urllib3 before 1.24.2 does not remove the authorization HTTP header when following a…
Priority LOW 28CWE-601Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Spoofing, Information disclosure
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Partial Red Hat: 1 fixed, 8 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-601 and CWE-200.
Summary
urllib3 before 1.24.2 does not remove the authorization HTTP header when following a cross-origin redirect (i.e., a redirect that differs in host, port, or scheme). This can allow for credentials in the authorization header to be exposed to unintended hosts or transmitted in cleartext. NOTE: this issue exists because of an incomplete fix for CVE-2018-20060 (which was case-sensitive).
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00589 48th percentileScored 2026-11-07
Fix Partial urllib3 (PyPI): 1.24.2Red Hat: 1 advisoryRed Hat: 1 fixed, 8 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | urllib3 (PyPI) | before 1.24.2 | 1.24.2 | Patch available | GHSA-gwvm-45gx-3cf8 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- urllib3 (PyPI) Vendor— Affected before 1.24.2 Fixed in 1.24.2 Patch available GHSA-gwvm-45gx-3cf8
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:* | before 1.24.2 | Vulnerable | python-pillow |
- cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:* Versions before 1.24.2 Vulnerable ·python-pillow
Remediation
- Fix · GHSA-gwvm-45gx-3cf8 urllib3 (PyPI) Fixed in 1.24.2 Advisory →
Red Hat 1 advisory
- RHSA-2024:2988 Released 2024-05-22 · Red Hat rating Moderatecontainer-tools:rhel8 security update
- Red Hat Enterprise Linux AppStream (v. 8) aardvark-dns-2:1.10.0-1.module+el8.10.0+21209+52deeb51.aarch64::container-tools:rhel8, aardvark-dns-2:1.10.0-1.module+el8.10.0+21209+52deeb51.ppc64le::container-tools:rhel8, aardvark-dns-2:1.10.0-1.module+el8.10.0+21209+52deeb51.s390x::container-tools:rhel8 +47
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Ansible Automation Platform 2 | Affected | No fix yet |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat OpenShift Container Platform 3.11 | Affected | No fix planned: Out of support scope |
| Red Hat OpenShift Container Platform 4 | Affected | No fix planned: Will not fix |
| Red Hat OpenShift Data Science (RHODS) | Affected | No fix yet |
| Red Hat Quay 3 | Affected | No fix yet |
| Red Hat Storage 3 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2024:2988 |
Not affected: 8 products
- Red Hat Certification for Red Hat Enterprise Linux 8
- Red Hat Developer Hub 1
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4
- Red Hat OpenStack Platform 17.1
- Red Hat Satellite 6
- Red Hat Software Collections
Timeline
- 2026-10-02 Threatist record created from CVE-2018-25091
- 2026-10-03 Alias added: GHSA-gwvm-45gx-3cf8
- 2026-10-27 Affected versions changed · Red Hat
References
Patch 3
More python-pillow Urllib3 vulnerabilities
- TI-2026-17326 urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API) CVSS 4.0HIGH 8.9
- TI-2018-14221 urllib3 before version 1.23 does not remove the Authorization HTTP header when following… CVSS 3.0CRITICAL 9.8
- TI-2025-40854 urllib3 allows an unbounded number of links in the decompression chain CVSS 4.0HIGH 8.9
- TI-2026-32373 urllib3: Decompression-bomb safeguards bypassed in parts of the streaming API CVSS 4.0HIGH 8.9
- TI-2025-40898 urllib3 Streaming API improperly handles highly compressed data CVSS 4.0HIGH 8.9
- TI-2021-12905 An issue was discovered in urllib3 before 1.26.5. CVSS 3.1HIGH 7.5
Sources
- CVE-2018-25091 · CVE Program
- CVE-2018-25091 · NVD
- FIRST EPSS
- GHSA-gwvm-45gx-3cf8 · GitHub Advisory Database · CC BY 4.0
- CVE-2018-25091 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences