Riskcovery

CVE-2026-86414

leaking host credentials to HTTP proxy

State
Published
Severity
9.1 Critical
Published
Oct 20, 2026
Updated
Oct 30, 2026
Reserved
Sep 7, 2026

Read the record on cve.org

Description

An HTTP proxy can trick libcurl into sending the origin's credentials (Basic password, or a Negotiate/Kerberos ticket) to the proxy itself, by answering the `CONNECT` tunnel request with 401 `WWW-Authenticate:` instead of the expected 407 `Proxy-Authenticate:`.

Scores

CVSSScoreVectorSource
3.19.1 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:NCISA-ADP

Weaknesses

  • CWE-201 Insertion of Sensitive Information Into Sent Data

Affected Products

ProductVersions
curlcurl
  • 8.22.0 through 8.22.0Affected
  • 8.21.0 through 8.21.0Affected
  • 8.20.0 through 8.20.0Affected
  • 8.19.0 through 8.19.0Affected
  • 8.18.0 through 8.18.0Affected
  • 8.17.0 through 8.17.0Affected
  • 8.16.0 through 8.16.0Affected
  • 8.15.0 through 8.15.0Affected
  • 8.14.1 through 8.14.1Affected
  • 8.14.0 through 8.14.0Affected
  • 8.13.0 through 8.13.0Affected
  • 8.12.1 through 8.12.1Affected
  • 8.12.0 through 8.12.0Affected
  • 8.11.1 through 8.11.1Affected
  • 8.11.0 through 8.11.0Affected
  • 8.10.1 through 8.10.1Affected
  • 8.10.0 through 8.10.0Affected
  • 8.9.1 through 8.9.1Affected
  • 8.9.0 through 8.9.0Affected
  • 8.8.0 through 8.8.0Affected
  • 8.7.1 through 8.7.1Affected
  • 8.7.0 through 8.7.0Affected
  • 8.6.0 through 8.6.0Affected
  • 8.5.0 through 8.5.0Affected
  • 8.4.0 through 8.4.0Affected
  • and 147 more versions

References

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