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Not in CISA KEV
HIGH severity

GHSA-vf4w-fg7r-5v94

HIGHFix: phpseclib/phpseclib#1635

GHSA-vf4w-fg7r-5v94 is a high-severity (CVSS 7.5) CWE-347 vulnerability in phpseclib/phpseclib. O3 Security confirms whether GHSA-vf4w-fg7r-5v94 is actually reachable in your code before you act, and blocks exploitation at runtime until you patch.

Improper Certificate Validation in phpseclib

Also known asCVE-2021-30130
Published
Apr 7, 2021
Updated
Feb 16, 2024
Affected
2 pkgs
Patched
2 / 2
Exploits
None indexed
Exploitation data as of Feb 16, 2024 · OSV.dev, NVD, FIRST.org (EPSS)

Real-World Exposure

2 pkgs affected
🐘phpseclib/phpseclib🐘phpseclib/phpseclib

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

phpseclib before 2.0.31 and 3.x before 3.0.7 mishandles RSA PKCS#1 v1.5 signature verification.

Affected Packages

2 total 2 fixed
EcosystemPackageVulnerable rangeFix
🐘Packagistphpseclib/phpseclib3.0.0&&< 3.0.73.0.7
🐘Packagistphpseclib/phpsecliball versions2.0.31

Detection & mitigation playbook

Open-source dependency
  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for phpseclib/phpseclib. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

  2. Fix

    Update phpseclib/phpseclib to 3.0.7 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-vf4w-fg7r-5v94 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

  4. How O3 protects you

    O3 pinpoints whether GHSA-vf4w-fg7r-5v94 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to GHSA-vf4w-fg7r-5v94. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

phpseclib before 2.0.31 and 3.x before 3.0.7 mishandles RSA PKCS#1 v1.5 signature verification.
O3 Security · Impact-Aware SCA

Is GHSA-vf4w-fg7r-5v94 in your dependencies?

O3 detects GHSA-vf4w-fg7r-5v94 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.