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CVE-2026-45065

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

MEDIUM
6.1
CVSS Score
Published: July 14, 2026 at 05:43 PM UTC
Updated: July 15, 2026 at 02:44 PM UTC
2 products affected across 2 vendorsSymfonySymfony

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Severity
MEDIUM6.1
Exploit prediction
EPSS 0.3%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Symfony· Sensiolabsdrupal
95%
v < 5.4.526.0.0 ≤ v < 6.4.407.0.0 ≤ v < 7.4.128.0.0 ≤ v < 8.0.12
Affected range stops below 5.4.52, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.40, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.4.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.12, so it looks safe — our inference, not a vendor statement
Symfony· Symfonycomposer
60%
v < 5.4.52v < 6.4.40v < 7.4.12v < 8.0.12
Affected range stops below 5.4.52, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.40, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.4.12, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.12, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

x_refsource_CONFIRMPatchVendor Advisory
Source: cverecord
https://github.com/symfony/symfony/security/advisories/GHSA-72xp-p242-47p9
x_refsource_MISCProductRelease Notes
Source: cverecord
https://github.com/symfony/symfony/releases/tag/v5.4.52
x_refsource_MISCProductRelease Notes
Source: cverecord
https://github.com/symfony/symfony/releases/tag/v6.4.40
x_refsource_MISCProductRelease Notes
Source: cverecord
https://github.com/symfony/symfony/releases/tag/v7.4.12
x_refsource_MISCProductRelease Notes
Source: cverecord
https://github.com/symfony/symfony/releases/tag/v8.0.12

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-185CWE-601

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