HOMEVULNERABILITIESCVE-2019-18888
HIGH

CVE-2019-18888

CWE-88Published: November 21, 2019· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

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).

NVD Source

Technical Analysis

CVE-2019-18888 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

Fedora1 product(s)
fedora
sensiolabs1 product(s)
symfony
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://symfony.com/blog/cve-2019-18888-prevent-argument-injection-in-a-mimetypeguesser
ADVISORYhttps://symfony.com/blog/cve-2019-18888-prevent-argument-injection-in-a-mimetypeguesser

All References (12)

→
https://github.com/symfony/symfony/releases/tag/v4.3.8Release Notes
→
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://symfony.com/blog/cve-2019-18888-prevent-argument-injection-in-a-mimetypeguesserVendor Advisory
→
https://symfony.com/blog/symfony-4-3-8-releasedRelease Notes
→
https://github.com/symfony/symfony/releases/tag/v4.3.8Release Notes
→
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://symfony.com/blog/cve-2019-18888-prevent-argument-injection-in-a-mimetypeguesserVendor Advisory
→
https://symfony.com/blog/symfony-4-3-8-releasedRelease Notes

Quick Facts

CVE IDCVE-2019-18888
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-88
CISA KEVNo
Affected2 vendor(s)
PublishedNov 21, 2019

Related CVEs (CWE-88)

CVE-2026-57572
10.0
CVE-1999-0113
10.0
CVE-2004-0480
10.0
CVE-2007-0882
10.0
CVE-2026-47365
9.9
CVE-2018-3856
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-18888 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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