{"id":"CVE-2026-42926","state":"PUBLISHED","title":"NGINX ngx_http_proxy_v2_module vulnerability","description":"When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.","publishedAt":"2026-05-13T14:12:45.695Z","updatedAt":"2026-05-13T16:16:54.456Z","severity":{"score":6.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N","source":"f5"},"assigner":"f5","products":["F5 NGINX Open Source"],"affected":[{"vendor":"F5","product":"NGINX Open Source","defaultStatus":"unaffected","versions":[{"version":"1.31.0","status":"unaffected","lessThan":"*","versionType":"semver"},{"version":"1.29.4","status":"affected","lessThan":"1.30.1","versionType":"semver"}],"modules":["ngx_http_proxy_v2_module"]}],"references":["https://my.f5.com/manage/s/article/K000161131"],"weaknesses":["CWE-172"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/42xxx/CVE-2026-42926.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-42926","state":"PUBLISHED","datePublished":"2026-05-13T14:12:45.695Z","dateUpdated":"2026-05-13T16:16:54.456Z","assignerShortName":"f5","assignerOrgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","dateReserved":"2026-05-05T21:19:09.531Z"},"containers":{"cna":{"title":"NGINX ngx_http_proxy_v2_module vulnerability","descriptions":[{"lang":"en","value":"When NGINX Open Source is configured to proxy HTTP/2 traffic by setting proxy_http_version to 2, and also uses proxy_set_body, an attacker may be able to inject frame headers and payload bytes to the upstream peer.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated."}],"affected":[{"vendor":"F5","product":"NGINX Open Source","defaultStatus":"unaffected","versions":[{"version":"1.31.0","status":"unaffected","lessThan":"*","versionType":"semver"},{"version":"1.29.4","status":"affected","lessThan":"1.30.1","versionType":"semver"}],"modules":["ngx_http_proxy_v2_module"]}],"references":[{"url":"https://my.f5.com/manage/s/article/K000161131","tags":["vendor-advisory","patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE","baseSeverity":"MEDIUM","baseScore":5.8,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"version":"4.0","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","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:N/VI:N/VA:N/SC:N/SI:L/SA:N"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-172","lang":"en","description":"CWE-172 Encoding Error","type":"CWE"}]}],"providerMetadata":{"shortName":"f5","orgId":"9dacffd4-cb11-413f-8451-fbbfd4ddc0ab","dateUpdated":"2026-05-13T16:16:54.456Z"},"datePublic":"2026-05-13T14:00:00.000Z","credits":[{"lang":"en","value":"F5 acknowledges Mufeed VH of Winfunc Research, Hcamael of aipyaipy, and 章鱼哥 of aipyaipy for bringing this issue to our attention and following the highest standards of coordinated disclosure.","type":"reporter"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"F5 SIRTBot v1.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-13T15:54:52.773305Z","id":"CVE-2026-42926","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":"2026-05-13T16:06:30.263Z"}}]}}}