CVE-2026-45070

MEDIUM

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

Title source: cna
STIX 2.1

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.

References (6)

Core 6

Scores

CVSS v3 6.5
EPSS 0.0029
EPSS Percentile 21.5%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable yes
Technical Impact partial

Details

CWE
CWE-93
Status published
Products (9)
sensiolabs/symfony < 5.4.52
symfony/mime < 5.4.52
symfony/mime >= 6.0.0-BETA1, < 6.4.40
symfony/mime >= 7.0.0-BETA1, < 7.4.12
symfony/mime >= 8.0.0-BETA1, < 8.0.12
symfony/symfony < 5.4.52
symfony/symfony >= 6.0.0-BETA1, < 6.4.40
symfony/symfony >= 7.0.0-BETA1, < 7.4.12
symfony/symfony >= 8.0.0-BETA1, < 8.0.12
Published Jul 14, 2026
Tracked Since Jul 15, 2026