PYSEC-2026-1873

See a problem?
Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/requests/PYSEC-2026-1873.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2026-1873
Aliases
Published
2026-07-07T11:45:42.890131Z
Modified
2026-07-07T17:46:36.762141019Z
Severity
  • 5.6 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:N CVSS Calculator
Summary
Requests `Session` object does not verify requests after making first request with verify=False
Details

When using a requests.Session, if the first request to a given origin is made with verify=False, TLS certificate verification may remain disabled for all subsequent requests to that origin, even if verify=True is explicitly specified later.

This occurs because the underlying connection is reused from the session's connection pool, causing the initial TLS verification setting to persist for the lifetime of the pooled connection. As a result, applications may unintentionally send requests without certificate verification, leading to potential man-in-the-middle attacks and compromised confidentiality or integrity.

This behavior affects versions of requests prior to 2.32.0.

References

Affected packages

PyPI / requests

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.32.0

Affected versions

0.*
0.0.1
0.2.0
0.2.1
0.2.2
0.2.3
0.2.4
0.3.0
0.3.1
0.3.2
0.3.3
0.3.4
0.4.0
0.4.1
0.5.0
0.5.1
0.6.0
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
0.7.3
0.7.4
0.7.5
0.7.6
0.8.0
0.8.1
0.8.2
0.8.3
0.8.4
0.8.5
0.8.6
0.8.7
0.8.8
0.8.9
0.9.0
0.9.1
0.9.2
0.9.3
0.10.0
0.10.1
0.10.2
0.10.3
0.10.4
0.10.6
0.10.7
0.10.8
0.11.1
0.11.2
0.12.0
0.12.01
0.12.1
0.13.0
0.13.1
0.13.2
0.13.3
0.13.4
0.13.5
0.13.6
0.13.7
0.13.8
0.13.9
0.14.0
0.14.1
0.14.2
1.*
1.0.0
1.0.1
1.0.2
1.0.3
1.0.4
1.1.0
1.2.0
1.2.1
1.2.2
1.2.3
2.*
2.0.0
2.0.1
2.1.0
2.2.0
2.2.1
2.3.0
2.4.0
2.4.1
2.4.2
2.4.3
2.5.0
2.5.1
2.5.2
2.5.3
2.6.0
2.6.1
2.6.2
2.7.0
2.8.0
2.8.1
2.9.0
2.9.1
2.9.2
2.10.0
2.11.0
2.11.1
2.12.0
2.12.1
2.12.2
2.12.3
2.12.4
2.12.5
2.13.0
2.14.0
2.14.1
2.14.2
2.15.0
2.15.1
2.16.0
2.16.1
2.16.2
2.16.3
2.16.4
2.16.5
2.17.0
2.17.1
2.17.2
2.17.3
2.18.0
2.18.1
2.18.2
2.18.3
2.18.4
2.19.0
2.19.1
2.20.0
2.20.1
2.21.0
2.22.0
2.23.0
2.24.0
2.25.0
2.25.1
2.26.0
2.27.0
2.27.1
2.28.0
2.28.1
2.28.2
2.29.0
2.30.0
2.31.0

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/requests/PYSEC-2026-1873.yaml"