CVE-2026-8286

wrong STARTTLS connection reuse

Published Jul 3, 2026 CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Debian DSA Debian DSA DSA-6558-1 curl security update
Ubuntu USN Ubuntu USN USN-8487-1 curl vulnerabilities
History
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'}

Type Values Removed Values Added
Weaknesses CWE-703
Type Values Removed Values Added
Weaknesses CWE-703
Type Values Removed Values Added
Weaknesses CWE-284
CWE-295
Type Values Removed Values Added
Weaknesses CWE-284
CWE-295
Type Values Removed Values Added
Weaknesses CWE-200
CWE-311
Type Values Removed Values Added
Weaknesses CWE-200
CWE-311
Type Values Removed Values Added
First Time appeared Curl
Curl curl
Vendors & Products Curl
Curl curl
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
Weaknesses

Sources

Status
PUBLISHED
Assigner
curl
Published
Updated
Sep 15, 2026, 6:03 AM
Reserved
May 11, 2026, 7:06 AM
Status
Modified
Published
Jul 3, 2026, 7:16 AM
Modified
Sep 15, 2026, 7:16 AM
Severity
Important
Public date
Jul 3, 2026, 6:14 AM