Arbitrary Argument Injection Affecting symfony/mailer 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-SYMFONYMAILER-16873898
- published24 May 2026
- disclosed20 May 2026
- creditClaude Mythos
Introduced: 20 May 2026
CVE-2026-45068 (opens in a new tab)How to fix?
Upgrade symfony/mailer to version 5.4.52, 6.4.40, 7.4.12, 8.0.12 or higher.
Overview
Affected versions of this package are vulnerable to Arbitrary Argument Injection via recipient handling in SendmailTransport when using sendmail -t mode. An attacker can inject arbitrary sendmail command-line options by supplying a recipient address beginning with -, as recipient addresses are appended to the sendmail command without a -- end-of-options separator.