CVE-2026-42934 (GCVE-0-2026-42934)

Vulnerability from cvelistv5 – Published: 2026-05-13 14:12 – Updated: 2026-06-08 20:34
VLAI
Title
NGINX ngx_http_charset_module vulnerability
Summary
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_charset_module module. When charset, source_charset, and charset_map and proxy_pass with disabled buffering ("off") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers' control to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart.  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/K000161028 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: 0.3.50 , < 1.30.1 (semver)
guessed Create a notification for this product.
Date Public
2026-05-13 14:00
Credits
F5 acknowledges David Carlier, Zhenpeng (Leo) Lin of depthfirst, and GAO Liyou 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_charset_module"
              ],
              "product": "NGINX Open Source",
              "vendor": "F5",
              "versions": [
                {
                  "lessThan": "*",
                  "status": "unaffected",
                  "version": "1.31.0",
                  "versionType": "semver"
                },
                {
                  "lessThan": "1.30.1",
                  "status": "affected",
                  "version": "0.3.50",
                  "versionType": "semver"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "finder",
              "value": "F5 acknowledges David Carlier, Zhenpeng (Leo) Lin of depthfirst, and GAO Liyou 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_charset_module \u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003emodule. When \u003c/span\u003e\u003cstrong\u003echarset\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e, \u003c/span\u003e\u003cstrong\u003esource_charset\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e, and \u003c/span\u003e\u003cstrong\u003echarset_map\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;and \u003c/span\u003e\u003cstrong\u003eproxy_pass\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;with disabled buffering (\"off\") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers\u0027 control to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart.\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_charset_module module. When charset, source_charset, and charset_map\u00a0and proxy_pass\u00a0with disabled buffering (\"off\") directives are configured, unauthenticated attackers can send requests that with conditions beyond the attackers\u0027 control to cause a heap buffer over-read in the NGINX worker process, leading to limited disclosure of memory or a restart.\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-125",
                  "description": "CWE-125 Out-of-bounds Read",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-06-08T20:34:05.147Z",
            "orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
            "shortName": "f5"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory",
                "patch"
              ],
              "url": "https://my.f5.com/manage/s/article/K000161028"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "NGINX ngx_http_charset_module vulnerability",
          "x_generator": {
            "engine": "F5 SIRTBot v1.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
        "assignerShortName": "f5",
        "cveId": "CVE-2026-42934",
        "datePublished": "2026-05-13T14:12:44.331Z",
        "dateReserved": "2026-04-30T23:04:27.960Z",
        "dateUpdated": "2026-06-08T20:34:05.147Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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