Riskcovery

CVE-2026-40701

NGINX ngx_http_ssl_module vulnerability

State
Published
Severity
6.3 Medium
Published
May 13, 2026
Updated
May 13, 2026
Reserved
Apr 30, 2026

Read the record on cve.org

Description

NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssl_module module 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. With this configuration, an unauthenticated attacker can send requests along with conditions beyond its control that may cause a heap-use-after-free error in the NGINX worker process. This vulnerability may result in limited modification of data or the NGINX worker process restarting.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Scores

CVSSScoreVectorSource
4.06.3 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:Nf5
3.14.8 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:Lf5

Weaknesses

Affected Products

ProductVersions
NGINX PlusF5
  • R37 and laterNot affected
  • R36 to before R36 P4Affected
  • R32 to before R32 P6Affected
NGINX Open SourceF5
  • 1.31.0 and laterNot affected
  • 1.19.0 to before 1.30.1Affected

References

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