{"id":"CVE-2026-90439","state":"PUBLISHED","title":"NGINX ngx_http_v3_module vulnerability","description":"NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-deterministic manner that is beyond the attacker's control. This may cause a heap buffer overflow in the NGINX worker process leading to a restart and/or limited data corruption.\n\nImpact:\nThis vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or limited data corruption. 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":"2026-09-15T14:27:26.047Z","updatedAt":"2026-09-16T15:09:43.403Z","severity":{"score":6.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","source":"f5"},"assigner":"f5","products":["F5 NGINX Plus","F5 NGINX Open Source"],"affected":[{"vendor":"F5","product":"NGINX Plus","defaultStatus":"unknown","versions":[{"version":"37.1.0.1","status":"affected","lessThan":"37.1.1.2","versionType":"custom"},{"version":"37.0.0.1","status":"affected","lessThan":"37.0.6.2","versionType":"custom"}],"modules":["ngx_http_v3_module"]},{"vendor":"F5","product":"NGINX Open Source","defaultStatus":"unaffected","versions":[{"version":"1.29.2","status":"affected","lessThan":"1.31.6","versionType":"semver"},{"version":"1.30.4","status":"affected","lessThan":"1.30.5","versionType":"semver"}],"modules":["ngx_http_v3_module"]}],"references":["https://my.f5.com/manage/s/article/K000162604"],"weaknesses":["CWE-122"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90439.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90439","state":"PUBLISHED","datePublished":"2026-09-15T14:27:26.047Z","dateUpdated":"2026-09-16T15:09:43.403Z","assignerShortName":"f5","assignerOrgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","dateReserved":"2026-09-11T20:40:55.486Z"},"containers":{"cna":{"title":"NGINX ngx_http_v3_module vulnerability","descriptions":[{"lang":"en","value":"NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_v3_module module. When using HTTP/3 with OpenSSL versions <= OpenSSL 3.5.0 under certain configurations, a limited heap buffer overflow could happen while processing a TLS handshake. This can happen in a non-deterministic manner that is beyond the attacker's control. This may cause a heap buffer overflow in the NGINX worker process leading to a restart and/or limited data corruption.\n\nImpact:\nThis vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system or limited data corruption. 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 Plus","defaultStatus":"unknown","versions":[{"version":"37.1.0.1","status":"affected","lessThan":"37.1.1.2","versionType":"custom"},{"version":"37.0.0.1","status":"affected","lessThan":"37.0.6.2","versionType":"custom"}],"modules":["ngx_http_v3_module"]},{"vendor":"F5","product":"NGINX Open Source","defaultStatus":"unaffected","versions":[{"version":"1.29.2","status":"affected","lessThan":"1.31.6","versionType":"semver"},{"version":"1.30.4","status":"affected","lessThan":"1.30.5","versionType":"semver"}],"modules":["ngx_http_v3_module"]}],"references":[{"url":"https://my.f5.com/manage/s/article/K000162604","tags":["vendor-advisory"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/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":"NONE","attackVector":"NETWORK","baseScore":6.9,"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:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnerabilityResponseEffort":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-122","description":"CWE-122 Heap-based Buffer Overflow","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"f5","orgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","dateUpdated":"2026-09-16T15:09:43.403Z"},"credits":[{"lang":"en","type":"reporter","value":"F5 acknowledges Banny Liao for bringing this issue to our attention and following the highest standards of coordinated disclosure."}],"datePublic":"2026-09-15T14:00:00.000Z","impacts":[{"capecId":"CAPEC-100","descriptions":[{"lang":"en","value":"CAPEC-100 Overflow Buffers"}]}],"source":{"discovery":"EXTERNAL"},"workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"Disable HTTP/3 by removing \"quic\" from the \"listen\" directive. <br>Alternatively, enable HTTP/3 by adding \"quic\" to all configured server blocks.<br><br>"}],"value":"Disable HTTP/3 by removing \"quic\" from the \"listen\" directive. \nAlternatively, enable HTTP/3 by adding \"quic\" to all configured server blocks."}],"x_generator":{"engine":"F5 SIRTBot v1.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-15T14:48:56.965070Z","id":"CVE-2026-90439","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":"2026-09-15T14:49:03.305Z"}}]}}}