phpwarden
FeaturesComparePricingAdvisoriesBlogDocsChangelogLog in
Log inStart free

CVE-2019-18889: Symfony Unsafe Cache Serialization Could Enable RCE

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

Symfony Unsafe Cache Serialization Could Enable RCE

Package
symfony/cache Composer
Affected versions
>=3.1.0 and <3.4.35 or >=4.0.0 and <4.2.12 or >=4.3.0 and <4.3.8 or >=3.1.0 and <3.2.0 or >=3.2.0 and <3.3.0 or >=3.3.0 and <3.4.0 or >=3.4.0 and <3.4.35 or >=4.0.0 and <4.1.0 or >=4.1.0 and <4.2.0 or >=4.2.0 and <4.2.12
Fixed in
3.4.35, 4.2.12, 4.3.8
Severity
critical  CVSS 9.8
Exploitation
not on CISA KEV · EPSS 33% (98.4th percentile)
Published
2019-12-02
Source
osv.dev

References

Symfony Unsafe Cache Serialization Could Enable RCE

Package
symfony/symfony Composer
Affected versions
>=3.1.0 and <3.4.35 or >=4.0.0 and <4.2.12 or >=4.3.0 and <4.3.8 or >=3.1.0 and <3.2.0 or >=3.2.0 and <3.3.0 or >=3.3.0 and <3.4.0 or >=3.4.0 and <3.4.35 or >=4.0.0 and <4.1.0 or >=4.1.0 and <4.2.0 or >=4.2.0 and <4.2.12
Fixed in
3.4.35, 4.2.12, 4.3.8
Severity
critical  CVSS 9.8
Exploitation
not on CISA KEV · EPSS 33% (98.4th percentile)
Published
2019-12-02
Source
osv.dev

References

CWE-94
NVD recordsymfony/cache advisoriessymfony/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