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CVE-2026-65652

temporalio/tchannel-go malformed checksum type causes process termination

CVSS 4.0 8.7 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-65652

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-65652

Published

github.com/temporalio/tchannel-go

https://pkg.go.dev

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Temporal Technologies, Inc.",
                    "product": "temporalio/tchannel-go",
                    "collectionURL": "https://pkg.go.dev",
                    "packageName": "github.com/temporalio/tchannel-go",
                    "repo": "https://github.com/temporalio/tchannel-go",
                    "modules": [
                        "Checksum",
                        "Frame parser"
                    ],
                    "programFiles": [
                        "checksum.go",
                        "reqres.go",
                        "inbound.go"
                    ],
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0.0.0-20160105034737-a6904155f628",
                            "lessThan": "1.22.1-0.20260720194454-0cb017f6870a",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON