{"id":"CVE-2026-78222","state":"PUBLISHED","title":"NGINX ngx_http_js_module vulnerability","description":"A vulnerability exists in NGINX JavaScript where a malformed HTTP response received by ngx.fetch() can crash an NGINX worker when trusted JavaScript reads Response.statusText. Exploitation requires control or influence over the fetched HTTP response.\n\nImpact:\nThis vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system. There is no control plane exposure; this is a data plane issue only.\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","publishedAt":"2026-09-02T15:40:55.467Z","updatedAt":"2026-09-02T17:59:40.463Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"f5"},"assigner":"f5","products":["F5 NGINX JavaScript"],"affected":[{"vendor":"F5","product":"NGINX JavaScript","defaultStatus":"unknown","versions":[{"version":"0.5.1","status":"affected","lessThan":"1.0.1","versionType":"custom"}],"modules":["ngx_http_js_module"]}],"references":["https://my.f5.com/manage/s/article/K000162603"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/78xxx/CVE-2026-78222.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-78222","state":"PUBLISHED","datePublished":"2026-09-02T15:40:55.467Z","dateUpdated":"2026-09-02T17:59:40.463Z","assignerShortName":"f5","assignerOrgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","dateReserved":"2026-08-25T23:21:14.556Z"},"containers":{"cna":{"title":"NGINX ngx_http_js_module vulnerability","descriptions":[{"lang":"en","value":"A vulnerability exists in NGINX JavaScript where a malformed HTTP response received by ngx.fetch() can crash an NGINX worker when trusted JavaScript reads Response.statusText. Exploitation requires control or influence over the fetched HTTP response.\n\nImpact:\nThis vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system. There is no control plane exposure; this is a data plane issue only.\n\n\n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}],"affected":[{"vendor":"F5","product":"NGINX JavaScript","defaultStatus":"unknown","versions":[{"version":"0.5.1","status":"affected","lessThan":"1.0.1","versionType":"custom"}],"modules":["ngx_http_js_module"]}],"references":[{"url":"https://my.f5.com/manage/s/article/K000162603","tags":["vendor-advisory"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]},{"cvssV4_0":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"NONE","attackVector":"NETWORK","baseScore":8.7,"baseSeverity":"HIGH","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:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"HIGH","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","description":"CWE-476 NULL Pointer Dereference","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"f5","orgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","dateUpdated":"2026-09-02T15:40:55.467Z"},"credits":[{"lang":"en","type":"reporter","value":"F5 acknowledges Sujal Tuladhar (EvilGenius) and YuuLuo for bringing this issue to our attention and following the highest standards of coordinated disclosure."}],"datePublic":"2026-09-02T14:00:00.000Z","source":{"discovery":"EXTERNAL"},"workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Restrict ngx.fetch() destinations to trusted servers and avoid reading Response.statusText for responses from attacker-controlled or attacker-influenced endpoints. <br>Using HTTPS with certificate verification reduces exposure to network-based response manipulation but does not protect against a malicious or compromised fetched server<br>"}],"value":"Restrict ngx.fetch() destinations to trusted servers and avoid reading Response.statusText for responses from attacker-controlled or attacker-influenced endpoints. \nUsing HTTPS with certificate verification reduces exposure to network-based response manipulation but does not protect against a malicious or compromised fetched server"}],"x_generator":{"engine":"F5 SIRTBot v1.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-02T17:59:30.733424Z","id":"CVE-2026-78222","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-02T17:59:40.463Z"}}]}}}