CVE-2018-14774: Symfony Host Header Injection

high Affects symfony/symfony. Feed 2026.10.29.1, updated 2026-10-28; published ; advisory modified .

Symfony Host Header Injection

Package
symfony/symfony Composer
Affected versions
>=2.7.0 and <2.7.49 or >=2.8.0 and <2.8.44 or >=3.3.0 and <3.3.18 or >=3.4.0 and <3.4.14 or >=4.0.0 and <4.0.14 or >=4.1.0 and <4.1.3
Fixed in
2.7.49, 2.8.44, 3.3.18, 3.4.14, 4.0.14, 4.1.3
Severity
high  CVSS 7.2
Exploitation
not on CISA KEV · EPSS 1% (65.9th percentile)
Published
2022-05-14
Source
osv.dev

References

CWE-20
NVD recordsymfony/symfony advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# one-time install
pip install phpwarden

# then
phpwarden deps composer.lock

Or keep it checked automatically: GitHub Action · pre-commit hook · GitLab CI · Laravel artisan command

Install docs   How findings are ranked

Related advisories