CVE-2020-26137: CRLF injection in urllib3

CVE-2020-26137 · Severity: low · CVSS 3.1 · Published 2020-09-30

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.

Technologies: urllib3 (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2020-26137 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2020-26137 being exploited in the wild.
How severe is CVE-2020-26137?
Low severity, with a CVSS score of 3.1, published 30 September 2020.
Which products and versions are affected?
urllib3 (PyPI) ECOSYSTEM:introduced=0,fixed=1.25.9, GIT:introduced=0,fixed=1dd69c5c5982fae7c87a620d487c2ebf7a6b436b|ECOSYSTEM:introduced=0,fixed=1.25.9.
Is there a fix for CVE-2020-26137?
Yes. urllib3 (PyPI): upgrade to 1.25.9 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2020-26137?
Check whether you run urllib3 (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • urllib3 (PyPI): upgrade to 1.25.9 or later
    pip install "urllib3>=1.25.9"

Affected products

  • urllib3 (PyPI) ECOSYSTEM:introduced=0,fixed=1.25.9, GIT:introduced=0,fixed=1dd69c5c5982fae7c87a620d487c2ebf7a6b436b|ECOSYSTEM:introduced=0,fixed=1.25.9

Identifiers

  • CVE-2020-26137
  • GHSA-wqvq-5m8c-6g24
  • PYSEC-2020-148

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