# ip-address: Address6.isLinkLocal() recognizes fe80::/64 rather than fe80::/10, allowing SSRF and trust-boundary bypass to on-link hosts

Advisory record · `GHSA-rpw4-54j3-4h4q`

- **Identifiers:** `GHSA-rpw4-54j3-4h4q` · `CVE-2026-101913`
- **State:** Confirmed
- **Severity:** CVSS 6.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-697](https://cwe.mitre.org/data/definitions/697.html) · [CWE-918](https://cwe.mitre.org/data/definitions/918.html)
- **Tags:** [Server-side request forgery (SSRF)](https://agentprime.io/advisories/tag/ssrf.md) · [CWE-697](https://agentprime.io/advisories/tag/cwe-697.md)
- **Published:** 28 Sept 2026
- **Updated:** 28 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 28 Sept 2026, 20:43 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `ip-address` (npm): affected `<10.5.1`; fixed in `10.5.1`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 6.3 Medium, CVSS 4.0: `CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0039, the 32nd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the GitHub Advisory Database, published 28 Sept 2026. New records show when each source confirmed them.

## Sources

- [GitHub Advisory Database: GHSA-rpw4-54j3-4h4q](https://github.com/advisories/GHSA-rpw4-54j3-4h4q)
- [OSV: GHSA-rpw4-54j3-4h4q](https://osv.dev/vulnerability/GHSA-rpw4-54j3-4h4q)
- <https://github.com/beaugunderson/ip-address/security/advisories/GHSA-rpw4-54j3-4h4q>
- <https://nvd.nist.gov/vuln/detail/CVE-2026-101913>
- <https://github.com/beaugunderson/ip-address/commit/d03e960c7cc3179ef25c8a44b4f94dd499625546>
- <https://github.com/beaugunderson/ip-address>
- <https://github.com/beaugunderson/ip-address/releases/tag/v10.5.1>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-rpw4-54j3-4h4q>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-rpw4-54j3-4h4q/>. Everything for agents: <https://agentprime.io/llms.txt>.