8.1

CVE-2023-43804: `Cookie` HTTP header isn't stripped on cross-origin redirects

Modified
AliasesALPINE-CVE-2023-43804SUSE-SU-2023:4064-1SUSE-SU-2023:4108-1
Published 04-10-2023Last modified 03-11-2025

Vulnerability summary

CVE-2023-43804 is a high (CVSS 8.1) vulnerability in debian debian_linux. EPSS estimates a 1.36% chance of exploitation in the next 30 days, higher than 71.7% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
8.1/10
010
High · v3.1 (NVD)
EPSS score
1.36%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 25 · Related 13
DLA-3610-1DLA-3998-1OPENSUSE-SU-2026:12044-1OPENSUSE-SU-2026:12045-1RHSA-2023:6158RHSA-2023:6812

Timeline

  1. 04-10-2023
    PublishedVulnerability first disclosed.
  2. 03-11-2025
    Last modifiedVulnerability information updated.

Description

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 metrics

9 scores · 9 sources · 1 version

EPSS trend

Probability

1.36%

Chance of exploitation in the next 30 days

Percentile

72%

Versus all other CVEs

30-day change

No change 0.00 pp

From 1.36% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Suse17 products
  • python-urllib3&distro=HPE Helion OpenStack 8< 1.25.10-5.22.1
  • python-urllib3&distro=SUSE Linux Enterprise Micro 5.1< 1.25.10-150300.4.6.1
  • python-urllib3&distro=SUSE Linux Enterprise Micro 5.2< 1.25.10-150300.4.6.1
  • python-urllib3&distro=SUSE Linux Enterprise Micro 5.3< 1.25.10-150300.4.6.1
  • python-urllib3&distro=SUSE Linux Enterprise Micro 5.4< 1.25.10-150300.4.6.1
Chainguard10 products
  • dask-gateway< 2023.9.0-r1
  • graalvm-24-graalpy-venvAll versions (No fix recorded)
  • k8s-sidecar< 1.25.1-r2
  • kube-downscaler< 23.2.0-r6
  • kubeflow-jupyter-web-app< 1.7.0-r5
Wolfi6 products
  • dask-gateway< 2023.9.0-r1
  • k8s-sidecar< 1.25.1-r2
  • kube-downscaler< 23.2.0-r6
  • kubeflow-jupyter-web-app< 1.7.0-r5
  • kubeflow-volumes-web-app< 1.7.0-r6
Redhat3 products
  • python-urllib3< 0:1.25.10-5.el8ost
  • python3-urllib3< 0:1.25.10-5.el8ost
  • python3.11-urllib3< 0:1.26.12-2.el9 | < 0:1.26.12-2.el8
Debian2 products
  • python-urllib3< 1.26.12-1+deb12u1 | < 1.26.17-1
  • debian_linuxEOL10.0
Ubuntu2 products
  • python-pipAll versions (No fix recorded) | < 8.1.1-2ubuntu0.6+esm6 | < 9.0.1-2.3~ubuntu1.18.04.8+esm2 | < 20.0.2-5ubuntu1.10 | < 22.0.2+dfsg-1ubuntu0.4
  • python-urllib3< 1.13.1-2ubuntu0.16.04.4+esm1 | < 1.22-1ubuntu0.18.04.2+esm1 | < 1.25.8-2ubuntu0.3 | < 1.26.5-1~exp1ubuntu0.1
Alpine1 product
  • py3-urllib3< 1.26.17-r0
Fedoraproject1 product
Opensuse1 product
  • python-urllib3&distro=openSUSE Tumbleweed< 2.0.6-1.1
PyPI1 product
  • urllib3≥ 2.0.0, < 2.0.6 | < 01220354d389cd05474713f8c982d05c9b17aafb | < 1.26.17
Python1 product
  • urllib3< 1.26.17 | ≥ 2.0.0, < 2.0.6
Urllib31 product
  • urllib3≥ 2.0.0, < 2.0.6 | < 1.26.17

12 vendors · 46 products

References

40 links
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