Use-after-free in cURL - CVE-2026-80229
Published: September 2, 2026
Vulnerability identifier: #VU146682
CSH Severity: Low
CVSS v4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80229
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to use-after-free in libcurl multi interface connection reuse handling when performing transfers over pooled TLS connections with OpenSSL 3 providers. A remote user can trigger premature easy handle destruction during connection reuse to cause a denial of service.
This affects libcurl built with OpenSSL 3+ provider configurations and also impacts the curl command line tool.
Affected software
cURL
How to mitigate CVE-2026-80229
Install security update from vendor's website.
cURL - update to 8.22.0