CVE-2020-26116 Other in n/a

High 7.2 Published 27 Sep 2020 Updated 14 Oct 2026

Attackers can inject CRLF characters into HTTP requests via the http.client module, potentially leading to request smuggling or header injection.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2020-26116?

CVE-2020-26116 is a high-severity vulnerability in Canonical Ubuntu Linux, published on 27 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

http.client in Python 3.x before 3.5.10, 3.6.x before 3.6.12, 3.7.x before 3.7.9, and 3.8.x before 3.8.5 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 HTTPConnection.request.

Weakness: CWE-74

Which versions are affected by CVE-2020-26116?

3 open source packages ship an affected version, including libpython, python and python-min. It affects 8 products.

Package	Affected	Fixed in
`libpython` Bitnami	From `3.0.0`	`3.5.10, 3.6.12, 3.7.9, 3.8.5`
`python` Bitnami	From `3.0.0`	`3.5.10, 3.6.12, 3.7.9, 3.8.5`
`python-min` Bitnami	From `3.0.0`	`3.5.10, 3.6.12, 3.7.9, 3.8.5`

Linux distribution packages (37)

`platform-python` Red Hat:rhel_eus:8.2::appstream	All versions	`0:3.6.8-24.el8_2`
`platform-python-debug` Red Hat:rhel_eus:8.2::appstream	All versions	`0:3.6.8-24.el8_2`
`platform-python-devel` Red Hat:rhel_eus:8.2::appstream	All versions	`0:3.6.8-24.el8_2`
`python3-debuginfo` Red Hat:rhel_eus:8.2::appstream	All versions	`0:3.6.8-24.el8_2`
`python3-debugsource` Red Hat:rhel_eus:8.2::appstream	All versions	`0:3.6.8-24.el8_2`
`python3-idle` Red Hat:rhel_eus:8.2::appstream	All versions	`0:3.6.8-24.el8_2`
`python3-test` Red Hat:rhel_eus:8.2::appstream	All versions	`0:3.6.8-24.el8_2`
`python3-tkinter` Red Hat:rhel_eus:8.2::appstream	All versions	`0:3.6.8-24.el8_2`
`platform-python` Red Hat:rhel_eus:8.2::baseos	All versions	`0:3.6.8-24.el8_2`
`python3` Red Hat:rhel_eus:8.2::baseos	All versions	`0:3.6.8-24.el8_2`
`python3-debuginfo` Red Hat:rhel_eus:8.2::baseos	All versions	`0:3.6.8-24.el8_2`
`python3-debugsource` Red Hat:rhel_eus:8.2::baseos	All versions	`0:3.6.8-24.el8_2`
`python3-libs` Red Hat:rhel_eus:8.2::baseos	All versions	`0:3.6.8-24.el8_2`
`python3-test` Red Hat:rhel_eus:8.2::baseos	All versions	`0:3.6.8-24.el8_2`
`python` SUSE:Enterprise Storage 5	All versions	`2.7.17-28.56.1`
`python-urllib3` SUSE:Enterprise Storage 5	All versions	`1.22-3.23.1`
`python-urllib3` SUSE:HPE Helion OpenStack 8	All versions	`1.22-5.15.1`
`python-urllib3` SUSE:Linux Enterprise High Performance Computing 15-ESPOS	All versions	`1.22-6.12.1`
`python-urllib3` SUSE:Linux Enterprise High Performance Computing 15-LTSS	All versions	`1.22-6.12.1`
`python` SUSE:Linux Enterprise Module for Basesystem 15 SP1	All versions	`2.7.17-7.44.4`
`python-base` SUSE:Linux Enterprise Module for Basesystem 15 SP1	All versions	`2.7.17-7.44.2`
`python` SUSE:Linux Enterprise Module for Basesystem 15 SP2	All versions	`2.7.17-7.44.4`
`python-base` SUSE:Linux Enterprise Module for Basesystem 15 SP2	All versions	`2.7.17-7.44.2`
`python` SUSE:Linux Enterprise Module for Desktop Applications 15 SP1	All versions	`2.7.17-7.44.4`
`python` SUSE:Linux Enterprise Module for Desktop Applications 15 SP2	All versions	`2.7.17-7.44.4`
`python-urllib3` SUSE:Linux Enterprise Module for Public Cloud 12	All versions	`1.22-3.23.1`
`python` SUSE:Linux Enterprise Module for Python 2 15 SP1	All versions	`2.7.17-7.44.4`
`python-base` SUSE:Linux Enterprise Module for Python 2 15 SP1	All versions	`2.7.17-7.44.2`
`python` SUSE:Linux Enterprise Module for Python 2 15 SP2	All versions	`2.7.17-7.44.4`
`python-base` SUSE:Linux Enterprise Module for Python 2 15 SP2	All versions	`2.7.17-7.44.2`
`python3` SUSE:Linux Enterprise Module for Web and Scripting 12	All versions	`3.4.10-25.55.1`
`python3-base` SUSE:Linux Enterprise Module for Web and Scripting 12	All versions	`3.4.10-25.55.1`
`python` SUSE:Linux Enterprise Point of Sale 11 SP3	All versions	`2.6.9-40.48.1`
`python-base` SUSE:Linux Enterprise Point of Sale 11 SP3	All versions	`2.6.9-40.48.1`
`python-doc` SUSE:Linux Enterprise Point of Sale 11 SP3	All versions	`2.6-8.40.48.1`
`python` SUSE:Linux Enterprise Server 11 SP4-LTSS	All versions	`2.6.9-40.48.1`
`python-base` SUSE:Linux Enterprise Server 11 SP4-LTSS	All versions	`2.6.9-40.48.1`

Products include Canonical Ubuntu Linux, Debian Debian Linux, Fedoraproject Fedora, Netapp Hci Storage Node, Netapp Solidfire, Opensuse Leap and 2 more.

How do I fix CVE-2020-26116?

Upgrade libpython to a fixed version for your release line: 3.5.10, 3.6.12, 3.7.9 or 3.8.5.

Is CVE-2020-26116 being exploited?

There is no known exploitation of CVE-2020-26116 in the wild and no public exploit code.

All Canonical Ubuntu Linux vulnerabilities

Sources

Also known as BIT-libpython-2020-26116, BIT-python-2020-26116, BIT-python-min-2020-26116, CLSA-2023-1698945913, DEBIAN-CVE-2020-26116, GHSA-w7gf-rpqw-gx4f and 15 more.