libcurl had a flaw that when instructed to clear proxy authentication credentials which made it not do so, leaving the old credentials around to get used for subsequent transfers that should not know nor use them.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable yes

Technical Impact total

Affected Vendors & Products

Vendors Products
Curl
  • Curl

No data.

No data.

References
Link Providers
https://curl.se/docs/CVE-2026-9079.html cve-icon cve-icon
https://curl.se/docs/CVE-2026-9079.json cve-icon cve-icon
https://hackerone.com/reports/3750295 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-9079 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-9079 cve-icon
History

Tue, 07 Jul 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-212
References
Metrics threat_severity

None

 threat_severity

Important

Mon, 06 Jul 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Mon, 06 Jul 2026 13:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-255

Sun, 05 Jul 2026 17:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-255

Sun, 05 Jul 2026 05:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-256
CWE-322

Sat, 04 Jul 2026 17:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-256
CWE-322

Sat, 04 Jul 2026 12:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-200
CWE-269

Sat, 04 Jul 2026 05:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-200
CWE-269

Fri, 03 Jul 2026 21:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-285
CWE-287

Fri, 03 Jul 2026 10:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-285
CWE-287

Fri, 03 Jul 2026 08:00:00 +0000

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

Fri, 03 Jul 2026 06:45:00 +0000

Type Values Removed Values Added
Description libcurl had a flaw that when instructed to clear proxy authentication credentials which made it not do so, leaving the old credentials around to get used for subsequent transfers that should not know nor use them.
Title stale proxy password leak
References
cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-07-03T06:16:51.127Z

Updated: 2026-07-06T16:49:56.248Z

Reserved: 2026-05-20T12:59:41.444Z

Link: CVE-2026-9079

cve-icon Vulnrichment

Updated: 2026-07-06T16:49:51.324Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Important

Publid Date: 2026-07-03T06:16:51Z

Links: CVE-2026-9079 - Bugzilla