GHSA-qccp-gfcp-xxvc

Source

https://github.com/advisories/GHSA-qccp-gfcp-xxvc

Import Source

https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-qccp-gfcp-xxvc/GHSA-qccp-gfcp-xxvc.json

JSON Data

https://api.osv.dev/v1/vulns/GHSA-qccp-gfcp-xxvc

Aliases

CVE-2026-44431

Published

2026-05-11T14:51:20Z

Modified

2026-05-11T15:03:47.965992Z

Severity

8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator

Summary

urllib3: Sensitive headers forwarded across origins in proxied low-level redirects

Details

Impact

When following cross-origin redirects for requests made using urllib3’s high-level APIs, such as urllib3.request(), PoolManager.request(), and ProxyManager.request(), sensitive headers — Authorization, Cookie, and Proxy-Authorization (defined in Retry.DEFAULT_REMOVE_HEADERS_ON_REDIRECT) — are stripped by default, as expected.

However, cross-origin redirects followed from the low-level API via ProxyManager.connection_from_url().urlopen(..., assert_same_host=False) still forward these sensitive headers.

Affected usage

Applications and libraries using urllib3 versions earlier than 2.7.0 may be affected if they allow cross-origin redirects while making requests through HTTPConnection.urlopen() instances created via ProxyManager.connection_from_url().

Remediation

Upgrade to urllib3 version 2.7.0 or later, in which sensitive headers are stripped from redirects followed by HTTPConnection.

If upgrading is not immediately possible, avoid using this low-level redirect flow for cross-origin redirects. If appropriate for your use case, switch to ProxyManager.request().

Database specific

{
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-11T14:51:20Z",
    "cwe_ids": [
        "CWE-200"
    ],
    "severity": "HIGH",
    "nvd_published_at": null
}

References

Affected packages

PyPI / urllib3

Package

Name: urllib3; View open source insights on deps.dev
Purl: pkg:pypi/urllib3

Affected ranges

Type: ECOSYSTEM
Events: Introduced

1.23

Fixed

2.7.0

Affected versions

1.*

1.23

1.24

1.24.1

1.24.2

1.24.3

1.25

1.25.1

1.25.2

1.25.3

1.25.4

1.25.5

1.25.6

1.25.7

1.25.8

1.25.9

1.25.10

1.25.11

1.26.0

1.26.1

1.26.2

1.26.3

1.26.4

1.26.5

1.26.6

1.26.7

1.26.8

1.26.9

1.26.10

1.26.11

1.26.12

1.26.13

1.26.14

1.26.15

1.26.16

1.26.17

1.26.18

1.26.19

1.26.20

2.*

2.0.0a1

2.0.0a2

2.0.0a3

2.0.0a4

2.0.0

2.0.1

2.0.2

2.0.3

2.0.4

2.0.5

2.0.6

2.0.7

2.1.0

2.2.0

2.2.1

2.2.2

2.2.3

2.3.0

2.4.0

2.5.0

2.6.0

2.6.1

2.6.2

2.6.3

Database specific

source

"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-qccp-gfcp-xxvc/GHSA-qccp-gfcp-xxvc.json"