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CVE-2026-45133

HIGH
8.2
CVSS 4.0
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.

Metadata

CVE ID
CVE-2026-45133
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-05-08 20:08 UTC
Published
2026-07-14 18:45 UTC
Last updated
2026-07-15 13:25 UTC
Primary CWE
CWE-674
CWE-674: Uncontrolled Recursion
Vendor / Product
symfony / symfony
Sources
cve.org  ·  NVD

Severity & Metrics

8.2 HIGH CVSS 4.0
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
SSVC — CISA Coordinator
Exploitation
none
Automatable
no
Tech. Impact
partial
Affected products (1)
VendorProductPlatformVersions
symfony symfony — < 5.4.52, >= 6.0.0-BETA1, < 6.4.40, >= 7.0.0-BETA1, < 7.4.12, >= 8.0.0-BETA1, < 8.0.12
Weakness (CWE)
CWESourceDescription
CWE-1333 cna CWE-1333: Inefficient Regular Expression Complexity
CWE-674 cna CWE-674: Uncontrolled Recursion
CWE-776 cna CWE-776: Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.2 HIGH 4.0 cna 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
References (5)
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