CVE-2026-65652

Summary

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 Software

Weaknesses

• CWE-129: CWE-129: Improper Validation of Array Index

Workarounds

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.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

References

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

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