Argument injection in a MimeTypeGuesser in Symfony
An issue was discovered in Symfony 2.8.0 through 2.8.50, 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. If an application passes unvalidated user input as the file for which MIME type validation should occur, then arbitrary arguments are passed to the underlying file command. This is related to symfony/http-foundation (and symfony/mime in 4.3.x).
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Composer package | symfony/http-foundation | >= 2.0.0, < 2.8.52, >= 3.0.0, < 3.4.35, >= 4.0.0, < 4.2.12, >= 4.3.0, < 4.3.8 | 2.8.52, 3.4.35, 4.2.12, 4.3.8 |
| Composer package | symfony/mime | >= 4.3.0, < 4.3.8 | 4.3.8 |
| Composer package | symfony/symfony | >= 2.0.0, < 2.8.52, >= 3.0.0, < 3.4.35, >= 4.0.0, < 4.2.12, >= 4.3.0, < 4.3.8 | 2.8.52, 3.4.35, 4.2.12, 4.3.8 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2019-18888
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2019-18888.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/mime/CVE-2019-18888.yaml
- https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2019-18888.yaml
- https://github.com/symfony/symfony/releases/tag/v4.3.8
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DZNXRVHDQBNZQUCNRVZICPPBFRAUWUJX
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UED22BOXTL2SSFMGYKA64ZFHGLLJG3EA
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/VXEAOEANNIVYANTMOJ42NKSU6BGNBULZ
- https://symfony.com/blog/cve-2019-18888-prevent-argument-injection-in-a-mimetypeguesser
- https://symfony.com/blog/symfony-4-3-8-released
- https://symfony.com/cve-2019-18888
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N- Weakness (CWE)
CWE-20, CWE-88- Platform
- Composer
- Package
symfony/http-foundation, symfony/mime, symfony/symfony- Disclosed
- 02.12.2019
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-xhh6-956q-4q69 - CC BY 4.0
Vulnerability history: symfony/http-foundation
All published vulnerabilities of this package (Composer package), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 14
- First → latest
- 12.2019 06.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 1
- High 3
- Medium 8
- Low 2
Disclosures per year
- 2019: 2
- 2020: 1
- 2021: 0
- 2022: 4
- 2023: 0
- 2024: 5
- 2025: 1
- 2026: 1
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