CVE-2026-45070 Details
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, Symfony\Component\Mime\Header\ParameterizedHeader validates and encodes parameter values but emits parameter names verbatim, allowing a caller that derives a parameter name from untrusted input to include CRLF or other non-token bytes and inject additional headers into rendered structured mail headers such as Content-Type or Content-Disposition. This issue is reported as fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.
A vulnerability in the Symfony Mime component's ParameterizedHeader class allows for email header injection via parameter names derived from untrusted input. This issue is present in Symfony versions prior to 5.4.52, 6.4.40, 7.4.12, and 8.0.12. The vulnerability arises because the header serialization process validates and encodes parameter values but emits parameter names verbatim, creating an opportunity to inject additional headers into structured mail headers like Content-Type or Content-Disposition.
Users can upgrade to Symfony versions 5.4.52, 6.4.40, 7.4.12, or 8.0.12 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 16, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/symfony/symfony/commit/e62ea217f8b4ca8ae922ad0f949e0c4dc1f9b613 | [email protected] | Patch |
| https://github.com/symfony/symfony/releases/tag/v5.4.52 | [email protected] | ProductRelease Notes |
| https://github.com/symfony/symfony/releases/tag/v6.4.40 | [email protected] | ProductRelease Notes |
| https://github.com/symfony/symfony/releases/tag/v7.4.12 | [email protected] | ProductRelease Notes |
| https://github.com/symfony/symfony/releases/tag/v8.0.12 | [email protected] | ProductRelease Notes |
| https://github.com/symfony/symfony/security/advisories/GHSA-vqc8-7275-q272 | [email protected] | PatchVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-93 | Improper Neutralization of CRLF Sequences ('CRLF Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| sensiolabs symfony | < 5.4.52 >= 6.0.0, < 6.4.40 >= 7.0.0, < 7.4.12 >= 8.0.0, < 8.0.12 |
CPE
Remediation
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Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 16, 2026 | CVE Modified | CISA-ADP |
| Jul 15, 2026 | Initial Analysis | [email protected] |
| Jul 14, 2026 | New CVE Received | [email protected] |