CVE-2016-5699

PoC —

CVSS 3.0

6.1 medium

EPSS

10%p95

Published

Sep 2, 2016 (Sep 2, 2016)

Modified

Jun 17, 2026

Description

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.

Vendors: python
Products: python
Weakness: CWE-113
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (9.9%)

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