What’s Vulnerable › Vulnerabilities

CVE-2018-1000164

• Severity: high (CVSS 7.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2018-04-18 · updated 2026-06-17
• Weakness: CWE-93

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.

Affected products

• Debian Linux: 7.0, 8.0
• Gunicorn: 19.4.5

References

• https://epadillas.github.io/2018/04/02/http-header-splitting-in-gunicorn-19.4.5
• https://github.com/benoitc/gunicorn/issues/1227
• https://lists.debian.org/debian-lts-announce/2018/04/msg00022.html
• https://usn.ubuntu.com/4022-1/
• https://www.debian.org/security/2018/dsa-4186
• https://epadillas.github.io/2018/04/02/http-header-splitting-in-gunicorn-19.4.5
• https://github.com/benoitc/gunicorn/issues/1227
• https://lists.debian.org/debian-lts-announce/2018/04/msg00022.html
• https://usn.ubuntu.com/4022-1/
• https://www.debian.org/security/2018/dsa-4186

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