UBUNTU-CVE-2026-45065
A vulnerability in the Symfony PHP framework's UrlGenerator component prior to versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12 allows route parameters to be improperly validated. This improper validation can cause certain values, such as //evil.com, to bypass common locale requirements and generate protocol-relative off-site URLs. This issue has been fixed in the specified versions.
AI Analysis
Technical Summary
Symfony's UrlGenerator validates route parameters against a pattern constructed as ^ plus the raw requirement plus $. However, with ungrouped alternations, middle alternatives match as unanchored substrings. This flaw allows values like //evil.com to satisfy locale requirements incorrectly, enabling the generation of protocol-relative off-site URLs. The vulnerability affects multiple Symfony versions prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, where the issue is resolved.
Potential Impact
The vulnerability can lead to the generation of protocol-relative off-site URLs by bypassing locale validation in route parameters. This could potentially be abused to redirect users to malicious external sites or conduct phishing attacks. No direct evidence of known exploits in the wild is reported.
Mitigation Recommendations
A fix is available in Symfony versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12. Users should upgrade to these or later versions to remediate the vulnerability. No vendor advisory content contradicts this; therefore, upgrading is the recommended mitigation.
UBUNTU-CVE-2026-45065
Description
A vulnerability in the Symfony PHP framework's UrlGenerator component prior to versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12 allows route parameters to be improperly validated. This improper validation can cause certain values, such as //evil.com, to bypass common locale requirements and generate protocol-relative off-site URLs. This issue has been fixed in the specified versions.
CVSS v4.0
Affected software
pkg:deb/ubuntu/[email protected]?arch=source&distro=xenialpkg:deb/ubuntu/[email protected]+dfsg-1ubuntu0.1+esm2?arch=source&distro=esm-apps/bionicpkg:deb/ubuntu/[email protected]+dfsg-1ubuntu1+esm2?arch=source&distro=esm-apps/focalpkg:deb/ubuntu/[email protected]+dfsg-1ubuntu8+esm1?arch=source&distro=esm-apps/jammypkg:deb/ubuntu/[email protected]+dfsg-3ubuntu3+esm1?arch=source&distro=esm-apps/noblepkg:deb/ubuntu/[email protected]+dfsg-1?arch=source&distro=questingpkg:deb/ubuntu/[email protected]+dfsg-1ubuntu1?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Symfony's UrlGenerator validates route parameters against a pattern constructed as ^ plus the raw requirement plus $. However, with ungrouped alternations, middle alternatives match as unanchored substrings. This flaw allows values like //evil.com to satisfy locale requirements incorrectly, enabling the generation of protocol-relative off-site URLs. The vulnerability affects multiple Symfony versions prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12, where the issue is resolved.
Potential Impact
The vulnerability can lead to the generation of protocol-relative off-site URLs by bypassing locale validation in route parameters. This could potentially be abused to redirect users to malicious external sites or conduct phishing attacks. No direct evidence of known exploits in the wild is reported.
Mitigation Recommendations
A fix is available in Symfony versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12. Users should upgrade to these or later versions to remediate the vulnerability. No vendor advisory content contradicts this; therefore, upgrading is the recommended mitigation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-45065
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:Pro:22.04:LTS","Ubuntu:Pro:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 4.0
Threat ID: 6a58b4b168715ace43da95ca
Added to database: 07/16/2026, 10:38:41 UTC
Last enriched: 07/16/2026, 12:49:56 UTC
Last updated: 07/16/2026, 12:49:56 UTC
Views: 2
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