What’s Vulnerable › Vulnerabilities
CVE-2019-9740
- Severity: medium (CVSS 6.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 5.4% probability of exploitation in the next 30 days
- Public exploit or detection template: yes
- Published: 2019-03-13 · updated 2026-10-14
- Weakness: CWE-93
Description
An issue was discovered in urllib2 in Python 2.x through 2.7.16 and urllib in Python 3.x through 3.7.3. 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 query string after a ? character) followed by an HTTP header or a Redis command. This is fixed in: v2.7.17, v2.7.17rc1, v2.7.18, v2.7.18rc1; v3.5.10, v3.5.10rc1, v3.5.8, v3.5.8rc1, v3.5.8rc2, v3.5.9; v3.6.10, v3.6.10rc1, v3.6.11, v3.6.11rc1, v3.6.12, v3.6.9, v3.6.9rc1; v3.7.4, v3.7.4rc1, v3.7.4rc2, v3.7.5, v3.7.5rc1, v3.7.6, v3.7.6rc1, v3.7.7, v3.7.7rc1, v3.7.8, v3.7.8rc1, v3.7.9.
Affected products
- Python: from 2.0 before 2.7.17; from 3.5.0 before 3.5.8; from 3.6.0 before 3.6.9; from 3.7.0 before 3.7.4 — fixed in 2.7.17, 3.5.8, 3.6.9, 3.7.4
How to fix
Upgrade to a fixed version: Python 2.7.17, 3.5.8, 3.6.9, 3.7.4. Check the vendor advisory for mitigations.
References
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00039.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00041.html
- http://packetstormsecurity.com/files/154927/Slackware-Security-Advisory-python-Updates.html
- http://www.openwall.com/lists/oss-security/2021/02/04/2
- http://www.securityfocus.com/bid/107466
- https://access.redhat.com/errata/RHSA-2019:1260
- https://access.redhat.com/errata/RHSA-2019:2030
- https://access.redhat.com/errata/RHSA-2019:3335
- https://access.redhat.com/errata/RHSA-2019:3520
- https://access.redhat.com/errata/RHSA-2019:3725
- https://bugs.python.org/issue36276
- https://lists.debian.org/debian-lts-announce/2019/06/msg00022.html
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