Description
github.com/temporalio/tchannel-go did not reject TChannel call fragments containing checksum metadata but no length-prefixed argument chunks. The fragment reader left its chunk slice empty and then unconditionally selected the first element. A network peer can supply such a malformed call fragment, including as a direct initial call request after completing the standard initialization handshake. On that inbound path, the resulting unrecovered Go slice-bounds panic occurs on a library-created dispatch goroutine and terminates 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.
References6
- github.com/temporalio/tchannel-go/blob/8706a1ab5f617efd79dace7a…
- github.com/temporalio/tchannel-go/commit/0cb017f6870a8420695abe…
- github.com/temporalio/tchannel-go/commit/1dcfa67262ecd56a24f129…
- github.com/temporalio/tchannel-go/commit/8d8ca17342b3620d3a6d5c…
- github.com/temporalio/tchannel-go/pull/14
- github.com/temporalio/tchannel-go/tree/v1.22.1
Metrics
- CVSS 4.0
-
8.7
HIGH
Score source: 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - EPSS — exploit probability
- 1% percentile: 54 · as of 8 November 2026
- CWE
- CWE-129
Could this be exploited in your environment?
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