{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-48142","assignerOrgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","state":"PUBLISHED","assignerShortName":"f5","dateReserved":"2026-06-02T21:45:04.856Z","datePublished":"2026-06-17T14:04:32.856Z","dateUpdated":"2026-06-17T15:42:56.704Z"},"containers":{"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","versionType":"custom"}]},{"defaultStatus":"unaffected","modules":["ngx_http_charset_module"],"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":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<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);\">&nbsp;module. When content is served or proxied through a location block with both </span><strong>source_charset</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;utf-8; and a </span><strong>charset</strong><span style=\"background-color: rgb(255, 255, 255);\">&nbsp;directive (for example, </span><strong>charset koi8-r</strong><span style=\"background-color: rgb(255, 255, 255);\">;) 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.</span> \n\n\nNote: 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 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. \n\n\nNote: 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":"HIGH","attackRequirements":"NONE","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:H/AT:N/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":{"orgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","shortName":"f5","dateUpdated":"2026-06-17T14:04:32.856Z"},"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"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-17T15:42:46.410409Z","id":"CVE-2026-48142","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-06-17T15:42:56.704Z"}}]}}