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CRITICAL severity

Symfony Unsafe Cache Serialization Could Enable RCEGHSA-79gr-58r3-pwm3

CRITICAL

GHSA-79gr-58r3-pwm3 is a critical-severity (CVSS 9.8) Code Injection vulnerability in symfony/cache. EPSS puts its 30-day exploitation probability at 33.2% (98th percentile). A fix is available for symfony/cache — see the affected versions and patch details below.

Also known asCVE-2019-18889
Published
Updated
Affected
6 pkgs
Patched
6 / 6
Exploits
None indexed
Exploitation data as of Oct 8, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
33.2%probability of exploitation in next 30 days
Moderate Risk0.00%
Lower risk than most CVEs98th percentile — riskier than 98% of all scored CVEsHighest risk
0.00%14.2%28.3%42.5%2.6%33.2%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-79gr-58r3-pwm3 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 384,534 CVEs with a current EPSS score, this one falls in the 10–50% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

6 pkgs affected
🐘symfony/cache🐘symfony/cache🐘symfony/cache🐘symfony/symfony🐘symfony/symfony🐘symfony/symfony

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

An issue was discovered in Symfony 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. Serializing certain cache adapter interfaces could result in remote code injection. This is related to symfony/cache.

Affected Packages

6 total 6 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistsymfony/cache≥ 3.1.0&&< 3.4.353.4.35composer require symfony/cache:^3.4.35
🐘Packagistsymfony/cache≥ 4.0.0&&< 4.2.124.2.12composer require symfony/cache:^4.2.12
🐘Packagistsymfony/cache≥ 4.3.0&&< 4.3.84.3.8composer require symfony/cache:^4.3.8
🐘Packagistsymfony/symfony≥ 3.1.0&&< 3.4.353.4.35composer require symfony/symfony:^3.4.35
🐘Packagistsymfony/symfony≥ 4.0.0&&< 4.2.124.2.12composer require symfony/symfony:^4.2.12
🐘Packagistsymfony/symfony≥ 4.3.0&&< 4.3.84.3.8composer require symfony/symfony:^4.3.8

Affected Products

2 products · 4 configurations
OS
fedorafedoraproject
1 version
31
Application
symfonysensiolabs
≥ 4.3.0 && ≤ 4.3.7
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for symfony/cache, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update symfony/cache to 3.4.35 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-79gr-58r3-pwm3 is resolved across your whole dependency graph.

  3. Workarounds

    Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

An issue was discovered in Symfony 3.4.0 through 3.4.34, 4.2.0 through 4.2.11, and 4.3.0 through 4.3.7. Serializing certain cache adapter interfaces could result in remote code injection. This is related to symfony/cache.
O3 Security · Impact-Aware SCA

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Symfony Unsafe Cache Serialization Could Enable RCE