{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-49854","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-01T22:03:19.640Z","datePublished":"2026-07-14T20:43:03.977Z","dateUpdated":"2026-07-15T13:26:39.749Z"},"containers":{"cna":{"title":"Tornado: Out-of-bounds memory access in C extension","problemTypes":[{"descriptions":[{"cweId":"CWE-126","lang":"en","description":"CWE-126: Buffer Over-read","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}}],"references":[{"name":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-cx3h-4qpv-8hc9","tags":["x_refsource_CONFIRM"],"url":"https://github.com/tornadoweb/tornado/security/advisories/GHSA-cx3h-4qpv-8hc9"},{"name":"https://github.com/tornadoweb/tornado/pull/3626","tags":["x_refsource_MISC"],"url":"https://github.com/tornadoweb/tornado/pull/3626"},{"name":"https://github.com/tornadoweb/tornado/commit/96dc88c2a05705287856b2cd6b4b4034f9a6aaac","tags":["x_refsource_MISC"],"url":"https://github.com/tornadoweb/tornado/commit/96dc88c2a05705287856b2cd6b4b4034f9a6aaac"},{"name":"https://github.com/tornadoweb/tornado/releases/tag/v6.5.6","tags":["x_refsource_MISC"],"url":"https://github.com/tornadoweb/tornado/releases/tag/v6.5.6"}],"affected":[{"vendor":"tornadoweb","product":"tornado","versions":[{"version":"< 6.5.6","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-07-14T20:43:03.977Z"},"descriptions":[{"lang":"en","value":"Tornado is a Python web framework and asynchronous networking library. Prior to 6.5.6, the optional native extension tornado.speedups implemented websocket_mask without validating that the mask argument is exactly four bytes, allowing the C function to read up to three bytes beyond the provided buffer when reached through Tornado XSRF token decoding with the native extension active. This issue is fixed in version 6.5.6."}],"source":{"advisory":"GHSA-cx3h-4qpv-8hc9","discovery":"UNKNOWN"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-15T13:23:13.452445Z","id":"CVE-2026-49854","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"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":"2026-07-15T13:26:39.749Z"}}]}}