CVE-2026-65652

UNKNOWN 0.0

temporalio/tchannel-go malformed checksum type causes process termination

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-129
Vendor	temporal technologies, inc.
Product	temporalio/tchannel-go
Published	Sep 21, 2026

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Affected Versions

Temporal Technologies, Inc. / temporalio/tchannel-go

0.0.0-20160105034737-a6904155f628 < 1.22.1-0.20260720194454-0cb017f6870a

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/temporalio/tchannel-go/commit/a6904155f628b9e602b7bc88ef489004a786f7f4 github.com: https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80cc1881df0/reqres.go#L280-L295 github.com: https://github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7ab2d1d80cc1881df0/checksum.go#L29-L93 github.com: https://github.com/temporalio/tchannel-go/pull/14 github.com: https://github.com/temporalio/tchannel-go/commit/0cb017f6870a8420695abeb9a4560d39dadc4e2e github.com: https://github.com/temporalio/tchannel-go/tree/v1.22.1

Credits

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