Vulnerability · Published Sep 21, 2026 · Assigned by Temporal
CVE-2026-65652temporalio/tchannel-go malformed checksum type causes process termination
High 8.7
In plain English
A high-severity security flaw in temporalio/tchannel-go from Temporal Technologies, Inc.. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Temporal Technologies, Inc. | temporalio/tchannel-go | 0.0.0-20160105034737-a6904155f628 – before 1.22.1-0.20260720194454-0cb017f6870a |
Weakness: CWE-129 · 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
References
- First affected source revision product
- Vulnerable checksum-type parsing product
- Vulnerable checksum-pool access product
- Checksum-type validation fix patch
- First fixed source revision patch
- Fixed release tag v1.22.1 product