How severe is GHSA-xvg2-cgv6-6h7v?

No CVSS score has been assigned to GHSA-xvg2-cgv6-6h7v yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by GHSA-xvg2-cgv6-6h7v?

GHSA-xvg2-cgv6-6h7v affects the following packages: github.com/tinfoil-factory/netfoil (Go). Ecosystems affected: Go.

How do I fix GHSA-xvg2-cgv6-6h7v?

Update github.com/tinfoil-factory/netfoil to 0.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xvg2-cgv6-6h7v is resolved across your whole dependency graph.

How do I detect GHSA-xvg2-cgv6-6h7v 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-xvg2-cgv6-6h7v 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-xvg2-cgv6-6h7v actively exploited in the wild?

No public exploit code has been indexed for GHSA-xvg2-cgv6-6h7v 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-xvg2-cgv6-6h7v published, and has it been updated?

GHSA-xvg2-cgv6-6h7v was published on July 29, 2026 and was last updated on August 18, 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: Incorrect block responses could lead to localhost trafficGHSA-xvg2-cgv6-6h7v

Fix: tinfoil-factory/netfoil#33

GHSA-xvg2-cgv6-6h7v 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-2026-6143

Published

Jul 29, 2026

Updated

Aug 18, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Aug 18, 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

0.0.0.0 was used instead of NXDOMAIN for block responses. On Linux, which is the target platform for netfoil, the 0.0.0.0 is sent to localhost rather than just dropped.

Impact

Unintended traffic could be sent to localhost. Impact depends on running services and firewall rules.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/tinfoil-factory/netfoil`	all versions	0.4.0`go get github.com/tinfoil-factory/netfoil@v0.4.0`

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 0.4.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-xvg2-cgv6-6h7v 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 `0.0.0.0` was used instead of NXDOMAIN for block responses. On Linux, which is the target platform for netfoil, the `0.0.0.0` is sent to localhost rather than just dropped. ### Impact Unintended traffic could be sent to localhost. Impact depends on running services and firewall rules.

O3 Security · Impact-Aware SCA

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