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TI-2020-15974 Aliases CVE-2020-26137GHSA-wqvq-5m8c-6g24

urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request…

Priority LOW 33CWE-74Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · None
Fix status
Partial Red Hat: 15 fixed, 5 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat.

Summary

urllib3 before 1.25.9 allows CRLF injection if the attacker controls the HTTP request method, as demonstrated by inserting CR and LF control characters in the first argument of putrequest(). NOTE: this is similar to CVE-2020-26116.

Why it matters now

EPSS 0.02269 83rd percentileScored 2026-11-07
Fix Partial urllib3 (PyPI): 1.25.9Red Hat: 6 advisoriesRed Hat: 15 fixed, 5 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
—urllib3 (PyPI)before 1.25.91.25.9Patch availableGHSA-wqvq-5m8c-6g24
  • — Vendor— Affected all versions Fixed in — No fix listed CNA
  • urllib3 (PyPI) Vendor— Affected before 1.25.9 Fixed in 1.25.9 Patch available GHSA-wqvq-5m8c-6g24

CPE configurations NVD · 7

CPEVersionsRoleVendor
cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:*before 1.25.9Vulnerablepython-pillow
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*20.04VulnerableCanonical
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:22.2.0:*:*:*:*:*:*:*22.2.0VulnerableOracle
cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*8.8VulnerableOracle
  • cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:* Versions before 1.25.9 Vulnerable ·python-pillow
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* Versions 20.04 Vulnerable ·Canonical
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:22.2.0:*:*:*:*:*:*:* Versions 22.2.0 Vulnerable ·Oracle
  • cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:* Versions 8.8 Vulnerable ·Oracle

Remediation

  • Fix · GHSA-wqvq-5m8c-6g24 urllib3 (PyPI) Fixed in 1.25.9 Advisory →

Red Hat 6 advisories

  • RHSA-2022:5235 Released 2022-06-28 · Red Hat rating Moderate
    python security update
    • Red Hat Enterprise Linux Client (v. 7) python-2.7.5-92.el7_9, python-libs-2.7.5-92.el7_9
    • Red Hat Enterprise Linux Client Optional (v. 7) python-debug-2.7.5-92.el7_9, python-devel-2.7.5-92.el7_9, python-test-2.7.5-92.el7_9 +2
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) python-debug-2.7.5-92.el7_9, python-test-2.7.5-92.el7_9, python-tools-2.7.5-92.el7_9 +1
    • Red Hat Enterprise Linux Server (v. 7) python-2.7.5-92.el7_9, python-devel-2.7.5-92.el7_9, python-libs-2.7.5-92.el7_9 +1
    • Red Hat Enterprise Linux Server Optional (v. 7) python-debug-2.7.5-92.el7_9, python-test-2.7.5-92.el7_9, python-tools-2.7.5-92.el7_9 +1
    • Red Hat Enterprise Linux Workstation (v. 7) python-2.7.5-92.el7_9, python-devel-2.7.5-92.el7_9, python-libs-2.7.5-92.el7_9
    • Red Hat Enterprise Linux Workstation Optional (v. 7) python-debug-2.7.5-92.el7_9, python-test-2.7.5-92.el7_9, python-tools-2.7.5-92.el7_9 +1
  • RHSA-2021:1631 Released 2021-05-18 · Red Hat rating Moderate
    python-urllib3 security update
    • Red Hat Enterprise Linux BaseOS (v. 8) python-urllib3-1.24.2-5.el8, python3-urllib3-1.24.2-5.el8
  • RHSA-2021:1761 Released 2021-05-18 · Red Hat rating Moderate
    python27:2.7 security and bug fix update
    • Red Hat Enterprise Linux AppStream (v. 8) Cython-0.28.1-7.module+el8.1.0+3111+de3f2d8e.src::python27:2.7, PyYAML-3.12-16.module+el8.1.0+3111+de3f2d8e.src::python27:2.7, babel-2.5.1-9.module+el8.1.0+3111+de3f2d8e.noarch::python27:2.7 +47
Show 3 more Red Hat advisories
  • RHSA-2021:0079 Released 2021-01-20 · Red Hat rating Moderate
    OpenShift Container Platform 3.11.374 bug fix and security update
    • Red Hat OpenShift Container Platform 3.11 atomic-enterprise-service-catalog-1:3.11.374-1.git.1675.738abcc.el7, atomic-enterprise-service-catalog-svcat-1:3.11.374-1.git.1675.738abcc.el7, atomic-openshift-3.11.374-1.git.0.ebd3ee9.el7 +30
  • RHSA-2021:0034 Released 2021-01-20 · Red Hat rating Important
    OpenShift Container Platform 4.5.27 packages and security update
    • Red Hat OpenShift Container Platform 4.5 jenkins-2-plugins-4.5.1610108899-1.el7, python-urllib3-1.26.2-1.el7, python2-urllib3-1.26.2-1.el7
  • RHSA-2020:4299 Released 2020-10-20 · Red Hat rating Moderate
    rh-python38 security, bug fix, and enhancement update
    • Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7) rh-python38-python-3.8.6-1.el7, rh-python38-python-debug-3.8.6-1.el7, rh-python38-python-devel-3.8.6-1.el7 +8
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6) rh-python38-python-3.8.6-1.el7, rh-python38-python-debug-3.8.6-1.el7, rh-python38-python-devel-3.8.6-1.el7 +8
    • Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7) rh-python38-python-3.8.6-1.el7, rh-python38-python-debug-3.8.6-1.el7, rh-python38-python-devel-3.8.6-1.el7 +8
    • Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7) rh-python38-python-3.8.6-1.el7, rh-python38-python-debug-3.8.6-1.el7, rh-python38-python-devel-3.8.6-1.el7 +8

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 6AffectedNo fix planned: Out of support scope
Red Hat OpenStack Platform 10 (Newton)AffectedNo fix planned: Out of support scope
Red Hat OpenStack Platform 13 (Queens)AffectedNo fix planned: Will not fix
Red Hat Software CollectionsAffectedNo fix planned: Will not fix
Red Hat Storage 3AffectedNo fix planned: Will not fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:1761
Red Hat Enterprise Linux BaseOS (v. 8)Fixed RHSA-2021:1631
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2022:5235
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2022:5235
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2022:5235
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2022:5235
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2022:5235
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2022:5235
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2022:5235
Red Hat OpenShift Container Platform 3.11Fixed RHSA-2021:0079
Red Hat OpenShift Container Platform 4.5Fixed RHSA-2021:0034
Red Hat Software Collections for Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:4299
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.6)Fixed RHSA-2020:4299
Red Hat Software Collections for Red Hat Enterprise Linux Server EUS (v. 7.7)Fixed RHSA-2020:4299
Red Hat Software Collections for Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:4299
Not affected: 5 products
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat OpenShift Container Platform 3.11
  • Red Hat OpenShift Container Platform 4.5
  • Red Hat Software Collections

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-26137
  2. 2026-10-03 Alias added: GHSA-wqvq-5m8c-6g24

References

Patch 4

Advisory 4

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences