An issue was discovered in urllib2 in Python 2.x through 2.7.17 and urllib in Python 3.x through 3.8.0. CRLF injection is possible if the attacker controls a url parameter, as demonstrated by the first argument to urllib.request.urlopen with \r\n (specifically in the host component of a URL) followed by an HTTP header. This is similar to the CVE-2019-9740 query string issue and the CVE-2019-9947 path string issue. (This is not exploitable when glibc has CVE-2016-10739 fixed.). This is fixed in: v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1; v3.6.11, v3.6.11rc1, v3.6.12; v3.7.8, v3.7.8rc1, v3.7.9; v3.8.3, v3.8.3rc1, v3.8.4, v3.8.4rc1, v3.8.5, v3.8.6, v3.8.6rc1.
CVSS Details
- CVSS 3.1 Base Score: 6.1
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade python2Upgrade python2-tkinter | Oct 1, 2024 | Oct 23, 2019 |
| Amazon_linux | — | Upgrade python34Upgrade python36Upgrade python34Upgrade python26Upgrade python35Upgrade python36Upgrade python27 | Sep 1, 2020 | Oct 23, 2019 |
| Debian | — | Upgrade python2.7 | Jul 16, 2020 | Oct 23, 2019 |
| F5 Big Ip | — | Update F5 BIG-IP to the latest version | Jun 17, 2026 | Aug 21, 2025 |
| Freebsd | — | Upgrade python37Upgrade python38Upgrade python27Upgrade python35Upgrade python36 | Sep 20, 2020 | Sep 20, 2020 |
| Oracle Solaris | — | Upgrade library/python/tkinter-35 to version 3.5.9-11.4.21.0.1.69.0 on Solaris 11.4Upgrade runtime/python-34 to version 3.4.10-11.4.21.0.1.69.0 on Solaris 11.4Upgrade runtime/python-37 to version 3.7.5-11.4.24.0.1.75.1 on Solaris 11.4Upgrade library/python/tkinter-37 to version 3.7.5-11.4.24.0.1.75.1 on Solaris 11.4Upgrade library/python/tkinter-34 to version 3.4.10-11.4.21.0.1.69.0 on Solaris 11.4Upgrade runtime/python-35 to version 3.5.9-11.4.21.0.1.69.0 on Solaris 11.4Upgrade runtime/python-27 to version 2.7.18-11.4.24.0.1.75.1 on Solaris 11.4Upgrade runtime/python-27/tests to version 2.7.18-11.4.24.0.1.75.1 on Solaris 11.4Upgrade library/python/tkinter-27 to version 2.7.18-11.4.24.0.1.75.1 on Solaris 11.4 | Jan 19, 2021 | Oct 23, 2019 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Oct 23, 2019 |
| Suse | — | Upgrade python3-doc-devhelpUpgrade libpython3_4m1_0-32bitUpgrade libpython3_6m1_0Upgrade python36Upgrade python-base-32bitUpgrade python-doc-pdfUpgrade pythonUpgrade shared-python-startupUpgrade python-gdbmUpgrade python-baseUpgrade python3-dbmUpgrade python3-baseUpgrade python-32bitUpgrade libpython2_7-1_0Upgrade python-idleUpgrade python3-idleUpgrade python-docUpgrade python3-develUpgrade libpython2_7-1_0-32bitUpgrade python3-base-32bitUpgrade python-xmlUpgrade python-demoUpgrade python3-tkUpgrade python-develUpgrade python3-testsuiteUpgrade python-rpm-macrosUpgrade python-tkUpgrade python3-toolsUpgrade python3-32bitUpgrade python3Upgrade libpython3_4m1_0Upgrade python3-docUpgrade libpython3_6m1_0-32bitUpgrade python3-cursesUpgrade python36-baseUpgrade python-curses | Mar 24, 2020 | Oct 23, 2019 |
| Ubuntu | — | Upgrade python3.6-minimalUpgrade python3.6Upgrade python3.4 (Ubuntu Pro)Upgrade python3.8Upgrade python3.7Upgrade python3.5-minimalUpgrade python3.6 (Ubuntu Pro)Upgrade python3.5 (Ubuntu Pro)Upgrade python3.8-minimalUpgrade python2.7 (Ubuntu Pro)Upgrade python3.8 (Ubuntu Pro)Upgrade python3.5-minimal (Ubuntu Pro)Upgrade python3.7 (Ubuntu Pro)Upgrade python2.7-minimal (Ubuntu Pro)Upgrade python2.7Upgrade python3.7-minimal (Ubuntu Pro)Upgrade python3.7-minimalUpgrade python3.4-minimal (Ubuntu Pro)Upgrade python3.5Upgrade python3.6-minimal (Ubuntu Pro)Upgrade python2.7-minimalUpgrade python3.8-minimal (Ubuntu Pro) | Apr 22, 2020 | Oct 23, 2019 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Oct 23, 2019 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub