CVE-2018-20060

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 29% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 4%CVSS: 9.8Exploit: NoneExposed: 0

A fix is available — apply it.

urllib3 before version 1.23 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.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
90.3%
KEV
Not listed

Published

December 11, 2018

Last Modified

December 27, 2024

Advisory Details (9)

Auto-updated Jun 8, 2026
Patch available. Sources: redhat, github_pr.
generic

[SECURITY] Fedora 30 Update: python-urllib3-1.24.2-1.fc30 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XWP36YW3KSVLXDBY3QJKDYEPCIMN3VQZ/
generic

[SECURITY] Fedora 28 Update: python-urllib3-1.24.2-1.fc28 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BXLAXHM3Z6DUCXZ7ZXZ2EAYJXWDCZFCT/
generic

[SECURITY] Fedora 29 Update: python-urllib3-1.24.2-1.fc29 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5SJERZEJDSUYQP7BNBXMBHRHGY26HRZD/
generic Patch Available

[SECURITY] [DLA 2686-1] python-urllib3 security update

https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html
github_pr Patch Available

Remove Authorization header when redirecting cross-host

Patch available: urllib3/urllib3 2.0.0a3 (PR #1346 merged 2018-03-29)

https://github.com/urllib3/urllib3/pull/1346
generic

Auth header remains during redirects · Issue #1316 · urllib3/urllib3 · GitHub

https://github.com/urllib3/urllib3/issues/1316
generic

urllib3/CHANGES.rst at main · urllib3/urllib3 · GitHub

https://github.com/urllib3/urllib3/blob/master/CHANGES.rst
redhat Patch Available

1649153 – (CVE-2018-20060) CVE-2018-20060 python-urllib3: Cross-host redirect does not remove Authorization header allow for credential exposure

Affected: Red Hat Enterprise Linux 7

https://bugzilla.redhat.com/show_bug.cgi?id=1649153
redhat Patch Available

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2019:2272

Vendor Advisories for CVE-2018-20060(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(10)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3-urllib3 (1.13.1-2ubuntu0.16.04.3) @ xenial2026-05-28ubuntu
redhatpython-pip-0:9.0.3-7.el7_82020-05-12redhat
redhatpython-virtualenv-0:15.1.0-4.el7_82020-05-12redhat
redhatpython27:2.7-8020020200117110429.90f98d4f2020-04-28redhat
redhatpython-pip-0:9.0.3-16.el82020-04-28redhat
redhatansible-tower-35/ansible-tower:3.5.6-12020-04-22redhat
redhatansible-tower-36/ansible-tower:3.6.4-12020-04-22redhat
redhatpython-virtualenv-0:15.1.0-4.el7_72020-03-17redhat
redhatpython-pip-0:9.0.3-7.el7_72020-03-17redhat
redhatpython-urllib3-0:1.10.2-7.el72019-08-06redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
PyPI(1)
PackageVulnerable rangeFixed inDependents
urllib30.2 ... 1.9.1 (45 versions)1.23—

Additional Vendor Advisories

(7)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 14× in last 7d / 51× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 13:42 UTCEPSS rescore
  2. 2026-07-07 13:42 UTCEPSS rescore
  3. 2026-07-06 16:24 UTCEPSS rescore
  4. 2026-07-06 16:24 UTCEPSS rescore
  5. 2026-07-06 02:20 UTCEPSS rescore
  6. 2026-07-05 02:27 UTCEPSS rescore
  7. 2026-07-04 06:28 UTCEPSS rescore
  8. 2026-07-04 06:28 UTCEPSS rescore
  9. 2026-07-03 20:56 UTCOSV refresh
  10. 2026-07-02 16:54 UTCEPSS rescore
  11. 2026-07-01 15:03 UTCEPSS rescore
  12. 2026-07-01 15:03 UTCEPSS rescore
  13. 2026-06-30 23:20 UTCEPSS rescore
  14. 2026-06-30 23:19 UTCEPSS rescore
  15. 2026-06-29 14:03 UTCEPSS rescore
  16. 2026-06-28 04:53 UTCEPSS rescore
  17. 2026-06-28 04:53 UTCEPSS rescore
  18. 2026-06-27 03:06 UTCEPSS rescore
  19. 2026-06-27 03:06 UTCEPSS rescore
  20. 2026-06-25 13:47 UTCEPSS rescore
  21. 2026-06-25 13:47 UTCEPSS rescore
  22. 2026-06-24 14:02 UTCEPSS rescore
  23. 2026-06-24 14:02 UTCEPSS rescore
  24. 2026-06-23 21:30 UTCEPSS rescore
  25. 2026-06-23 21:30 UTCEPSS rescore
Show 54 more
  1. 2026-06-23 21:30 UTCEPSS rescore
  2. 2026-06-22 14:23 UTCEPSS rescore
  3. 2026-06-21 14:54 UTCEPSS rescore
  4. 2026-06-21 14:54 UTCEPSS rescore
  5. 2026-06-21 01:57 UTCEPSS rescore
  6. 2026-06-21 01:57 UTCEPSS rescore
  7. 2026-06-19 19:23 UTCEPSS rescore
  8. 2026-06-19 19:23 UTCEPSS rescore
  9. 2026-06-18 17:50 UTCEPSS rescore
  10. 2026-06-18 17:50 UTCEPSS rescore
  11. 2026-06-17 17:50 UTCEPSS rescore
  12. 2026-06-17 17:50 UTCEPSS rescore
  13. 2026-06-16 17:50 UTCEPSS rescore
  14. 2026-06-16 17:50 UTCEPSS rescore
  15. 2026-06-15 17:45 UTCEPSS rescore
  16. 2026-06-15 09:13 UTCOSV refresh
  17. 2026-06-14 23:15 UTCEPSS rescore
  18. 2026-06-14 23:14 UTCEPSS rescore
  19. 2026-06-13 22:58 UTCEPSS rescore
  20. 2026-06-12 23:09 UTCEPSS rescore
  21. 2026-06-12 23:09 UTCEPSS rescore
  22. 2026-06-11 13:57 UTCEPSS rescore
  23. 2026-06-10 22:16 UTCEPSS rescore
  24. 2026-06-10 13:19 UTCEPSS rescore
  25. 2026-06-08 14:14 UTCEPSS rescore
  26. 2026-06-08 14:14 UTCEPSS rescore
  27. 2026-06-07 15:22 UTCEPSS rescore
  28. 2026-06-07 15:22 UTCEPSS rescore
  29. 2026-06-06 13:45 UTCEPSS rescore
  30. 2026-06-06 13:45 UTCEPSS rescore
  31. 2026-06-05 22:45 UTCEPSS rescore
  32. 2026-06-05 22:45 UTCEPSS rescore
  33. 2026-06-05 06:08 UTCEPSS rescore
  34. 2026-06-05 06:08 UTCEPSS rescore
  35. 2026-06-04 13:10 UTCEPSS rescore
  36. 2026-06-02 20:11 UTCEPSS rescore
  37. 2026-06-02 20:11 UTCEPSS rescore
  38. 2026-06-01 13:50 UTCEPSS rescore
  39. 2026-06-01 13:50 UTCEPSS rescore
  40. 2026-05-31 22:29 UTCEPSS rescore
  41. 2026-05-31 00:14 UTCEPSS rescore
  42. 2026-05-31 00:14 UTCEPSS rescore
  43. 2026-05-29 13:41 UTCEPSS rescore
  44. 2026-05-28 13:42 UTCEPSS rescore
  45. 2026-05-28 13:42 UTCEPSS rescore
  46. 2026-05-28 00:25 UTCEG score recompute
  47. 2026-05-28 00:25 UTCVendor advisory
  48. 2026-05-27 13:38 UTCEPSS rescore
  49. 2026-05-27 13:38 UTCEPSS rescore
  50. 2026-05-26 13:42 UTCEPSS rescore
  51. 2026-05-26 13:42 UTCEPSS rescore
  52. 2026-05-26 07:17 UTCEPSS rescore
  53. 2026-05-26 07:17 UTCEPSS rescore
  54. 2026-05-23 05:48 UTCOSV refresh

Frequently asked(5)

What is CVE-2018-20060?
CVE-2018-20060 is a critical vulnerability published on December 11, 2018. urllib3 before version 1.23 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.
When was CVE-2018-20060 disclosed?
CVE-2018-20060 was first published in the National Vulnerability Database on December 11, 2018, with the most recent update on December 27, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-20060 actively exploited?
CVE-2018-20060 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 90.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2018-20060?
CVE-2018-20060 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2018-20060?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-20060, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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