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CVE-2026-15806

Published Aug 18, 2026 CWE-319 EPSS 0.41% (34th pctl)

Overview

CVE-2026-15806 is a known-severity vulnerability. It was published on August 18, 2026.

Technical Description

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 ens

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHub github.com/python/cpython/commit/641be42bb07921ba0f8bffe228b1dc706b092ef6 GitHub github.com/python/cpython/commit/851cf9a7142ecbdd39f831055533f58284ad2bcc GitHub github.com/python/cpython/commit/a0d023fbd23773e24b35d8368789470e22cda5d8 GitHub github.com/python/cpython/commit/a2773a34183b7d94a243bb98fd658926cc5348ce GitHub github.com/python/cpython/commit/a7bb524fef61f77ede01f660ffbd591e1d5837ce GitHub github.com/python/cpython/issues/155694 GitHub github.com/python/cpython/pull/155696 Ref mail.python.org/archives/list/[email protected]/thread/3OKPE5S75KDNA7FY7AI3PL2MXM2X5RB3/ Ref www.openwall.com/lists/oss-security/2026/08/18/3 GitHub github.com/python/cpython/issues/155694

Frequently Asked Questions

What is CVE-2026-15806?

CVE-2026-15806 is a known-severity vulnerability. It was published on August 18, 2026.

How severe is CVE-2026-15806?

CVSS score information is not yet available for this vulnerability. Check back as the CVE record is updated by NVD analysts.

How do I fix or remediate CVE-2026-15806?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-15806?

CyberStrike's AI-powered security agents can automatically detect CVE-2026-15806 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.

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