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MediumFix available

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

Type: advisorySource: OSVRisk context updated1 source record

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.

Announced Source revision 3
Original source ↗
CVE context updated. The publisher announcement is unchanged.

BIT-python-2026-15806

Primary source · Revision 3

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:BIT-python-2026-15806

python

Source reference: /affected/0/package/name

Affected versions
Not stated in this record
Fixed versions
3.10.22

Source reference: /affected/0/ranges

3.11.17

Source reference: /affected/0/ranges

3.12.15

Source reference: /affected/0/ranges

3.13.16

Source reference: /affected/0/ranges

3.14.8

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "SEMVER",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "3.10.22"
          },
          {
            "introduced": "3.11.0"
          },
          {
            "fixed": "3.11.17"
          },
          {
            "introduced": "3.12.0"
          },
          {
            "fixed": "3.12.15"
          },
          {
            "introduced": "3.13.0"
          },
          {
            "fixed": "3.13.16"
          },
          {
            "introduced": "3.14.0"
          },
          {
            "fixed": "3.14.8"
          }
        ]
      }
    ],
    "package": {
      "name": "python",
      "purl": "pkg:bitnami/python",
      "ecosystem": "Bitnami"
    },
    "severity": [
      {
        "type": "CVSS_V4",
        "score": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"
      }
    ],
    "database_specific": {
      "source": "https://github.com/bitnami/vulndb/tree/main/data/python/BIT-python-2026-15806.json"
    }
  }
]
Related CVEs
CVE-2026-15806

Source reference: /aliases

Publisher severity

medium

Source reference: /database_specific/severity

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-15806 · Medium

CPython

CVE-2026-15806 · Medium

libpython

CVE-2026-15806 · Medium

python-min

Event
#84213 · Revision 3
Added to Heist Feed
Publisher date
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