CVE-2026-65653 (GCVE-0-2026-65653)

Vulnerability from cvelistv5 – Published: 2026-09-21 11:36 – Updated: 2026-09-21 15:28
VLAI
Title
temporalio/tchannel-go zero-chunk call fragment causes process termination
Summary
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.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-21 15:28 UTC
CWE
  • CWE-129 - Improper Validation of Array Index
Impacted products
Vendor Product Version CPE status
Temporal Technologies, Inc. temporalio/tchannel-go Affected: 0.0.0-20150531204735-8d8ca17342b3 , < 1.22.1-0.20260720194454-0cb017f6870a (semver)
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                  "value": "\u003cp\u003eUpgrade github.com/temporalio/tchannel-go to v1.22.1 or later. The fix rejects fragments containing no argument chunks before indexing the chunk slice.\u003c/p\u003e"
                }
              ],
              "value": "Upgrade github.com/temporalio/tchannel-go to v1.22.1 or later. The fix rejects fragments containing no argument chunks before indexing the chunk slice."
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "temporalio/tchannel-go zero-chunk call fragment causes process termination",
          "workarounds": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eRestrict TChannel listener access to trusted peers. Where supported by the embedding application, require mutually authenticated TLS so peers without a trusted client certificate are rejected before TChannel frame parsing. External panic-recovery middleware is not a reliable mitigation because the confirmed inbound panic occurs on a library-created dispatch goroutine.\u003c/p\u003e"
                }
              ],
              "value": "Restrict TChannel listener access to trusted peers. Where supported by the embedding application, require mutually authenticated TLS so peers without a trusted client certificate are rejected before TChannel frame parsing. External panic-recovery middleware is not a reliable mitigation because the confirmed inbound panic occurs on a library-created dispatch goroutine."
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "61241ed8-fa44-4f23-92db-b8c443751968",
        "assignerShortName": "Temporal",
        "cveId": "CVE-2026-65653",
        "datePublished": "2026-09-21T11:36:47.095Z",
        "dateReserved": "2026-07-22T18:08:48.925Z",
        "dateUpdated": "2026-09-21T15:28:21.825Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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Detection rules are retrieved from Rulezet.

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Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


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