CVE-2023-43804

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.1 under NVD CVSS v3. EPSS exploit probability: 1.2%, top 35% 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
8.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.1Exploit: None knownExposed: 0

A fix is available — apply it.

urllib3 is a user-friendly HTTP client library for Python. 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. This issue has been patched in urllib3 version 1.26.17 or 2.0.5.

CVSS v3
8.1
EG Score
8.1(medium)
EG Risk
41(Track)
EG Risk 41/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity81% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
67%
KEV
Not listed

Published

October 4, 2023

Last Modified

June 17, 2026

Advisory Details (7)

Auto-updated Sep 13, 2026
Patch available. Sources: github_commit, github.
github Patch Available

Cookie request header isn't stripped during cross-origin redirects · Advisory · urllib3/urllib3 · GitHub

Affected: v1.26.17 and v2.0.6)

https://github.com/urllib3/urllib3/security/advisories/GHSA-v845-jxx5-vc9f
github_commit Patch Available

commit 644124ecd0b6 (urllib3/urllib3)

Patch available: urllib3/urllib3 2.0.6 (contains commit 644124ecd0b6)

https://github.com/urllib3/urllib3/commit/644124ecd0b6e417c527191f866daa05a5a2056d
github_commit Patch Available

commit 01220354d389 (urllib3/urllib3)

Patch available: urllib3/urllib3 1.26.17 (contains commit 01220354d389)

https://github.com/urllib3/urllib3/commit/01220354d389cd05474713f8c982d05c9b17aafb
generic

[SECURITY] Fedora 37 Update: python-urllib3-1.26.17-1.fc37 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/[email protected]/message/NDAGZXYJ7H2G3SB47M453VQVNAWKAEJJ/
generic

[SECURITY] Fedora 38 Update: python-urllib3-1.26.17-1.fc38 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/[email protected]/message/I3PR7C6RJ6JUBQKIJ644DMIJSUP36VDY/
generic

[SECURITY] Fedora 39 Update: python-urllib3-1.26.18-1.fc39 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/[email protected]/message/5F5CUBAN5XMEBVBZPHFITBLMJV5FIJJ5/
generic Patch Available

[SECURITY] [DLA 3610-1] python-urllib3 security update

https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html

Vendor Advisories for CVE-2023-43804(13)

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

Patch Availability(24)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntupython3-pip (8.1.1-2ubuntu0.6+esm6) @ xenial2026-05-24ubuntu
ubuntupython3-urllib3 (1.26.16-1ubuntu0.1) @ mantic2026-05-24ubuntu
redhatpython39-devel:3.9-8100020240214182535.7044f6c12024-05-22redhat
redhatpython27:2.7-8100020240208011952.5f0f67de2024-05-22redhat
redhatpython3.11-urllib3-0:1.26.12-2.el82024-05-22redhat
redhatpython3.11-urllib3-0:1.26.12-2.el92024-04-30redhat
redhatodf4/rook-ceph-rhel9-operator:v4.15.0-1032024-03-19redhat
redhatautomation-controller-0:4.5.1-1.el9ap2024-02-07redhat
redhatpython-urllib3-0:1.24.2-5.el8_8.12024-01-30redhat
redhatpython-urllib3-0:1.26.5-3.el9_3.12024-01-25redhat
redhatpython-urllib3-0:1.24.2-5.el8_6.12024-01-18redhat
redhatpython-urllib3-0:1.25.10-5.el8ost2024-01-16redhat
redhatfence-agents-0:4.2.1-121.el8_9.22024-01-10redhat
redhatpython-urllib3-0:1.24.2-5.el8_9.22024-01-10redhat
redhatsatellite-convert2rhel-toolkit-0:1.0.0-1.el8sat2023-12-14redhat
redhatfence-agents-0:4.10.0-55.el9_3.22023-12-12redhat
redhatfence-agents-0:4.2.1-65.el8_4.132023-11-28redhat
redhatfence-agents-0:4.2.1-112.el8_8.22023-11-28redhat
redhatfence-agents-0:4.10.0-20.el9_0.102023-11-21redhat
redhatfence-agents-0:4.2.1-89.el8_6.102023-11-21redhat
redhatfence-agents-0:4.10.0-43.el9_2.22023-11-21redhat
redhatfence-agents-0:4.2.1-41.el8_2.122023-11-21redhat
redhatfence-agents-0:4.2.1-30.el8_1.102023-11-08redhat
redhatpython-urllib3-0:1.26.18-1.el9ap2023-10-30redhat

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

(16 across 16 ecosystems)
Alpine:v3.15(1)
PackageVulnerable rangeFixed inDependents
py3-urllib3—1.26.17-r0—
Alpine:v3.16(1)
PackageVulnerable rangeFixed inDependents
py3-urllib3—1.26.17-r0—
Alpine:v3.17(1)
PackageVulnerable rangeFixed inDependents
py3-urllib3—1.26.17-r0—
Alpine:v3.18(1)
PackageVulnerable rangeFixed inDependents
py3-urllib3—1.26.17-r0—
Alpine:v3.19(1)
PackageVulnerable rangeFixed inDependents
py3-urllib3—1.26.17-r0—
Alpine:v3.20(1)
PackageVulnerable rangeFixed inDependents
py3-urllib3—1.26.17-r0—
Alpine:v3.21(1)
PackageVulnerable rangeFixed inDependents
py3-urllib3—1.26.17-r0—
Alpine:v3.22(1)
PackageVulnerable rangeFixed inDependents
py3-urllib3—1.26.17-r0—
Alpine:v3.23(1)
PackageVulnerable rangeFixed inDependents
py3-urllib3—1.26.17-r0—
Alpine:v3.24(1)
PackageVulnerable rangeFixed inDependents
py3-urllib3—1.26.17-r0—
Debian:10(1)
PackageVulnerable rangeFixed inDependents
python-urllib31.24.1-11.24.1-1+deb10u1—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
python-urllib31.26.5-1~exp11.26.5-1~exp1+deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
python-urllib31.26.12-11.26.12-1+deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
python-urllib3—1.26.17-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
python-urllib3—1.26.17-1—
PyPI(1)
PackageVulnerable rangeFixed inDependents
urllib30.2 ... 2.0.5 (85 versions)1.26.17—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(13)

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 7× in last 7d / 29× 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.

Showing the most recent 100 of 174 total refreshes for this CVE.

  1. 2026-09-18 19:25 UTCEPSS rescore
  2. 2026-09-17 19:25 UTCEPSS rescore
  3. 2026-09-16 14:06 UTCEPSS rescore
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  17. 2026-09-03 16:46 UTCOSV refresh
  18. 2026-09-02 14:09 UTCEPSS rescore
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  20. 2026-08-30 19:15 UTCEPSS rescore
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  24. 2026-08-26 14:44 UTCEPSS rescore
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  1. 2026-08-25 13:46 UTCEPSS rescore
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  7. 2026-08-18 13:46 UTCEPSS rescore
  8. 2026-08-17 13:45 UTCEPSS rescore
  9. 2026-08-17 05:57 UTCOSV refresh
  10. 2026-08-16 14:54 UTCEPSS rescore
  11. 2026-08-16 02:12 UTCEPSS rescore
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  26. 2026-08-02 02:25 UTCEPSS rescore
  27. 2026-08-02 02:25 UTCEPSS rescore
  28. 2026-08-02 00:36 UTCOSV refresh
  29. 2026-08-01 04:14 UTCEPSS rescore
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  40. 2026-07-23 14:16 UTCEPSS rescore
  41. 2026-07-23 14:16 UTCEPSS rescore
  42. 2026-07-23 02:26 UTCEG score recompute
  43. 2026-07-22 23:13 UTCEG score recompute▲ 2.20
  44. 2026-07-22 14:06 UTCEPSS rescore
  45. 2026-07-21 15:23 UTCEPSS rescore
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  48. 2026-07-19 14:29 UTCEPSS rescore
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  50. 2026-07-18 10:03 UTCEPSS rescore
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  56. 2026-07-15 07:49 UTCOSV refresh
  57. 2026-07-15 01:58 UTCEPSS rescore
  58. 2026-07-13 22:28 UTCEPSS rescore
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  67. 2026-07-06 16:26 UTCEPSS rescore
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  73. 2026-06-30 23:21 UTCEPSS rescore
  74. 2026-06-30 23:21 UTCEPSS rescore
  75. 2026-06-29 14:05 UTCEPSS rescore

Frequently asked(5)

What is CVE-2023-43804?
CVE-2023-43804 is a high vulnerability published on October 4, 2023. urllib3 is a user-friendly HTTP client library for Python. 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…
When was CVE-2023-43804 disclosed?
CVE-2023-43804 was first published in the National Vulnerability Database on October 4, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-43804 actively exploited?
CVE-2023-43804 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 33.1% of all scored CVEs.
What is the CVSS score of CVE-2023-43804?
CVE-2023-43804 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2023-43804?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-43804, 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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