Use After Free Affecting nginx package, versions [1.19.0,1.30.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UNMANAGED-NGINX-16680099
- published14 May 2026
- disclosed13 May 2026
- creditZhenpeng (Leo) Lin
Introduced: 13 May 2026
CVE-2026-40701 (opens in a new tab)How to fix?
Upgrade nginx to version 1.30.1 or higher.
Overview
Affected versions of this package are vulnerable to Use After Free in the ngx_http_ssl_module process when the ssl_verify_client directive is set to "on" or "optional" and the ssl_ocsp directive is set to "on" or the leaf parameters are configured with a resolver. An attacker can cause the NGINX worker process to restart or modify limited data by sending crafted requests under these conditions. This is only exploitable if both ssl_verify_client is enabled ("on" or "optional") and ssl_ocsp is enabled or leaf parameters are configured with a resolver.