Unprotected Alternate Channel Affecting python3 package, versions <0:3.14.7-1.1.hum1


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.53% (43rd percentile)

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  • Snyk IDSNYK-RHEL10-PYTHON3-19651315
  • published9 Sept 2026
  • disclosed18 Aug 2026

Introduced: 18 Aug 2026

CVE-2026-15806  (opens in a new tab)
CWE-420  (opens in a new tab)

How to fix?

Upgrade RHEL:10 python3 to version 0:3.14.7-1.1.hum1 or higher.
This issue was patched in RHSA-2026:65505.

NVD Description

Note: Versions mentioned in the description apply only to the upstream python3 package and not the python3 package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

The HTTPPasswordMgr class in the urllib.request module, along with its subclasses HTTPPasswordMgrWithDefaultRealm and HTTPPasswordMgrWithPriorAuth, did not take the URL scheme into account when matching stored credentials against a requested URL. Credentials added for an https:// URL were also used for requests to the same host over http://, so an attacker able to redirect or downgrade a client to plain HTTP (for example, via an HTTPS-to-HTTP redirect or an on-path position) could capture credentials in cleartext. Credentials added for http:// URLs could likewise be sent over https://.

Credential matching is now scoped by URL scheme. Credentials registered with a URL that includes a scheme are only used for requests with the same scheme. Credentials registered with a bare authority (such as example.com or example.com:8080) continue to match any scheme, preserving compatibility with existing code, including proxy authentication.

Users who cannot upgrade immediately can mitigate by ensuring that applications never make plain http:// requests to hosts for which credentials are registered, for example by not following redirects to http:// URLs.

CVSS Base Scores

version 3.1