Vulnerability DatabaseCVE-2026-11564
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CVE-2026-11564
Published:July 03, 2026
Updated:July 21, 2026
libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches that same handle to custom CA material for a later transfer.
Affected Packages
https://github.com/curl/curl.git (GITHUB):
Affected version(s) >=curl-8_17_0 <curl-8_21_0
Fix Suggestion:
Update to version curl-8_21_0
Related Resources (3)
https://curl.se/docs/CVE-2026-11564.html
https://hackerone.com/reports/3788984
https://curl.se/docs/CVE-2026-11564.json
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CVSS v4
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.1
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
NONE
Weakness Type (CWE)
Improper Certificate Validation
CWE-295
EPSS
Base Score:
0.61