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Vulnerabilities

Vulnerability · CVE-2026-15806

The HTTPPasswordMgr class in the urllib.request module, along with its subclasses HTTPPasswordMgrWithDefaultRealm and HTTPPasswordMgrWithPriorAuth, did not take the URL scheme into

Published Aug 18, 2026 · catalog updated Oct 28, 2026 · The HTTPPasswordMgr class in

Last checked Oct 31, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-15806. EPSS is 0.53%. Act only if a listed version of The HTTPPasswordMgr class in is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (The HTTPPasswordMgr class in).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.53%
Remediation
Advisory link
Affected products
Debian:12 pypy3 · Debian:12 python3.11 · Debian:13 pypy3 · Debian:13 python3.13 · Debian:14 pypy3 · Debian:14 python3.13

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • Debian:12 pypy37.3.11+dfsg-2, 7.3.11+dfsg-2+deb12u1, 7.3.11+dfsg-2+deb12u2
  • Debian:12 python3.110 → 3.11.2-6+deb12u9
  • Debian:13 pypy37.3.19+dfsg-2, 7.3.20+dfsg-1, 7.3.20+dfsg-2
  • Debian:13 python3.133.13.11-1, 3.13.12-1, 3.13.14-1
  • Debian:14 pypy30 → 8.0.1+dfsg-1
  • Debian:14 python3.133.13.11-1, 3.13.12-1, 3.13.14-1
  • Debian:14 python3.140 → 3.14.7-3
  • Debian:14 python3.150 → 3.15.0~rc2-1

How to fix CVE-2026-15806

  • Upgrade

    CVE-2026-15806 lists a fix boundary at 3.11.2-6+deb12u9. Compare the installed build with that boundary before you change production.

  • Version check

    Fixed in 3.11.2-6+deb12u9 · 13 other ranges on the advisory

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-15806. EPSS is 0.53%. Act only if a listed version of The HTTPPasswordMgr class in is installed.

Which versions are affected?

Compare what you have installed with 7.3.11+dfsg-2, 7.3.11+dfsg-2+deb12u1, 7.3.11+dfsg-2+deb12u2, 0 → 3.11.2-6+deb12u9, 7.3.19+dfsg-2, 7.3.20+dfsg-1, 7.3.20+dfsg-2, 3.13.11-1, 3.13.12-1, 3.13.14-1, 0 → 8.0.1+dfsg-1, 0 → 3.14.7-3. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.53%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Debian security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 18, 2026 · Trivy Vulnerability DB

    Detected

    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

  2. Oct 28, 2026 · Trivy Vulnerability DB

    Fix available

    pypy3 fixed in 8.0.1+dfsg-1; python3.11 fixed in 3.11.2-6+deb12u9; python3.14 fixed in 3.14.7-3; python3.15 fixed in 3.15.0~rc2-1

  3. Oct 28, 2026 · Trivy Vulnerability DB

    Fix available

    pypy3 fixed in 8.0.1+dfsg-1

  4. Oct 28, 2026 · Trivy Vulnerability DB

    Fix available

    python3.11 fixed in 3.11.2-6+deb12u9

  5. Oct 28, 2026 · Trivy Vulnerability DB

    Fix available

    python3.14 fixed in 3.14.7-3

  6. Oct 28, 2026 · Trivy Vulnerability DB

    Fix available

    python3.15 fixed in 3.15.0~rc2-1

  7. Oct 28, 2026 · Trivy Vulnerability DB

    Updated

    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

Sources

  • CVE.orgVulnerability recordCVE-2026-15806

    Official CVE identifier

    cve.org
  • Trivy Vulnerability DBPackage advisoryDEBIAN-CVE-2026-15806

    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://

    osv.dev

References

Freshness

Last verified in this catalog Oct 31, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 28, 2026
  • Trivy Vulnerability DBOct 28, 2026