{"id":"CVE-2026-65653","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-65653","generatedAt":"2026-10-27T23:57:04.714Z","title":"This allows remote denial of service against applications that expose the listener to untrusted peers.","description":"github.com/temporalio/tchannel-go did not reject TChannel call fragments containing checksum metadata but no length-prefixed argument chunks. The fragment reader left its chunk slice empty and then unconditionally selected the first element. A network peer can supply such a malformed call fragment, including as a direct initial call request after completing the standard initialization handshake. On that inbound path, the resulting unrecovered Go slice-bounds panic occurs on a library-created dispatch goroutine and terminates the hosting process. This allows remote denial of service against applications that expose the listener to untrusted peers. The impact is limited to availability; no confidentiality or integrity impact was identified.","published":"2026-09-21T12:17:16.000Z","lastModified":"2026-09-22T19:40:06.000Z","status":"Awaiting Analysis","sourceIdentifier":"security@temporal.io","cvss":{"version":"4.0","score":8.7,"severity":"HIGH","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-129"],"affected":[],"epss":{"score":0.0071,"percentile":0.53243,"date":"2026-10-26","history":[{"date":"2026-09-22","score":0.00679,"percentile":0.50948}]},"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 (0.71%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-21T12:17:16.000Z","detail":{"score":"8.7","severity":"HIGH","publishedAt":"2026-09-21T12:17:15.973Z"},"summary":"New CVE, high severity (CVSS 8.7)."}],"references":[{"url":"https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80cc1881df0/fragmenting_reader.go#L256-L308","source":"security@temporal.io"},{"url":"https://github.com/temporalio/tchannel-go/commit/0cb017f6870a8420695abeb9a4560d39dadc4e2e","source":"security@temporal.io"},{"url":"https://github.com/temporalio/tchannel-go/commit/1dcfa67262ecd56a24f12940f4082549190cb5d1","source":"security@temporal.io"},{"url":"https://github.com/temporalio/tchannel-go/commit/8d8ca17342b3620d3a6d5c1a825145595e7588ff","source":"security@temporal.io"},{"url":"https://github.com/temporalio/tchannel-go/pull/14","source":"security@temporal.io"},{"url":"https://github.com/temporalio/tchannel-go/tree/v1.22.1","source":"security@temporal.io"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-65653","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."}