Vulnerability-Lookup

GHSA-2MHP-WPJP-PJR8

Vulnerability from github – Published: 2026-09-21 12:32 – Updated: 2026-09-21 12:32

Details

github.com/temporalio/tchannel-go did not validate the one-byte checksum-type field in inbound TChannel call frames. A network peer that can reach a listener can complete the standard initialization handshake and send a call request with an unsupported checksum type. The parser uses that value as an index into a four-entry checksum pool, causing an unrecovered Go panic on the connection read goroutine and terminating 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.

Severity

8.7 (High)


                  
                    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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-65652"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-129"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-21T12:17:15Z",
    "severity": "HIGH"
  },
  "details": "github.com/temporalio/tchannel-go did not validate the one-byte checksum-type field in inbound TChannel call frames. A network peer that can reach a listener can complete the standard initialization handshake and send a call request with an unsupported checksum type. The parser uses that value as an index into a four-entry checksum pool, causing an unrecovered Go panic on the connection read goroutine and terminating 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.",
  "id": "GHSA-2mhp-wpjp-pjr8",
  "modified": "2026-09-21T12:32:38Z",
  "published": "2026-09-21T12:32:38Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-65652"
    },
    {
      "type": "WEB",
      "url": "https://github.com/temporalio/tchannel-go/pull/14"
    },
    {
      "type": "WEB",
      "url": "https://github.com/temporalio/tchannel-go/commit/0cb017f6870a8420695abeb9a4560d39dadc4e2e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/temporalio/tchannel-go/commit/a6904155f628b9e602b7bc88ef489004a786f7f4"
    },
    {
      "type": "WEB",
      "url": "https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80cc1881df0/checksum.go#L29-L93"
    },
    {
      "type": "WEB",
      "url": "https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80cc1881df0/reqres.go#L280-L295"
    },
    {
      "type": "WEB",
      "url": "https://github.com/temporalio/tchannel-go/tree/v1.22.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-65652 (GCVE-0-2026-65652)

Vulnerability from cvelistv5 – Published: 2026-09-21 11:35 – Updated: 2026-09-21 15:30

Title

temporalio/tchannel-go malformed checksum type causes process termination

Summary

Severity

8.7 (High)


                        
                          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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-21 15:29 UTC

CWE

CWE-129 - Improper Validation of Array Index

Assigner

Temporal mitre root

References

6 references

URL	Tags
https://github.com/temporalio/tchannel-go/commit/…	product
https://github.com/temporalio/tchannel-go/blob/87…	product
https://github.com/temporalio/tchannel-go/blob/87…	product
https://github.com/temporalio/tchannel-go/pull/14	patch
https://github.com/temporalio/tchannel-go/commit/…	patch
https://github.com/temporalio/tchannel-go/tree/v1.22.1	product

Impacted products

1 product

Vendor	Product	Version
Temporal Technologies, Inc.	temporalio/tchannel-go	Affected: 0.0.0-20160105034737-a6904155f628 , < 1.22.1-0.20260720194454-0cb017f6870a (semver)

Credits

An external security researcher who reported this issue responsibly to Temporal Technologies

Show details on NVD website

JSON

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                "id": "CVE-2026-65652",
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                    "Technical Impact": "partial"
                  }
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                "role": "CISA Coordinator",
                "timestamp": "2026-09-21T15:29:36.927700Z",
                "version": "2.0.3"
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              "type": "ssvc"
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          "dateUpdated": "2026-09-21T15:30:00.325Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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          "packageName": "github.com/temporalio/tchannel-go",
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            "checksum.go",
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          "vendor": "Temporal Technologies, Inc.",
          "versions": [
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              "lessThan": "1.22.1-0.20260720194454-0cb017f6870a",
              "status": "affected",
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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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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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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GHSA-2MHP-WPJP-PJR8

CVE-2026-65652 (GCVE-0-2026-65652)

Tags

Sightings

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