CVE-2026-45065

Symfony: UrlGenerator Route-Requirement Bypass via Unanchored Regex Alternation → Off-Site //host URL Injection

State: Published
Severity: 2.3 Low
Published: Jul 14, 2026
Updated: Jul 14, 2026
Reserved: May 8, 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, UrlGenerator validates route parameters against a pattern built as ^ plus the raw requirement plus $; with ungrouped alternations, middle alternatives match as unanchored substrings, allowing a value such as //evil.com to satisfy a common locale requirement and generate a protocol-relative off-site URL. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.

Scores

CVSS	Score	Vector	Source
4.0	2.3 Low	CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N	GitHub_M

Weaknesses

CWE-185 Incorrect Regular Expression
CWE-601 URL Redirection to Untrusted Site ('Open Redirect')

Affected Products

Product	Versions
symfonysymfony	< 5.4.52Affected >= 6.0.0-BETA1, < 6.4.40Affected >= 7.0.0-BETA1, < 7.4.12Affected >= 8.0.0-BETA1, < 8.0.12Affected

References

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