libcurl could accidentally return a URL for `curl_easy_getinfo()`'s `CURLINFO_EFFECTIVE_URL` option containing credentials, even though neither the URL provided to libcurl nor the redirected URL did.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Curl
  • Curl

No data.

No data.

References
Link Providers
https://curl.se/docs/CVE-2026-94266.html cve-icon cve-icon
https://curl.se/docs/CVE-2026-94266.json cve-icon cve-icon
https://hackerone.com/reports/4041053 cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-94266 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-94266 cve-icon
History

Tue, 20 Oct 2026 20:45:00 +0000

Type Values Removed Values Added
Description A flaw was found in curl. This vulnerability can lead to information disclosure by inadvertently revealing authentication credentials. When curl retrieves credentials from a local configuration file (such as a .netrc file), requesting the effective URL metadata can cause the returned destination address to improperly include those secret credentials. A local user may exploit this issue to view sensitive authentication tokens if an application or script queries and logs or displays the resolved URL. libcurl could accidentally return a URL for `curl_easy_getinfo()`'s `CURLINFO_EFFECTIVE_URL` option containing credentials, even though neither the URL provided to libcurl nor the redirected URL did.
Title curl: curl: password leak in CURLINFO_EFFECTIVE_URL password leak in CURLINFO_EFFECTIVE_URL
References

Sun, 18 Oct 2026 20:15:00 +0000

Type Values Removed Values Added
First Time appeared Curl
Curl curl
Vendors & Products Curl
Curl curl

Sat, 17 Oct 2026 00:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in curl. This vulnerability can lead to information disclosure by inadvertently revealing authentication credentials. When curl retrieves credentials from a local configuration file (such as a .netrc file), requesting the effective URL metadata can cause the returned destination address to improperly include those secret credentials. A local user may exploit this issue to view sensitive authentication tokens if an application or script queries and logs or displays the resolved URL.
Title curl: curl: password leak in CURLINFO_EFFECTIVE_URL
Weaknesses CWE-522
References
Metrics threat_severity

None

 cvssV3_1

{'score': 3.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}

threat_severity

Low
cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-10-20T20:27:21.585Z

Updated: 2026-10-20T20:27:21.585Z

Reserved: 2026-09-21T09:07:46.185Z

Link: CVE-2026-94266

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-10-20T21:17:22.290

Modified: 2026-10-22T16:57:53.407

Link: CVE-2026-94266

cve-icon Redhat

Severity : Low

Publid Date: 2026-10-14T12:00:00Z

Links: CVE-2026-94266 - Bugzilla