In the urllib3 library through 1.24.1 for Python, CRLF injection is possible if the…
Priority LOW 31CWE-93Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- Low · Low · None
- Fix status
- Partial Red Hat: 13 fixed, 15 without a fix
Attack profile from CVSS 3.0 · NVD. Fix status from CNA, GitHub and Red Hat.
Summary
In the urllib3 library through 1.24.1 for Python, CRLF injection is possible if the attacker controls the request parameter.
Why it matters now
EPSS 0.02073 81st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial urllib3 (PyPI): 1.24.3Red Hat: 9 advisoriesRed Hat: 13 fixed, 15 without a fix
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | urllib3 (PyPI) | before 1.24.3 | 1.24.3 | Patch available | GHSA-r64q-w8jr-g9qp |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- urllib3 (PyPI) Vendor— Affected before 1.24.3 Fixed in 1.24.3 Patch available GHSA-r64q-w8jr-g9qp
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:* | up to 1.24.2 | Vulnerable | python-pillow |
- cpe:2.3:a:python:urllib3:*:*:*:*:*:*:*:* Versions up to 1.24.2 Vulnerable ·python-pillow
Remediation
- Fix · GHSA-r64q-w8jr-g9qp urllib3 (PyPI) Fixed in 1.24.3 Advisory →
Red Hat 9 advisories
- RHSA-2020:2068 Released 2020-05-12 · Red Hat rating Moderatepython-pip security update
- Red Hat Enterprise Linux Client (v. 7) python-pip-9.0.3-7.el7_8, python3-pip-9.0.3-7.el7_8
- Red Hat Enterprise Linux ComputeNode (v. 7) python-pip-9.0.3-7.el7_8, python3-pip-9.0.3-7.el7_8
- Red Hat Enterprise Linux Server (v. 7) python-pip-9.0.3-7.el7_8, python3-pip-9.0.3-7.el7_8
- Red Hat Enterprise Linux Workstation (v. 7) python-pip-9.0.3-7.el7_8, python3-pip-9.0.3-7.el7_8
- RHSA-2020:2081 Released 2020-05-12 · Red Hat rating Moderatepython-virtualenv security update
- Red Hat Enterprise Linux Client Optional (v. 7) python-virtualenv-15.1.0-4.el7_8
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) python-virtualenv-15.1.0-4.el7_8
- Red Hat Enterprise Linux Server (v. 7) python-virtualenv-15.1.0-4.el7_8
- Red Hat Enterprise Linux Workstation (v. 7) python-virtualenv-15.1.0-4.el7_8
- RHSA-2020:1605 Released 2020-04-28 · Red Hat rating Moderatepython27:2.7 security, bug fix, and enhancement 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 6 more Red Hat advisories
- RHSA-2020:1916 Released 2020-04-28 · Red Hat rating Moderatepython-pip security update
- Red Hat Enterprise Linux AppStream (v. 8) python3-pip-9.0.3-16.el8
- Red Hat Enterprise Linux BaseOS (v. 8) platform-python-pip-9.0.3-16.el8, python-pip-9.0.3-16.el8, python3-pip-wheel-9.0.3-16.el8
- RHSA-2020:0851 Released 2020-03-17 · Red Hat rating Moderatepython-virtualenv security update
- Red Hat Enterprise Linux Client Optional (v. 7) python-virtualenv-15.1.0-4.el7_7
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) python-virtualenv-15.1.0-4.el7_7
- Red Hat Enterprise Linux Server (v. 7) python-virtualenv-15.1.0-4.el7_7
- Red Hat Enterprise Linux Workstation (v. 7) python-virtualenv-15.1.0-4.el7_7
- RHSA-2020:0850 Released 2020-03-17 · Red Hat rating Moderatepython-pip security update
- Red Hat Enterprise Linux Client (v. 7) python-pip-9.0.3-7.el7_7, python3-pip-9.0.3-7.el7_7
- Red Hat Enterprise Linux ComputeNode (v. 7) python-pip-9.0.3-7.el7_7, python3-pip-9.0.3-7.el7_7
- Red Hat Enterprise Linux Server (v. 7) python-pip-9.0.3-7.el7_7, python3-pip-9.0.3-7.el7_7
- Red Hat Enterprise Linux Workstation (v. 7) python-pip-9.0.3-7.el7_7, python3-pip-9.0.3-7.el7_7
- RHSA-2019:3590 Released 2019-11-05 · Red Hat rating Moderatepython-urllib3 security update
- Red Hat Enterprise Linux BaseOS (v. 8) python-urllib3-1.24.2-2.el8, python3-urllib3-1.24.2-2.el8
- RHSA-2019:3335 Released 2019-11-05 · Red Hat rating Moderatepython27:2.7 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
- RHSA-2019:2272 Released 2019-08-06 · Red Hat rating Moderatepython-urllib3 security update
- Red Hat Enterprise Linux Client (v. 7) python-urllib3-1.10.2-7.el7
- Red Hat Enterprise Linux ComputeNode (v. 7) python-urllib3-1.10.2-7.el7
- Red Hat Enterprise Linux Server (v. 7) python-urllib3-1.10.2-7.el7
- Red Hat Enterprise Linux Workstation (v. 7) python-urllib3-1.10.2-7.el7
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Will not fix |
| Red Hat OpenShift Container Platform 3.10 | Affected | No fix planned: Out of support scope |
| Red Hat OpenShift Container Platform 3.11 | Affected | No fix planned: Will not fix |
| Red Hat OpenShift Container Platform 3.6 | Affected | No fix planned: Out of support scope |
| Red Hat OpenShift Container Platform 3.7 | Affected | No fix planned: Out of support scope |
| Red Hat OpenShift Container Platform 3.9 | Affected | No fix planned: Out of support scope |
| Red Hat OpenStack Platform 10 (Newton) | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 13 (Queens) | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 14 (Rocky) | Affected | No fix yet |
| Red Hat OpenStack Platform 15 (Stein) | Affected | No fix yet |
| Red Hat OpenStack Platform 8 (Liberty) | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 9 (Mitaka) | Affected | No fix planned: Will not fix |
| Red Hat Satellite 6 | Affected | No fix planned: Out of support scope |
| Red Hat Software Collections | Affected | No fix planned: Will not fix |
| Red Hat Storage 3 | Affected | No fix planned: Will not fix |
| Red Hat Ansible Tower 3.5 for RHEL 7 Server | Fixed | — |
| Red Hat Ansible Tower 3.6 for RHEL 7 | Fixed | — |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2019:3335, RHSA-2020:1605, RHSA-2020:1916 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2019:3590, RHSA-2020:1916 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2019:2272, RHSA-2020:0850, RHSA-2020:2068 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2020:0851, RHSA-2020:2081 |
| Red Hat Enterprise Linux ComputeNode (v. 7) | Fixed | RHSA-2019:2272, RHSA-2020:0850, RHSA-2020:2068 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2020:0851, RHSA-2020:2081 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2019:2272, RHSA-2020:0850, RHSA-2020:0851, RHSA-2020:2068, RHSA-2020:2081 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2019:2272, RHSA-2020:0850, RHSA-2020:0851, RHSA-2020:2068, RHSA-2020:2081 |
| Red Hat OpenShift Container Platform 4.3 | Fixed | — |
| Red Hat OpenShift Container Platform 4.4 | Fixed | — |
| Red Hat OpenShift Container Platform 4.6 | Fixed | — |
Not affected: 3 products
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4.3
- Red Hat OpenShift Container Platform 4.4
Timeline
- 2026-10-02 Threatist record created from CVE-2019-11236
- 2026-10-03 Alias added: GHSA-r64q-w8jr-g9qp
- 2026-10-30 Fix available: Red Hat OpenShift Container Platform 4.6 · Red Hat
References
Advisory 13
Other 11
- [debian-lts-announce] 20190620 [SECURITY] [DLA 1828-1] python-urllib3 security update
- [debian-lts-announce] 20210615 [SECURITY] [DLA 2686-1] python-urllib3 security update
- [debian-lts-announce] 20231008 [SECURITY] [DLA 3610-1] python-urllib3 security update
- https://usn.ubuntu.com/3990-2
- https://usn.ubuntu.com/3990-1
- https://lists.fedoraproject.org/archives/list/[email protected]/message/XOSA2NT4DUQDBEIWE6O7KKD24XND7TE2
- https://lists.fedoraproject.org/archives/list/[email protected]/message/TBI45HO533KYHNB5YRO43TBYKA3E3VRL
- https://lists.fedoraproject.org/archives/list/[email protected]/message/R62XGEYPUTXMRHGX5I37EBCGQ5COHGKR
- https://lists.fedoraproject.org/archives/list/[email protected]/message/NKGPJLVLVYCL4L4B4G5TIOTVK4BKPG72
- https://github.com/urllib3/urllib3
- https://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2019-132.yaml
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-2019-11236 · CVE Program
- CVE-2019-11236 · NVD
- FIRST EPSS
- GHSA-r64q-w8jr-g9qp · GitHub Advisory Database · CC BY 4.0
- CVE-2019-11236 · 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