How severe is GHSA-84g5-x8j3-7235?

No CVSS score has been assigned to GHSA-84g5-x8j3-7235 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-84g5-x8j3-7235?

GHSA-84g5-x8j3-7235 affects the following packages: github.com/tinfoil-factory/netfoil (Go). Ecosystems affected: Go.

How do I fix GHSA-84g5-x8j3-7235?

Update github.com/tinfoil-factory/netfoil to 0.2.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-84g5-x8j3-7235 is resolved across your whole dependency graph.

How do I detect GHSA-84g5-x8j3-7235 in my Go dependencies?

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

How do I mitigate GHSA-84g5-x8j3-7235 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-84g5-x8j3-7235 actively exploited in the wild?

No public exploit code has been indexed for GHSA-84g5-x8j3-7235 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-84g5-x8j3-7235 published, and has it been updated?

GHSA-84g5-x8j3-7235 was published on April 29, 2026 and was last updated on June 25, 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

Netfoil has incorrect allowlist enforcementGHSA-84g5-x8j3-7235

Fix: tinfoil-factory/netfoil@0ca054a

GHSA-84g5-x8j3-7235 is a security vulnerability in github.com/tinfoil-factory/netfoil. A fix is available for github.com/tinfoil-factory/netfoil — see the affected versions and patch details below.

Also known asGO-2026-5240

Published

Apr 29, 2026

Updated

Jun 25, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Jun 25, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🐹github.com/tinfoil-factory/netfoil

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

Summary

Rules could be bypassed by changing the first character: example.com could be be bypassed by e.g. fxample.com.

Details

Off-by-one error in the suffixtrie implementation.

Impact

The domain filter could be bypassed. Please note that DNS filtering alone is not enough to block malicious traffic.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/tinfoil-factory/netfoil`	all versions	0.2.1`go get github.com/tinfoil-factory/netfoil@v0.2.1`

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/tinfoil-factory/netfoil, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/tinfoil-factory/netfoil to 0.2.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-84g5-x8j3-7235 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

### Summary Rules could be bypassed by changing the first character: `example.com` could be be bypassed by e.g. `fxample.com`. ### Details Off-by-one error in the suffixtrie implementation. ### Impact The domain filter could be bypassed. Please note that DNS filtering alone is not enough to block malicious traffic.

O3 Security · Impact-Aware SCA

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