Cloudanix VulnDB

CVE-2026-45068

High · 8.1

Symfony has an Argument Injection in SendmailTransport via Dash-Prefixed Recipient Address

CVSS

8.1

EPSS

0.5%

Published

May 27, 2026

CISA due date

—

The record

Symfony Mailer selects a transport via the `MAILER_DSN` environment variable / configuration (e.g. `smtp://...`, `sendmail://...`, `native://default`). `SendmailTransport` invokes the local `sendmail` binary and supports two modes: `-bs` (speak SMTP over stdin: the default) and `-t` (read the message on stdin, pass recipients as command-line arguments). In `-t` mode, recipient addresses are appended to the sendmail command line **without a `--` end-of-options separator**. A recipient address beginning with `-` (which `Symfony\Component\Mime\Address` accepts as valid) is therefore interpreted by sendmail as a command-line option rather than an address.

Affected packages

Ecosystem Package Introduced Fixed

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