symfony — symfony (< 5.4.52)
- symfony — symfony (>= 6.0.0-BETA1, < 6.4.40)
- symfony — symfony (>= 7.0.0-BETA1, < 7.4.12)
- symfony — symfony (>= 8.0.0-BETA1, < 8.0.12)

## References

- [CNA](https://github.com/symfony/symfony/security/advisories/GHSA-c2p3-7m5p-cv8x)
- [CNA](https://github.com/symfony/symfony/releases/tag/v5.4.52)
- [CNA](https://github.com/symfony/symfony/releases/tag/v6.4.40)
- [CNA](https://github.com/symfony/symfony/releases/tag/v7.4.12)
- [CNA](https://github.com/symfony/symfony/releases/tag/v8.0.12)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.63%
- **EPSS Percentile:** 48.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._