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Vendor Solution
Upgrade github.com/temporalio/tchannel-go to v1.22.1 or later. The fix rejects unsupported checksum types during direct and relay frame parsing and prevents out-of-range checksum-pool access.
Vendor Workaround
Restrict TChannel listener access to trusted peers. Where supported by the embedding application, require mutually authenticated TLS so peers without a trusted client certificate are rejected before TChannel frame parsing. External panic-recovery middleware is not a reliable mitigation because the panic occurs on a library-created connection goroutine.
Tracking
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Mon, 21 Sep 2026 16:30:00 +0000
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Mon, 21 Sep 2026 11:45:00 +0000
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| 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. | |
| Title | temporalio/tchannel-go malformed checksum type causes process termination | |
| Weaknesses | CWE-129 | |
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| Metrics |
cvssV4_0
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Subscriptions
No data.
Status: PUBLISHED
Assigner: Temporal
Published:
Updated: 2026-09-21T15:30:00.325Z
Reserved: 2026-07-22T18:08:48.925Z
Link: CVE-2026-65652
Updated: 2026-09-21T15:29:45.571Z
Status : Received
Published: 2026-09-21T12:17:15.800
Modified: 2026-09-21T16:17:11.140
Link: CVE-2026-65652
No data.
OpenCVE Enrichment
Updated: 2026-09-21T12:30:14Z