GHSA-94g3-g5v7-q4jg — phpseclib/phpseclib
Fix: phpseclib/phpseclib@ccc21aeGHSA-94g3-g5v7-q4jg is a CWE-208 vulnerability in phpseclib/phpseclib. A fix is available for phpseclib/phpseclib — see the affected versions and patch details below.
phpseclib's AES-CBC unpadding susceptible to padding oracle timing attack
Exploitation Status
No confirmed exploitation observed yet
- CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.
Exploitation and automatability from CISA’s SSVC triage for GHSA-94g3-g5v7-q4jg.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
Real-World Exposure
phpseclib/phpseclib🐘phpseclib/phpseclib🐘phpseclib/phpseclibReal-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
Impact
Those using AES in CBC mode may be susceptible to a padding oracle timing attack.
Patches
https://github.com/phpseclib/phpseclib/commit/ccc21aef71eb170e9bf819b167e67d1fd9e6e788
Workarounds
Use AES in CTR, CFB or OFB modes
References
https://github.com/phpseclib/phpseclib/commit/ccc21aef71eb170e9bf819b167e67d1fd9e6e788
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | phpseclib/phpseclib | ≥ 3.0.0&&< 3.0.50 | 3.0.50composer require phpseclib/phpseclib:^3.0.50 |
| 🐘Packagist | phpseclib/phpseclib | ≥ 2.0.0&&< 2.0.52 | 2.0.52composer require phpseclib/phpseclib:^2.0.52 |
| 🐘Packagist | phpseclib/phpseclib | ≥ 0.1.1&&< 1.0.27 | 1.0.27composer require phpseclib/phpseclib:^1.0.27 |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for phpseclib/phpseclib, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update phpseclib/phpseclib to 3.0.50 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-94g3-g5v7-q4jg is resolved across your whole dependency graph.
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.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like GHSA-94g3-g5v7-q4jg can be triaged on real exposure rather than presence alone.
Tailored to GHSA-94g3-g5v7-q4jg. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Frequently Asked Questions
Is GHSA-94g3-g5v7-q4jg in your dependencies?
O3 Security finds GHSA-94g3-g5v7-q4jg across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.