CVE-2026-82208

HIGH CVSS 3.1: 7.5 EPSS 0.43%
Updated Sep 15, 2026
Curl
Parameter Value
CVSS 7.5 (HIGH)
Affected Versions 8.9.1 — 8.22.0
Fixed In 8.22.0
Type CWE-295 (Improper Certificate Validation), CWE-295 Improper Certificate Validation
Vendor Curl
Public PoC No

With the wolfSSL backend, when CA caching is enabled and an `CURLOPT_SSL_CTX_FUNCTION` callback replaces the trust store, libcurl can silently reinstall the cached store after the callback returns. A certificate trusted by the cached store but rejected by the callback-selected store is then incorrectly accepted.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption

CVSS Vector v3.1

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Haxx Curl
cpe:2.3:a:haxx:curl:*:*:*:*:*:*:*:*
8.9.1 8.22.0