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CVE-2026-45070

Symfony: Email Header Injection via Non-Token Characters in Mime Parameter Names

Published: Jul 14, 2026Updated: Jul 16, 2026 Sources: CVE List NVDCWE-93
6.5MEDIUM
NVD MITRE
EPSS Score
0.3%
Top 78.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-93

Affected Products

symfony
oss-projectaka symfony framework, twig (related)
symfonyLibrary
OSS Libraries / web-framework
mimeLibrary
OSS Libraries / web-framework
sensiolabs
oss-project
symfonyLibraryLibrary
OSS Libraries / generic-library

Exploitability

Official Patch Available
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References

https://github.com/symfony/symfony/security/advisories/GHSA-vqc8-7275-q272
github.com
https://github.com/symfony/symfony/commit/e62ea217f8b4ca8ae922ad0f949e0c4dc1f9b613
github.com
https://github.com/symfony/symfony/releases/tag/v5.4.52
github.com
and 3 more references View all →

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