CVE-2026-45068 Symfony: Argument Injection in SendmailTransport via Dash-Prefixed Recipient Address

What is CVE-2026-45068?

CVE-2026-45068 is a high-severity command injection vulnerability in Sensiolabs Symfony, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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, SendmailTransport in -t mode appended recipient addresses to the sendmail command line without a -- end-of-options separator, allowing an address beginning with - to be interpreted as a sendmail command-line option instead of an address. This issue is fixed in versions 5.4.52, 6.4.40, 7.4.12, and 8.0.12.

Weakness: CWE-88

Which versions are affected by CVE-2026-45068?

16 open source packages ship an affected version, including symfony/mailer and symfony/symfony. It affects 1 product.

Products include Sensiolabs Symfony.

How do I fix CVE-2026-45068?

Upgrade symfony/mailer to a fixed version for your release line: 5.4.52, 6.4.40, 7.4.12 or 8.0.12.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2026-45068 being exploited?

There is no known exploitation of CVE-2026-45068 in the wild and no public exploit code.

Other vulnerabilities in Sensiolabs Symfony

• CVE-2019-11325 Improper Input Validation in Symfony Critical 9.8
• CVE-2017-11365 Symfony Incorrect Access Control Critical 9.8
• CVE-2019-10913 Invalid HTTP method overrides allow possible XSS or other attacks in Symfony Critical 9.8
• CVE-2018-11407 Symfony Authentication Bypass Critical 9.8
• CVE-2016-2403 Symfony Authentication Bypass Critical 9.8

All Sensiolabs Symfony vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLSA-2026-1782867601, CLSA-2026-1783645408, DEBIAN-CVE-2026-45068, GHSA-xx3c-qf5g-hc39, UBUNTU-CVE-2026-45068.