CVE-2026-42946 (GCVE-0-2026-42946)

Vulnerability from cvelistv5 – Published: 2026-05-13 14:12 – Updated: 2026-05-13 16:06
VLAI
Title
NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability
Summary
A vulnerability exists in the ngx_http_scgi_module and ngx_http_uwsgi_module modules that may result in excessive memory allocation or an over-read of data. When scgi_pass or uwsgi_pass is configured, an unauthenticated attacker with man-in-the-middle (MITM) ability to control responses from an upstream server may be able to read the memory of the NGINX worker process or restart it.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Severity
6.5 (Medium)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:L
8.3 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/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
  • CWE-789 - Memory Allocation with Excessive Size Value
  • CWE-823 - Use of Out-of-range Pointer Offset
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/K000161027 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: 0.8.42 , < 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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              {
                "other": {
                  "content": {
                    "id": "CVE-2026-42946",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
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                      }
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                    "timestamp": "2026-05-13T15:55:04.864917Z",
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
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        ],
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          "affected": [
            {
              "defaultStatus": "unknown",
              "modules": [
                "ngx_http_scgi_module and ngx_http_uwsgi_module"
              ],
              "product": "NGINX Plus",
              "vendor": "F5",
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                  "status": "unaffected",
                  "version": "R37",
                  "versionType": "custom"
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                  "version": "1.31.0",
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            {
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              "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."
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          "datePublic": "2026-05-13T14:00:00.000Z",
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                "baseSeverity": "HIGH",
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                "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "format": "CVSS",
              "scenarios": [
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                  "value": "GENERAL"
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              ]
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          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-789",
                  "description": "CWE-789: Memory Allocation with Excessive Size Value",
                  "lang": "en",
                  "type": "CWE"
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              ]
            },
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              "descriptions": [
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                  "cweId": "CWE-823",
                  "description": "CWE-823: Use of Out-of-range Pointer Offset",
                  "lang": "en",
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          "providerMetadata": {
            "dateUpdated": "2026-05-13T14:12:44.697Z",
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              "url": "https://my.f5.com/manage/s/article/K000161027"
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          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "NGINX ngx_http_scgi_module and ngx_http_uwsgi_module vulnerability",
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          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
        "assignerShortName": "f5",
        "cveId": "CVE-2026-42946",
        "datePublished": "2026-05-13T14:12:44.697Z",
        "dateReserved": "2026-04-30T23:04:27.965Z",
        "dateUpdated": "2026-05-13T16:06:56.898Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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