CVE-2026-48142 (GCVE-0-2026-48142)

Vulnerability from cvelistv5 – Published: 2026-06-17 14:04 – Updated: 2026-06-17 15:42 X_F5
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 content is served or proxied through a location block with both source_charset utf-8; and a charset directive (for example, charset koi8-r;) configured, remote, unauthenticated attackers can send requests (in conjunction with conditions beyond their 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:H/AT:N/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 2026-06-17 15:42 UTC
CWE
Assigner
f5 CNA under the mitre root
CNA scorecard B 84/100 over 87 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
F5 NGINX Open Source Affected: 1.13.10 , < 1.31.2 (custom)
Affected: 1.30.0 , < 1.30.3 (custom)
guessed Create a notification for this product.
F5 NGINX Plus Affected: 37.0 , < 37.0.2.1 (custom)
Affected: R36 , < R36 P6 (custom)
guessed Create a notification for this product.
Date Public
2026-06-17 14:00
Credits
"F5 acknowledges p4p3r of CYBERONE and Han Yan of Xiaomi 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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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "nginx: NGINX: Memory disclosure or denial of service via ngx_http_charset_module heap buffer over-read",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-48142.json",
      "version": "3"
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-16T00:19:11Z",
      "cve": "CVE-2026-48142",
      "id": "CVE-2026-48142",
      "initial_release_date": "2026-06-19T01:50:31Z",
      "product_status:known_affected": "24",
      "product_status:recommended": "46",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-48142",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-48142.json",
      "version": "8"
    },
    "vulnrichment": {
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          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-48142",
                    "options": [
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                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-06-17T15:42:46.410409Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-06-17T15:42:53.164Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unknown",
              "modules": [
                "ngx_http_charset_module"
              ],
              "product": "NGINX Open Source",
              "vendor": "F5",
              "versions": [
                {
                  "lessThan": "1.31.2",
                  "status": "affected",
                  "version": "1.13.10",
                  "versionType": "custom"
                },
                {
                  "lessThan": "1.30.3",
                  "status": "affected",
                  "version": "1.30.0",
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                }
              ]
            },
            {
              "defaultStatus": "unaffected",
              "modules": [
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              ],
              "product": "NGINX Plus",
              "vendor": "F5",
              "versions": [
                {
                  "lessThan": "37.0.2.1",
                  "status": "affected",
                  "version": "37.0",
                  "versionType": "custom"
                },
                {
                  "lessThan": "R36 P6",
                  "status": "affected",
                  "version": "R36",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "credits": [
            {
              "lang": "en",
              "type": "reporter",
              "value": "\"F5 acknowledges p4p3r of CYBERONE and Han Yan of Xiaomi for bringing this issue to our attention and following the highest standards of coordinated disclosure.\""
            }
          ],
          "datePublic": "2026-06-17T14:00:00.000Z",
          "descriptions": [
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              "lang": "en",
              "supportingMedia": [
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                  "base64": false,
                  "type": "text/html",
                  "value": "\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);\"\u003e\u0026nbsp;module. When content is served or proxied through a location block with both \u003c/span\u003e\u003cstrong\u003esource_charset\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;utf-8; and a \u003c/span\u003e\u003cstrong\u003echarset\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e\u0026nbsp;directive (for example, \u003c/span\u003e\u003cstrong\u003echarset koi8-r\u003c/strong\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003e;) configured, remote, unauthenticated attackers can send requests (in conjunction with conditions beyond their 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\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
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            }
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                "attackVector": "NETWORK",
                "availabilityImpact": "LOW",
                "baseScore": 4.8,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "LOW",
                "integrityImpact": "NONE",
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                "userInteraction": "NONE",
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                "Recovery": "NOT_DEFINED",
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                "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:H/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N",
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                "vulnAvailabilityImpact": "LOW",
                "vulnConfidentialityImpact": "LOW",
                "vulnIntegrityImpact": "NONE",
                "vulnerabilityResponseEffort": "NOT_DEFINED"
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              "format": "CVSS",
              "scenarios": [
                {
                  "lang": "en",
                  "value": "GENERAL"
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              ]
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          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-125",
                  "description": "CWE-125 Out-of-bounds Read",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-06-17T14:04:32.856Z",
            "orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
            "shortName": "f5"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://my.f5.com/manage/s/article/K000161585"
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "tags": [
            "x_F5"
          ],
          "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-2026-48142",
        "datePublished": "2026-06-17T14:04:32.856Z",
        "dateReserved": "2026-06-02T21:45:04.856Z",
        "dateUpdated": "2026-06-17T15:42:56.704Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

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