CVE-2018-1000164

Publication date 18 April 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

gunicorn version 19.4.5 contains a CWE-113: Improper Neutralization of CRLF Sequences in HTTP Headers vulnerability in "process_headers" function in "gunicorn/http/wsgi.py" that can result in an attacker causing the server to return arbitrary HTTP headers. This vulnerability appears to have been fixed in 19.5.0.

From the Ubuntu Security Team

It was discovered that gunicorn improperly handled certain input. An attacker could potentially use this issue execute a cross-site scripting (XSS) attack.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
gunicorn	22.04 LTS jammy	Not affected
	21.10 impish	Not affected
	21.04 hirsute	Not affected
	20.10 groovy	Not affected
	20.04 LTS focal	Not affected
	19.10 eoan	Not affected
	19.04 disco	Not affected
	18.10 cosmic	Not affected
	18.04 LTS bionic	Not affected
	17.10 artful	Not affected
	16.04 LTS xenial	Fixed 19.4.5-1ubuntu1.1
	14.04 LTS trusty	Fixed 17.5-2ubuntu0.1~esm1

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Notes

mdeslaur

there are no reverse-depends on gunicorn in trusty, lowering priority to low

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
gunicorn	Upstream: 5263a4e Upstream: https://github.com/benoitc/gunicorn/pull/1229/files

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Related Ubuntu Security Notices (USN)

USN-4022-1
Gunicorn vulnerability
19 June 2019