Zend-Mail remote code execution in zend-mail via Sendmail adapter

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

8.8 · CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS

No dated EPSS signal available.

As published by the source; long descriptions are shortened.

When using the zend-mail component to send email via the Zend\Mail\Transport\Sendmail transport, a malicious user may be able to inject arbitrary parameters to the system sendmail program. The attack is performed by providing additional quote characters within an address; when unsanitized, they can be interpreted as additional command line arguments, leading to the vulnerability. The following example demonstrates injecting additional parameters to the sendmail binary via the From address: The attack works because zend-mail filters the email addresses using the RFC 3696 specification, where the string "AAA\" params injection"@domain is considered a valid address. This validation is provided using the zend-validator component with the following parameters: The above accepts local domain with any string specified by double quotes as the local part. While this is valid per RFC 3696, due to the fact that sender email addresses are provided to the sendmail binary via the command line,…

Published by the source

7 Jun 2024, 21:19 UTC

Last modified by the source

7 Jun 2024, 21:20 UTC

Source last checked

26 Oct 2026, 14:25 UTC

1. Revision 1 · created · 26 Oct 2026

   Published from ghsa record GHSA-cxf7-m5g2-v594

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# Patch Next advisory brief: GHSA-cxf7-m5g2-v594

Advisory: Zend-Mail remote code execution in zend-mail via Sendmail adapter
IDs: GHSA-cxf7-m5g2-v594
Record: https://patchnext.com/advisories/ghsa-cxf7-m5g2-v594 (revision 1, source checked 26 Oct 2026, 14:25 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 8.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: zendframework/zend-mail 2.7.2, 2.4.11. A vendor fix does not mean a deployment is fixed.

## Affected components
- Packagist zendframework/zend-mail: affected >= 2.0.0, < 2.4.11; >= 2.5.0, < 2.7.2; fixed in 2.7.2, 2.4.11

## Suggested inspection (read-only)
- Packagist zendframework/zend-mail: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on zendframework/zend-mail.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-cxf7-m5g2-v594 (GitHub-reviewed advisory GHSA-cxf7-m5g2-v594 lists affected ranges: Packagist zendframework/zend-mail >=2.0.0 =2.5.0 <2.7.2)

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