Improper Certificate Validation in cURL - CVE-2026-82208
Published: September 2, 2026
Vulnerability identifier: #VU146677
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-82208
CWE-ID: CWE-295
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to bypass certificate validation.
The vulnerability exists due to improper certificate validation in the wolfSSL backend when handling TLS connections after a CURLOPT_SSL_CTX_FUNCTION callback replaces the trust store. A remote attacker can present a certificate trusted by the cached store to bypass certificate validation.
This issue only affects libcurl builds that use the wolfSSL TLS backend with CA caching enabled and a CURLOPT_SSL_CTX_FUNCTION callback that replaces the trust store. The curl command line tool is not affected.
Affected software
cURL
How to mitigate CVE-2026-82208
Install security update from vendor's website.
cURL - update to 8.22.0