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Fencer Vulns
high 7.5

CVE-2019-18888 json

Argument injection in a MimeTypeGuesser in Symfony

published 2019-11-21 6 y ago modified 2026-06-17 4 mo ago also GHSA-xhh6-956q-4q69 , EUVD-2019-0807

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

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).

Patch / fix

  • packagist symfony/http-foundation 2.8.52, 3.4.35, 4.2.12, 4.3.8
  • packagist symfony/mime 4.3.8
  • packagist symfony/symfony 2.8.52, 3.4.35, 4.2.12, 4.3.8
  • symfony Debian 14, Debian 13, Debian 12 4.3.8+dfsg-1

debian advisories DEBIAN-CVE-2019-18888

Exploit prediction

2.25% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:P/A:N
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected packages

ecosystem package affected fixed in
packagist 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
packagist symfony/mime
>=4.3.0, <4.3.8
4.3.8
packagist 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

Classification

Weakness
  • CWE-88 Improper Neutralization of Argument Delimiters in a Command
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.