CVE-2026-40701 (GCVE-0-2026-40701)

Vulnerability from cvelistv5 – Published: 2026-05-13 14:12 – Updated: 2026-05-13 16:07
VLAI
Title
NGINX ngx_http_ssl_module vulnerability
Summary
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.
Severity
4.8 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
6.3 (Medium)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-13 15:55 UTC
CWE
Assigner
f5 CNA under the mitre root
CNA scorecard B 84/100 over 87 records in the last 180 days details
References
URL Tags
https://my.f5.com/manage/s/article/K000161021 vendor-advisorypatch
Impacted products
Vendor Product Version CPE status
F5 NGINX Plus Unaffected: R37 , < * (custom)
Affected: R36 , < R36 P4 (custom)
Affected: R32 , < R32 P6 (custom)
guessed Create a notification for this product.
F5 NGINX Open Source Unaffected: 1.31.0 , < * (semver)
Affected: 1.19.0 , < 1.30.1 (semver)
guessed Create a notification for this product.
Date Public
2026-05-13 14:00
Credits
F5 acknowledges Zhenpeng (Leo) Lin of depthfirst for bringing this issue to our attention and following the highest standards of coordinated disclosure.
Show details on NVD website
To clipboard 

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              "vendor": "F5",
              "versions": [
                {
                  "lessThan": "*",
                  "status": "unaffected",
                  "version": "R37",
                  "versionType": "custom"
                },
                {
                  "lessThan": "R36 P4",
                  "status": "affected",
                  "version": "R36",
                  "versionType": "custom"
                },
                {
                  "lessThan": "R32 P6",
                  "status": "affected",
                  "version": "R32",
                  "versionType": "custom"
                }
              ]
            },
            {
              "defaultStatus": "unaffected",
              "modules": [
                "ngx_http_ssl_module"
              ],
              "product": "NGINX Open Source",
              "vendor": "F5",
              "versions": [
                {
                  "lessThan": "*",
                  "status": "unaffected",
                  "version": "1.31.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "1.30.1",
                  "status": "affected",
                  "version": "1.19.0",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "F5 acknowledges Zhenpeng (Leo) Lin of depthfirst for bringing this issue to our attention and following the highest standards of coordinated disclosure."
            }
          ],
          "datePublic": "2026-05-13T14:00:00.000Z",
          "descriptions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\n\n\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eNGINX Plus and NGINX Open Source have a vulnerability in the \u003c/span\u003e\u003cstrong\u003engx_http_ssl_module\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;module when the \u003c/span\u003e\u003cstrong\u003essl_verify_client\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;directive is set to \"on\" or \"optional,\" and the \u003c/span\u003e\u003cstrong\u003essl_ocsp\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;directive is set to \"on\" or the \u003c/span\u003e\u003cstrong\u003eleaf\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;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.\u003c/span\u003e\n\n\u003c/span\u003e\n\n\u0026nbsp;Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
                }
              ],
              "value": "NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_ssl_module\u00a0module when the ssl_verify_client\u00a0directive is set to \"on\" or \"optional,\" and the ssl_ocsp\u00a0directive is set to \"on\" or the leaf\u00a0parameters 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.\n\n\n\n\u00a0Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "attackComplexity": "HIGH",
                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 4.8,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L",
                "version": "3.1"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            },
            {
              "cvssV4_0": {
                "Automatable": "NOT_DEFINED",
                "Recovery": "NOT_DEFINED",
                "Safety": "NOT_DEFINED",
                "attackComplexity": "LOW",
                "attackRequirements": "PRESENT",
                "attackVector": "NETWORK",
                "baseScore": 6.3,
                "baseSeverity": "MEDIUM",
                "privilegesRequired": "NONE",
                "providerUrgency": "NOT_DEFINED",
                "subAvailabilityImpact": "NONE",
                "subConfidentialityImpact": "NONE",
                "subIntegrityImpact": "NONE",
                "userInteraction": "NONE",
                "valueDensity": "NOT_DEFINED",
                "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N",
                "version": "4.0",
                "vulnAvailabilityImpact": "LOW",
                "vulnConfidentialityImpact": "LOW",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
              },
              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
                }
              ]
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-416",
                  "description": "CWE-416 Use After Free",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-13T14:12:43.588Z",
            "orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
            "shortName": "f5"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory",
                "patch"
              ],
              "url": "https://my.f5.com/manage/s/article/K000161021"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "NGINX ngx_http_ssl_module vulnerability",
          "x_generator": {
            "engine": "F5 SIRTBot v1.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
        "assignerShortName": "f5",
        "cveId": "CVE-2026-40701",
        "datePublished": "2026-05-13T14:12:43.588Z",
        "dateReserved": "2026-04-30T23:04:27.950Z",
        "dateUpdated": "2026-05-13T16:07:37.463Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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