Summary
A failed upgrade may lead to hung goroutines
Workarounds
None.
References
Impact
Processes using tableflip may encounter hung goroutines in the parent process, after a failed upgrade.
The Go runtime has annoying behaviour around setting and clearing
O_NONBLOCK: exec.Cmd.Start() ends up calling os.File.Fd() for any
file in exec.Cmd.ExtraFiles. os.File.Fd() disables both the use
of the runtime poller for the file and clears O_NONBLOCK from
the underlying open file descriptor.
This can lead to goroutines hanging in a parent process, after at least
one failed upgrade. The bug manifests in goroutines which rely on
either a deadline or interruption via Close() to be unblocked being stuck
in read or accept like syscalls. As far as I can tell we've not experienced
this problem in production, so it's most likely quite rare.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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The problem has been fixed in v1.2.2.
Frequently Asked Questions
- What is GHSA-GMQ2-39FF-F5QG? GHSA-GMQ2-39FF-F5QG is a low-severity security vulnerability in github.com/cloudflare/tableflip (go), affecting versions < 1.2.1. It is fixed in 1.2.2.
- Which versions of github.com/cloudflare/tableflip are affected by GHSA-GMQ2-39FF-F5QG? github.com/cloudflare/tableflip (go) versions < 1.2.1 is affected.
- Is there a fix for GHSA-GMQ2-39FF-F5QG? Yes. GHSA-GMQ2-39FF-F5QG is fixed in 1.2.2. Upgrade to this version or later.
- Is GHSA-GMQ2-39FF-F5QG exploitable, and should I be worried? Whether GHSA-GMQ2-39FF-F5QG is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether GHSA-GMQ2-39FF-F5QG is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix GHSA-GMQ2-39FF-F5QG? Upgrade
github.com/cloudflare/tableflipto 1.2.2 or later.