PYSEC-2026-1433

See a problem?
Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/gunicorn/PYSEC-2026-1433.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-1433
Aliases
Published
2026-07-07T14:34:55.125128Z
Modified
2026-07-07T17:47:39.206895865Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N CVSS Calculator
Summary
Gunicorn HTTP Request/Response Smuggling vulnerability
Details

Gunicorn version 21.2.0 does not properly validate the value of the 'Transfer-Encoding' header as specified in the RFC standards, which leads to the default fallback method of 'Content-Length,' making it vulnerable to TE.CL request smuggling. This vulnerability can lead to cache poisoning, data exposure, session manipulation, SSRF, XSS, DoS, data integrity compromise, security bypass, information leakage, and business logic abuse.

References

Affected packages

PyPI / gunicorn

Package

Name
gunicorn
View open source insights on deps.dev
Purl
pkg:pypi/gunicorn

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
22.0.0

Affected versions

0.*
0.1
0.2
0.2.1
0.3
0.3.1
0.3.2
0.4
0.4.1
0.4.2
0.5
0.5.1
0.6
0.6.1
0.6.2
0.6.3
0.6.4
0.6.5
0.6.6
0.7.0
0.7.1
0.7.2
0.8.0
0.8.1
0.9.0
0.9.1
0.10.0
0.10.1
0.11.0
0.11.1
0.11.2
0.12.0
0.12.1
0.12.2
0.13.0
0.13.1
0.13.2
0.13.3
0.13.4
0.14.0
0.14.1
0.14.2
0.14.3
0.14.4
0.14.5
0.14.6
0.15.0
0.16.0
0.16.1
0.17.0
0.17.1
0.17.2
0.17.3
0.17.4
17.*
17.5
18.*
18.0
19.*
19.0.0
19.1.0
19.1.1
19.2.0
19.2.1
19.3.0
19.4.0
19.4.1
19.4.2
19.4.3
19.4.4
19.4.5
19.5.0
19.6.0
19.7.0
19.7.1
19.8.0
19.8.1
19.9.0
19.10.0
20.*
20.0.0
20.0.1
20.0.2
20.0.3
20.0.4
20.1.0
21.*
21.0.0
21.0.1
21.1.0
21.2.0

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/gunicorn/PYSEC-2026-1433.yaml"