How severe is GHSA-gxhx-2686-5h9g?

No CVSS score has been assigned to GHSA-gxhx-2686-5h9g yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-gxhx-2686-5h9g?

GHSA-gxhx-2686-5h9g affects the following packages: github.com/slack-go/slack (Go). Ecosystems affected: Go.

How do I fix GHSA-gxhx-2686-5h9g?

Update github.com/slack-go/slack to 0.23.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-gxhx-2686-5h9g is resolved across your whole dependency graph.

How do I detect GHSA-gxhx-2686-5h9g in my Go dependencies?

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

How do I mitigate GHSA-gxhx-2686-5h9g 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-gxhx-2686-5h9g actively exploited in the wild?

No public exploit code has been indexed for GHSA-gxhx-2686-5h9g 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-gxhx-2686-5h9g published, and has it been updated?

GHSA-gxhx-2686-5h9g was published on May 14, 2026 and was last updated on September 10, 2026. 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

GHSA-gxhx-2686-5h9g — slack

Fix: slack-go/slack@34ad5c0

GHSA-gxhx-2686-5h9g is a security vulnerability in github.com/slack-go/slack. A fix is available for github.com/slack-go/slack — see the affected versions and patch details below.

slack-go `SecretsVerifier` accepts empty signing secret without precondition

Also known asGO-2026-5410

Published

May 14, 2026

Updated

Sep 10, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Sep 10, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🐹github.com/slack-go/slack

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

SecretsVerifier in slack-go/slack before v0.23.1 accepts an empty signing secret without error. If an application is misconfigured (e.g., an unset or empty SLACK_SIGNING_SECRET), NewSecretsVerifier builds an HMAC-SHA256 keyed with an empty string, allowing an unauthenticated attacker to forge a valid X-Slack-Signature and bypass Slack request authentication. Fixed in v0.23.1, which rejects empty secrets with ErrInvalidConfiguration. This is patched in version 0.23.1.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/slack-go/slack`	all versions	0.23.1`go get github.com/slack-go/slack@v0.23.1`

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/slack-go/slack, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/slack-go/slack to 0.23.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-gxhx-2686-5h9g 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

`SecretsVerifier` in slack-go/slack before v0.23.1 accepts an empty signing secret without error. If an application is misconfigured (e.g., an unset or empty `SLACK_SIGNING_SECRET`), `NewSecretsVerifier` builds an HMAC-SHA256 keyed with an empty string, allowing an unauthenticated attacker to forge a valid `X-Slack-Signature` and bypass Slack request authentication. Fixed in v0.23.1, which rejects empty secrets with `ErrInvalidConfiguration`. This is patched in version 0.23.1.

O3 Security · Impact-Aware SCA

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