CRLF Injection Affecting symfony/mime package, versions <5.4.52>=6.0.0-BETA1, <6.4.40>=7.0.0-BETA1, <7.4.12>=8.0.0-BETA1, <8.0.12
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PHP-SYMFONYMIME-16797270
- published22 May 2026
- disclosed20 May 2026
- creditFabian Fleischer
Introduced: 20 May 2026
CVE-2026-45070 (opens in a new tab)How to fix?
Upgrade symfony/mime to version 5.4.52, 6.4.40, 7.4.12, 8.0.12 or higher.
Overview
symfony/mime is a library to manipulate MIME messages.
Affected versions of this package are vulnerable to CRLF Injection via Non-Token Characters in Mime Parameter Names. A caller that derives a parameter name from untrusted input, e.g. an application that lets a user influence a Content-Disposition parameter name, can include \r\n or other non-token bytes inside the name, terminating the current header and injecting additional headers in the rendered message.