A flaw in libcurl makes it wrongly reuse an existing HTTPS connection setup for a given hostname even when using a different Native CA Store setting (`CURLSSLOPT_NATIVE_CA`) than when the connection was created.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

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 partial

Affected Vendors & Products

Vendors Products
Curl
  • Curl
Haxx
  • Curl
Redhat
  • Hummingbird

Configuration 1 [-]

cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
Package CPE Advisory Released Date
Red Hat Hardened Images
curl-main-8.22.0-0.1.hum1 cpe:/a:redhat:hummingbird:1 RHSA-2026:63161 2026-09-03T00:00:00Z
References
Link Providers
https://curl.se/docs/CVE-2026-80231.html cve-icon cve-icon cve-icon
https://curl.se/docs/CVE-2026-80231.json cve-icon cve-icon cve-icon
https://hackerone.com/reports/3969368 cve-icon cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-80231 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-80231 cve-icon
History

Tue, 22 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
First Time appeared Redhat
Redhat hummingbird
Weaknesses CWE-295
CPEs cpe:/a:redhat:hummingbird:1
Vendors & Products Redhat
Redhat hummingbird
References
Metrics threat_severity

None

 threat_severity

Low

Fri, 11 Sep 2026 23:45:00 +0000

Type Values Removed Values Added
First Time appeared Haxx
Haxx curl
CPEs cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
Vendors & Products Haxx
Haxx curl

Thu, 10 Sep 2026 04:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-295

Tue, 08 Sep 2026 19:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-488
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

ssvc

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

Sun, 06 Sep 2026 20:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-295

Sun, 06 Sep 2026 19:45:00 +0000

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

Sun, 06 Sep 2026 18:00:00 +0000

Type Values Removed Values Added
Description A flaw in libcurl makes it wrongly reuse an existing HTTPS connection setup for a given hostname even when using a different Native CA Store setting (`CURLSSLOPT_NATIVE_CA`) than when the connection was created.
Title native CA store conn reuse
References
cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-09-06T17:48:38.062Z

Updated: 2026-09-15T06:03:11.962Z

Reserved: 2026-08-26T04:24:27.361Z

Link: CVE-2026-80231

cve-icon Vulnrichment

Updated: 2026-09-08T18:50:55.455Z

cve-icon NVD

Status : Modified

Published: 2026-09-06T18:17:22.500

Modified: 2026-09-15T07:16:30.570

Link: CVE-2026-80231

cve-icon Redhat

Severity : Low

Publid Date: 2026-09-06T17:48:38Z

Links: CVE-2026-80231 - Bugzilla