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.

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-vqc8-7275-q272 Symfony has Email Header Injection via Non-Token Characters in Mime Parameter Names
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Mon, 27 Jul 2026 15:30:00 +0000

Type Values Removed Values Added
First Time appeared Symfony
Symfony mime
Symfony symfony
Vendors & Products Symfony
Symfony mime
Symfony symfony

Thu, 16 Jul 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 14 Jul 2026 18:45:00 +0000

Type Values Removed Values Added
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.
Title Symfony: Email Header Injection via Non-Token Characters in Mime Parameter Names
Weaknesses CWE-93
References
Metrics cvssV4_0

{'score': 6.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-16T14:31:20.673Z

Reserved: 2026-05-08T18:45:10.096Z

Link: CVE-2026-45070

cve-icon Vulnrichment

Updated: 2026-07-16T14:31:15.742Z

cve-icon NVD

Status : Analyzed

Published: 2026-07-14T19:17:06.147

Modified: 2026-07-16T15:16:31.487

Link: CVE-2026-45070

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-31T06:00:16Z

Weaknesses