CVE-2026-65652 temporalio/tchannel-go malformed checksum type causes process termination
Remote attackers can crash applications using the tchannel-go library by sending malformed checksum types, causing a denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-65652?
CVE-2026-65652 is a high-severity denial of service vulnerability in temporalio/tchannel-go, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-129
Which versions are affected by CVE-2026-65652?
How do I fix CVE-2026-65652?
No fix has been published for CVE-2026-65652 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-65652 being exploited?
There is no known exploitation of CVE-2026-65652 in the wild and no public exploit code.
Sources
Also known as GHSA-2mhp-wpjp-pjr8.