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    "cveMetadata": {
        "cveId": "CVE-2026-42934",
        "assignerOrgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
        "state": "PUBLISHED",
        "assignerShortName": "f5",
        "dateReserved": "2026-04-30T23:04:27.960Z",
        "datePublished": "2026-05-13T14:12:44.331Z",
        "dateUpdated": "2026-06-08T20:34:05.147Z"
    },
    "containers": {
        "cna": {
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                "orgId": "9dacffd4-cb11-413f-8451-fbbfd4ddc0ab",
                "shortName": "f5",
                "dateUpdated": "2026-06-08T20:34:05.147Z"
            },
            "title": "NGINX ngx_http_charset_module vulnerability",
            "datePublic": "2026-05-13T14:00:00.000Z",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "cweId": "CWE-125",
                            "description": "CWE-125 Out-of-bounds Read",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "vendor": "F5",
                    "product": "NGINX Plus",
                    "modules": [
                        "ngx_http_charset_module"
                    ],
                    "versions": [
                        {
                            "status": "unaffected",
                            "version": "R37",
                            "lessThan": "*",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "R36",
                            "lessThan": "R36 P4",
                            "versionType": "custom"
                        },
                        {
                            "status": "affected",
                            "version": "R32",
                            "lessThan": "R32 P6",
                            "versionType": "custom"
                        }
                    ],
                    "defaultStatus": "unknown"
                },
                {
                    "vendor": "F5",
                    "product": "NGINX Open Source",
                    "modules": [
                        "ngx_http_charset_module"
                    ],
                    "versions": [
                        {
                            "status": "unaffected",
                            "version": "1.31.0",
                            "lessThan": "*",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "0.3.50",
                            "lessThan": "1.30.1",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }
            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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.\n\n\n\n Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
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                            "value": "<span style=\"background-color: rgb(255, 255, 255);\">\n\n<span style=\"background-color: rgb(255, 255, 255);\">NGINX Plus and NGINX Open Source have a vulnerability in the </span><strong>ngx_http_charset_module </strong><span style=\"background-color: rgb(255, 255, 255);\">module. When </span><strong>charset</strong><span style=\"background-color: rgb(255, 255, 255);\">, </span><strong>source_charset</strong><span style=\"background-color: rgb(255, 255, 255);\">, and </span><strong>charset_map</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;and </span><strong>proxy_pass</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;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.</span>\n\n</span>\n\n&nbsp;Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://my.f5.com/manage/s/article/K000161028",
                    "tags": [
                        "vendor-advisory",
                        "patch"
                    ]
                }
            ],
            "metrics": [
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                    "format": "CVSS",
                    "scenarios": [
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                            "lang": "en",
                            "value": "GENERAL"
                        }
                    ],
                    "cvssV3_1": {
                        "version": "3.1",
                        "attackVector": "NETWORK",
                        "attackComplexity": "HIGH",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "scope": "UNCHANGED",
                        "confidentialityImpact": "LOW",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "LOW",
                        "baseSeverity": "MEDIUM",
                        "baseScore": 4.8,
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L"
                    }
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                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "PRESENT",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "LOW",
                        "subConfidentialityImpact": "NONE",
                        "vulnIntegrityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "LOW",
                        "subAvailabilityImpact": "NONE",
                        "Safety": "NOT_DEFINED",
                        "Automatable": "NOT_DEFINED",
                        "Recovery": "NOT_DEFINED",
                        "valueDensity": "NOT_DEFINED",
                        "vulnerabilityResponseEffort": "NOT_DEFINED",
                        "providerUrgency": "NOT_DEFINED",
                        "baseSeverity": "MEDIUM",
                        "baseScore": 6.3,
                        "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"
                    }
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "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.",
                    "type": "finder"
                }
            ],
            "source": {
                "discovery": "EXTERNAL"
            },
            "x_generator": {
                "engine": "F5 SIRTBot v1.0"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-05-13T15:55:18.483975Z",
                                "id": "CVE-2026-42934",
                                "options": [
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                                        "Exploitation": "none"
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                                        "Automatable": "no"
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                                        "Technical Impact": "partial"
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                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
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                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-05-13T16:07:10.334Z"
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}