GHSA-r64q-w8jr-g9qp — urllib3
MEDIUMGHSA-r64q-w8jr-g9qp is a medium-severity (CVSS 6.1) vulnerability in urllib3. 1 public exploit reference exists, so weaponization risk is real. A fix is available for urllib3 — see the affected versions and patch details below.
Improper Neutralization of CRLF Sequences in urllib3 library for Python
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.
How urgent is this, really
GHSA-r64q-w8jr-g9qp plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 378,567 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
urllib3Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects PyPI packages — download data is not available via public APIs for these ecosystems.
Description
In the urllib3 library through 1.24.2 for Python, CRLF injection is possible if the attacker controls the request parameter.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐍PyPI | urllib3 | all versions | 1.24.3pip install --upgrade 'urllib3==1.24.3' |
Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for urllib3, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update urllib3 to 1.24.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-r64q-w8jr-g9qp 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-r64q-w8jr-g9qp can be triaged on real exposure rather than presence alone.
Tailored to GHSA-r64q-w8jr-g9qp. 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.
This issue affects the version of python-urllib3 shipped with Red Hat Gluster Storage 3, as it is vulnerable to CRLF injection. Red Hat Satellite 6.2 is on Maintenance Support 2 phase, hence only selected critical and important issues will be fixed. Please refer to Red Hat Satellite Product Life Cycle page for more…
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Ansible Tower 3.5 for RHEL 7 | ansible-tower-35/ansible-tower:3.5.6-1 | RHBA-2020:1539 |
| Red Hat Ansible Tower 3.6 for RHEL 7 | ansible-tower-36/ansible-tower:3.6.4-1 | RHBA-2020:1540 |
| Red Hat Enterprise Linux 7 | python-urllib3-0:1.10.2-7.el7 | RHSA-2019:2272 |
| Red Hat Enterprise Linux 7 | python-pip-0:9.0.3-7.el7_7 | RHSA-2020:0850 |
| Red Hat Enterprise Linux 7 | python-virtualenv-0:15.1.0-4.el7_7 | RHSA-2020:0851 |
| Red Hat Enterprise Linux 7 | python-pip-0:9.0.3-7.el7_8 | RHSA-2020:2068 |
| Red Hat Enterprise Linux 7 | python-virtualenv-0:15.1.0-4.el7_8 | RHSA-2020:2081 |
| Red Hat Enterprise Linux 8 | python27:2.7-8010020190903182548.51c94b97 | RHSA-2019:3335 |
Frequently Asked Questions
Is GHSA-r64q-w8jr-g9qp in your dependencies?
O3 Security finds GHSA-r64q-w8jr-g9qp across PyPI dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.