CVE-2020-26137
MEDIUM6.5EPSS 0.28%CRLF injection in urllib3
Published: 6/18/2021Modified: 4/28/2026
Description
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.
Affected packages (4)
- Alpine/py3-urllib3from 0, < 1.25.9-r0
- Debian/python-urllib3from 0, < 1.25.9-1
- PyPI/urllib3from 0, < 1.25.9
- PyPI/urllib3from 0, < 1dd69c5c5982fae7c87a620d487c2ebf7a6b436b | from 0, < 1.25.9
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | MEDIUM6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N |
References (15)
- ADVISORYhttps://github.com/advisories/GHSA-wqvq-5m8c-6g24
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2020-26137
- ADVISORYhttps://security.alpinelinux.org/vuln/CVE-2020-26137
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2020-26137
- PATCHhttps://github.com/urllib3/urllib3
- WEBhttps://bugs.python.org/issue39603
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-148.yaml
- WEBhttps://github.com/urllib3/urllib3/commit/1dd69c5c5982fae7c87a620d487c2ebf7a6b436b
- WEBhttps://github.com/urllib3/urllib3/pull/1800
- WEBhttps://lists.debian.org/debian-lts-announce/2021/06/msg00015.html
- WEBhttps://lists.debian.org/debian-lts-announce/2023/10/msg00012.html
- WEBhttps://usn.ubuntu.com/4570-1
- WEBhttps://usn.ubuntu.com/4570-1/
- WEBhttps://www.oracle.com/security-alerts/cpujul2022.html
- WEBhttps://www.oracle.com/security-alerts/cpuoct2021.html