How severe is GHSA-v845-jxx5-vc9f?

GHSA-v845-jxx5-vc9f has a CVSS score of 5.9/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by GHSA-v845-jxx5-vc9f?

GHSA-v845-jxx5-vc9f affects the following packages: urllib3 (PyPI), urllib3 (PyPI). Ecosystems affected: PyPI.

How do I fix GHSA-v845-jxx5-vc9f?

Update urllib3 to version 2.0.6 or later. Run your dependency manager's update command and verify no transitive dependencies pin the vulnerable version. Use O3 Security's SCA scanner to confirm the fix is applied across your entire dependency tree.

Is GHSA-v845-jxx5-vc9f actively exploited in the wild?

No public exploit code has been indexed for GHSA-v845-jxx5-vc9f yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-v845-jxx5-vc9f?

GHSA-v845-jxx5-vc9f has an EPSS (Exploit Prediction Scoring System) score of 0.9%, placing it in the 77th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is GHSA-v845-jxx5-vc9f?

GHSA-v845-jxx5-vc9f is classified as Information Exposure (CWE-200). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was GHSA-v845-jxx5-vc9f published, and has it been updated?

GHSA-v845-jxx5-vc9f was published on October 2, 2023 and was last updated on February 4, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐍 PyPI

GHSA-v845-jxx5-vc9f

MEDIUM

`Cookie` HTTP header isn't stripped on cross-origin redirects

Also known asCVE-2023-43804PYSEC-2023-192

Published

Oct 2, 2023

Updated

Feb 4, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

EPSS Exploitation Probability

via FIRST.org ↗

0.9%probability of exploitation in next 30 days

Lower Risk77th percentile0.00%

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.

Blast Radius

2 pkgs affected

🐍urllib3🐍urllib3

Real-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

urllib3 doesn't treat the Cookie HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a Cookie header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly.

Users must handle redirects themselves instead of relying on urllib3's automatic redirects to achieve safe processing of the Cookie header, thus we decided to strip the header by default in order to further protect users who aren't using the correct approach.

Affected usages

We believe the number of usages affected by this advisory is low. It requires all of the following to be true to be exploited:

Using an affected version of urllib3 (patched in v1.26.17 and v2.0.6)
Using the Cookie header on requests, which is mostly typical for impersonating a browser.
Not disabling HTTP redirects
Either not using HTTPS or for the origin server to redirect to a malicious origin.

Remediation

Upgrading to at least urllib3 v1.26.17 or v2.0.6
Disabling HTTP redirects using redirects=False when sending requests.
Not using the Cookie header.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
🐍PyPI	`urllib3`	≥ 2.0.0&&< 2.0.6	2.0.6
🐍PyPI	`urllib3`	all versions	1.26.17

Frequently Asked Questions

urllib3 doesn't treat the `Cookie` HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a `Cookie` header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly. Users **must** handle redirects themselves instead of relying on urllib3's automatic redirects to achieve safe processing of the `Cookie` header, thus we decided to strip the header by default in order to further protect users who aren't using the correct appr

O3 Security · Impact-Aware SCA

Is GHSA-v845-jxx5-vc9f in your stack?

O3 detects GHSA-v845-jxx5-vc9f across PyPI dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works

CVSS Score

5.9/10

CVSS v3 base score

Vector breakdown

AV:Attack Vector

Network

AC:Attack Complexity

High

PR:Privileges Required

High

UI:User Interaction

None

S:Scope

Unchanged

C:Confidentiality

High

I:Integrity

High

A:Availability

None

Raw vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N

CWE Classification

CWE-200Information Exposure

Weaponization

No known public exploit tooling found.

OpenSSF Scorecard

Package health score

urllib3

8.6/10

Branch-Protection5/10

Code-Review8/10

Dependency-Update-Tool10/10

Maintained10/10

Vulnerabilities10/10

Assessed Jun 7, 2026

Timeline

Disclosed

Oct 2, 2023

Last updated

Feb 4, 2026

Identifiers

GHSA-v845-jxx5-vc9f

PYSEC-2023-192

References

Advisorynvd.nist.gov Webgithub.com Webgithub.com Webgithub.com Webgithub.com Weblists.debian.org Weblists.debian.org Weblists.fedoraproject.org Weblists.fedoraproject.org Weblists.fedoraproject.org Websecurity.netapp.com Webvicarius.io Packagegithub.com

Data from OSV.dev, enriched by O3 Security. Refreshed hourly.