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CVE-2026-45068 — Symfony has an Argument Injection in...

MEDIUM

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

Published May 27, 2026Updated September 10, 2026Source: osv

Summary

### Description 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. ### Resolution The `SendmailTransport` transport now ensure `--` is set before the list of recipients. The patch for this issue is available [here](https://github.com/symfony/symfony/commit/c45144862dc289d03952f41f6078174089a3afc6) for branch 5.4. ### Credits Symfony would like to thank Claude Mythos Preview (via Project Glasswing) for reporting the issue and providing the fix.

Advisory Timeline

  • First published May 27, 2026 (138 days ago).
  • Last revised September 10, 2026 — 105 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

Composer
Update symfony/symfony to 7.4.12 or later
composer require "symfony/symfony:^7.4.12"
Composer
Update symfony/symfony to 6.4.40 or later
composer require "symfony/symfony:^6.4.40"
Composer
Update symfony/mailer to 8.0.12 or later
composer require "symfony/mailer:^8.0.12"
Composer
Update symfony/symfony to 8.0.12 or later
composer require "symfony/symfony:^8.0.12"
Composer
Update symfony/mailer to 7.4.12 or later
composer require "symfony/mailer:^7.4.12"
Composer
Update symfony/mailer to 5.4.52 or later
composer require "symfony/mailer:^5.4.52"
Composer
Update symfony/mailer to 6.4.40 or later
composer require "symfony/mailer:^6.4.40"
Composer
Update symfony/symfony to 5.4.52 or later
composer require "symfony/symfony:^5.4.52"

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (8)

Affects 1 ecosystem: packagist (2).

PackageEcosystemAffectedFixed In
symfony/symfony
packagist
v7.0.0, v7.0.1, v7.0.10, v7.0.2 (+66 more)7.4.12
symfony/symfony
packagist
v6.0.0, v6.0.1, v6.0.10, v6.0.11 (+116 more)6.4.40
symfony/mailer
packagist
v8.0.0, v8.0.3, v8.0.4, v8.0.6 (+1 more)8.0.12
symfony/symfony
packagist
v8.0.0, v8.0.1, v8.0.10, v8.0.11 (+8 more)8.0.12
symfony/mailer
packagist
v7.0.0, v7.0.2, v7.0.3, v7.0.4 (+36 more)7.4.12
symfony/mailer
packagist
v4.3.0, v4.3.0-BETA1, v4.3.0-BETA2, v4.3.0-RC1 (+135 more)5.4.52
symfony/mailer
packagist
v6.0.0, v6.0.1, v6.0.10, v6.0.11 (+64 more)6.4.40
symfony/symfony
packagist
2.0.4, 2.0.5, 2.0.6, 2.0.7 (+627 more)5.4.52

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 8.1 score means for each attack dimension.

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
—
Confidentiality
—
Integrity
—
Availability
—

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U

References

Frequently Asked Questions

What is CVE-2026-45068?
Symfony has an Argument Injection in SendmailTransport via Dash-Prefixed Recipient Address This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 8.1/10).
How do I check if my project is affected by CVE-2026-45068?
CVE-2026-45068 affects symfony/symfony and symfony/mailer. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-45068 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score
8.1

High exploitability or significant impact. Prioritize remediation within days.

Also Known As

GHSA-xx3c-qf5g-hc39

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