High 8.7Published Sep 21, 2026

CVE-2026-65652temporalio/tchannel-go malformed checksum type causes process termination

Updated under an hour ago (2026-10-19 09:30 UTC)

Does this affect you?

It affects Temporal Technologies, Inc. temporalio/tchannel-go. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Temporal Technologies, Inc. temporalio/tchannel-go

Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-129
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Temporal
NVD analysis: Awaiting Analysis
Record last updated: Sep 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Temporal Technologies, Inc. temporalio/tchannel-go temporal_technologies:temporalio_tchannel_go (from the name)	from 0.0.0-20160105034737-a6904155f628 before 1.22.1-0.20260720194454-0cb017f6870a	CNA record

References

https://github.com/temporalio/tchannel-go/commit/a6904155f628b9e602b7bc88ef489004a786f7f4product
https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80cc1881df0/reqres.go#L280-L295product
https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80cc1881df0/checksum.go#L29-L93product
https://github.com/temporalio/tchannel-go/pull/14patch
https://github.com/temporalio/tchannel-go/commit/0cb017f6870a8420695abeb9a4560d39dadc4e2epatch
https://github.com/temporalio/tchannel-go/tree/v1.22.1product

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.