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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.

PUBLISHED Reserved 2026-05-08 | Published 2026-07-14 | Updated 2026-07-14 | Assigner GitHub_M




HIGH: 8.2CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Problem types

CWE-674: Uncontrolled Recursion

CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

CWE-1333: Inefficient Regular Expression Complexity

Product status

< 5.4.52
affected

>= 6.0.0-BETA1, < 6.4.40
affected

>= 7.0.0-BETA1, < 7.4.12
affected

>= 8.0.0-BETA1, < 8.0.12
affected

References

github.com/...ymfony/security/advisories/GHSA-c2p3-7m5p-cv8x

github.com/symfony/symfony/releases/tag/v5.4.52

github.com/symfony/symfony/releases/tag/v6.4.40

github.com/symfony/symfony/releases/tag/v7.4.12

github.com/symfony/symfony/releases/tag/v8.0.12

cve.org (CVE-2026-45133)

nvd.nist.gov (CVE-2026-45133)

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