CVE-2026-45133

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.

• CWE-674
• CWE-776
• CWE-1333

• https://github.com/symfony/symfony/releases/tag/v5.4.52Product, Release Notes
• https://github.com/symfony/symfony/releases/tag/v6.4.40Product, Release Notes
• https://github.com/symfony/symfony/releases/tag/v7.4.12Product, Release Notes
• https://github.com/symfony/symfony/releases/tag/v8.0.12Product, Release Notes
• https://github.com/symfony/symfony/security/advisories/GHSA-c2p3-7m5p-cv8xPatch, Vendor Advisory

Published

Jul 14, 2026

Last Modified

Jul 15, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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