How severe is GHSA-gmq2-39ff-f5qg?

No CVSS score has been assigned to GHSA-gmq2-39ff-f5qg yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-gmq2-39ff-f5qg?

GHSA-gmq2-39ff-f5qg affects the following packages: github.com/cloudflare/tableflip (Go). Ecosystems affected: Go.

How do I fix GHSA-gmq2-39ff-f5qg?

Update github.com/cloudflare/tableflip to 1.2.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-gmq2-39ff-f5qg is resolved across your whole dependency graph.

How do I detect GHSA-gmq2-39ff-f5qg in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/cloudflare/tableflip, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-gmq2-39ff-f5qg if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is GHSA-gmq2-39ff-f5qg actively exploited in the wild?

No public exploit code has been indexed for GHSA-gmq2-39ff-f5qg yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

When was GHSA-gmq2-39ff-f5qg published, and has it been updated?

GHSA-gmq2-39ff-f5qg was published on May 21, 2021 and was last updated on May 21, 2021. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹 Go

Not in CISA KEV

A failed upgrade may lead to hung goroutinesGHSA-gmq2-39ff-f5qg

Fix: cloudflare/tableflip@cae714b

GHSA-gmq2-39ff-f5qg is a security vulnerability in github.com/cloudflare/tableflip. A fix is available for github.com/cloudflare/tableflip — see the affected versions and patch details below.

Published

May 21, 2021

Updated

May 21, 2021

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of May 21, 2021 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🐹github.com/cloudflare/tableflip

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

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.

Patches

The problem has been fixed in v1.2.2.

Workarounds

None.

References

https://github.com/cloudflare/tableflip/commit/cae714b289e199db5da5f08af861ea65be6232c0

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/cloudflare/tableflip`	all versions	1.2.2`go get github.com/cloudflare/tableflip@v1.2.2`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/cloudflare/tableflip, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/cloudflare/tableflip to 1.2.2 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-gmq2-39ff-f5qg is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

### 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

O3 Security · Impact-Aware SCA

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