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TI-2026-13296 Aliases CVE-2026-15806GHSA-2v69-2w5x-455j

`HTTPPasswordMgr` can send saved HTTPS credentials via HTTP because of incorrect scheme matching

Priority MEDIUM 60CWE-319Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Passive
Attack complexity
High
Attack requirements
Present
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-319.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00528 44th percentileScored 2026-11-07
Fix Fixed CPython (Python Software Foundation): 3.10.22, 3.11.17, 3.12.15 +3Red Hat: 5 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Python Software FoundationCPythonbefore 3.10.22; 3.11.0 to before 3.11.17; 3.12.0 to before 3.12.15; 3.13.0 to before 3.13.16; 3.14.0 to before 3.14.8; 3.15.0a1 to before 3.15.0rc23.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.8, 3.15.0rc2Patch availableCNA
  • CPython VendorPython Software Foundation Affected before 3.10.22; 3.11.0 to before 3.11.17; 3.12.0 to before 3.12.15; 3.13.0 to before 3.13.16; 3.14.0 to before 3.14.8; 3.15.0a1 to before 3.15.0rc2 Fixed in 3.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.8, 3.15.0rc2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:python:python:*:*:*:*:*:*:*:*——python-pillow
  • cpe:2.3:a:python:python:*:*:*:*:*:*:*:* Versions — — ·python-pillow

Remediation

  • Fix · CNA CPython (Python Software Foundation) Fixed in 3.10.22, 3.11.17, 3.12.15, 3.13.16, 3.14.8, 3.15.0rc2

Red Hat 5 advisories

  • RHSA-2026:65567 Released 2026-09-08 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images python3.13-3.13.15-1.1.hum1@aarch64, python3.13-3.13.15-1.1.hum1@src, python3.13-3.13.15-1.1.hum1@x86_64 +16
  • RHSA-2026:65531 Released 2026-09-08 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images python3.12-3.12.14-1.1.hum1@aarch64, python3.12-3.12.14-1.1.hum1@src, python3.12-3.12.14-1.1.hum1@x86_64 +12
  • RHSA-2026:65525 Released 2026-09-08 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images python3.11-3.11.16-1.2.hum1@aarch64, python3.11-3.11.16-1.2.hum1@src, python3.11-3.11.16-1.2.hum1@x86_64 +12
Show 2 more Red Hat advisories
  • RHSA-2026:65513 Released 2026-09-08 · Red Hat rating Moderate
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images python3.10-3.10.21-1.1.hum1@aarch64, python3.10-3.10.21-1.1.hum1@src, python3.10-3.10.21-1.1.hum1@x86_64 +12
  • RHSA-2026:65505 Released 2026-09-08 · Red Hat rating Important
    Red Hat Hardened Images RPMs Security Update
    • Red Hat Hardened Images python-unversioned-command-3.14.7-1.1.hum1@noarch@public-hummingbird-aarch64-rpms, python-unversioned-command-3.14.7-1.1.hum1@noarch@public-hummingbird-x86_64-rpms, python3-3.14.7-1.1.hum1@aarch64 +28

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    Python Software Foundation CPython 3.10.22, 3.11.17 and 4 more versions

    2 records Highest priority Priority MEDIUM 1 MEDIUM, 1 LOW

    Other records, highest priority first

    • TI-2026-14214 stringprep.map_table_b2() deviates from RFC 3454 Table B.2Priority LOW 28
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Hardened ImagesFixed RHSA-2026:65505, RHSA-2026:65513, RHSA-2026:65525, RHSA-2026:65531, RHSA-2026:65567
Not affected: 1 product
  • Red Hat Hardened Images

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-15806
  2. 2026-10-03 Alias added: GHSA-2v69-2w5x-455j

References

Patch 8

Advisory 1

Other 1

  • TI-2024-07037 Quadratic complexity parsing cookies with backslashes CVSS 3.1HIGH 7.5
  • TI-2024-11791 Bypass extraction filter to modify file metadata outside extraction directory CVSS 3.1MEDIUM 5.3
  • TI-2024-00411 Quoted zip-bomb protection for zipfile CVSS 3.1MEDIUM 6.2
  • TI-2024-06422 Email header injection due to unquoted newlines CVSS 3.1MEDIUM 5.5
  • TI-2026-04606 Possible to hijack modules in current working directory CVSS 4.0MEDIUM 5.6
  • TI-2025-07587 ZIP64 End of Central Directory (EOCD) Locator record offset not checked CVSS 3.1MEDIUM 4.3
See all 83 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences