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Servers and applications

CVE-2016-5699

CRLF injection vulnerability in the HTTPConnection.putheader function in urllib2 and urllib in CPython (aka Python) before 2.7.10 and 3.x before 3.4.4 allows remote attackers to inject arbitrary HTTP headers via CRLF sequences in a URL.

Severity
Medium 6.1
Published
2 Sept 2016
Last changed
17 Jun 2026
Added to UpHeron
21 Oct 2026
Sources
NVD

Affected software

SoftwareAffected versions
PythonServers and applications · cpe:a:python:python
  • Version 3.4.3
  • Version 3.4.2
  • Version 3.4.1
  • Version 3.4.0
All 27 release lines
  • Every version up to 2.7.9
  • Version 3.0
  • Version 3.0.1
  • Version 3.1.0
  • Version 3.1.1
  • Version 3.1.2
  • Version 3.1.3
  • Version 3.1.4
  • Version 3.1.5
  • Version 3.2.0
  • Version 3.2.1
  • Version 3.2.2
  • Version 3.2.3
  • Version 3.2.4
  • Version 3.2.5
  • Version 3.2.6
  • Version 3.3.0
  • Version 3.3.1
  • Version 3.3.2
  • Version 3.3.3
  • Version 3.3.4
  • Version 3.3.5
  • Version 3.3.6
  • Version 3.4.0
  • Version 3.4.1
  • Version 3.4.2
  • Version 3.4.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2016-5699
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2016-5699