Answer in brief
CVE-2018-1000164 records a High severity (CVSS 7.5) vulnerability in Gunicorn contains Improper Neutralization of CRLF sequences in HTTP headers. The current sources do not mark it as known exploited. The current feed maps gunicorn (pip), gunicorn (pypi). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps gunicorn (pip), gunicorn (pypi). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| gunicornpip | <19.5.0 | 19.5.0 |
| gunicornpypi | >=0 <19.5.0 | 19.5.0 |
Published upstream
Jul 12, 2018
Evidence: source:ghsa:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:ghsa:source_dates:source-dates:recordFirst seen by HOL
Aug 7, 2026
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.
Quoted source text, attributed separately from HOL analysis.