A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable no

Technical Impact total

Affected Vendors & Products

Vendors Products
Curl
  • Curl

No data.

No data.

References
Link Providers
https://curl.se/docs/CVE-2026-8286.html cve-icon cve-icon
https://curl.se/docs/CVE-2026-8286.json cve-icon cve-icon
https://hackerone.com/reports/3718195 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-8286 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-8286 cve-icon
History

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

Type Values Removed Values Added
Weaknesses CWE-295
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': 8.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

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

Type Values Removed Values Added
Weaknesses CWE-703

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

Type Values Removed Values Added
Weaknesses CWE-703

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

Type Values Removed Values Added
Weaknesses CWE-284
CWE-295

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

Type Values Removed Values Added
Weaknesses CWE-284
CWE-295

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

Type Values Removed Values Added
Weaknesses CWE-200
CWE-311

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

Type Values Removed Values Added
Weaknesses CWE-200
CWE-311

Fri, 03 Jul 2026 09:00:00 +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 A vulnerability exists where a new transfer that uses STARTTLS to upgrade the connection might reuse an existing live connection even though the TLS configuration mismatches so it should not.
Title wrong STARTTLS connection reuse
References
cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-07-03T06:14:17.541Z

Updated: 2026-07-06T17:33:50.416Z

Reserved: 2026-05-11T07:06:37.906Z

Link: CVE-2026-8286

cve-icon Vulnrichment

Updated: 2026-07-06T17:33:45.469Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Important

Publid Date: 2026-07-03T06:14:17Z

Links: CVE-2026-8286 - Bugzilla