{"id":"CVE-2026-77762","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-77762","generatedAt":"2026-10-28T04:33:51.452Z","title":"Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat allows an attacker to inject trailer fields into another HTTP/2 request.","description":"Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat allows an attacker to inject trailer fields into another HTTP/2 request.\n\n\n\nThis issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.39 through 9.0.121.\n\n\n\nThe following versions were EOL at the time the CVE was created but are \nknown to be affected: from 8.5.59 through 8.5.100. Other unsupported versions may also be affected.\n\n\n\n\nUsers are recommended to upgrade to version 11.0.26, 10.1.60, 9.0.122, which fix the issue.","published":"2026-09-23T12:17:07.000Z","lastModified":"2026-09-30T15:22:35.000Z","status":"Awaiting Analysis","sourceIdentifier":"security@apache.org","cvss":{"version":"3.1","score":8.1,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-362"],"affected":[],"epss":{"score":0.00464,"percentile":0.40023,"date":"2026-10-27","history":[{"date":"2026-09-24","score":0.00361,"percentile":0.27089}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.46%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"scored","label":"Newly scored","at":"2026-09-23T16:45:12.000Z","detail":{"from":null,"score":"8.1","severity":"HIGH","fromSeverity":null},"summary":"Now scored CVSS 8.1 HIGH."},{"kind":"new","label":"New CVE","at":"2026-09-23T12:17:07.000Z","detail":{"score":null,"severity":null,"publishedAt":"2026-09-23T12:17:06.800Z"},"summary":"New CVE, high severity (CVSS 8.1)."}],"references":[{"url":"https://lists.apache.org/thread/y5r9fvjo7ol24mkoyoc0st8bqrfyqcyn","source":"security@apache.org"},{"url":"http://www.openwall.com/lists/oss-security/2026/09/23/23","source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-77762","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}