CVE-2026-101913 ip-address: Address6.isLinkLocal() recognizes fe80::/64 rather than fe80::/10, allowing SSRF and trust-boundary bypass to on-link hosts
Attackers can bypass link-local address checks to access on-link hosts, leading to SSRF and trust-boundary violations in applications using the ip-address library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-101913?
CVE-2026-101913 is a medium-severity server-side request forgery vulnerability in beaugunderson ip-address, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. Prior to 10.5.1, the Address6 isLinkLocal method in src/ipv6.ts recognizes only fe80::/64 instead of the complete fe80::/10 IPv6 link-local range. An attacker-controlled address elsewhere in fe80::/10 can therefore pass a trust-boundary check that relies on isLinkLocal. The same address is identified as link-local by getType and getScope, exposing the inconsistent classification. A successful bypass can reach an on-link host outside the intended trust boundary. This issue is fixed in version 10.5.1.
Which versions are affected by CVE-2026-101913?
2 open source packages ship an affected version, including ip-address.
| Package | Affected | Fixed in |
|---|---|---|
ip-address npm | All versions | 10.5.1 |
ip-address npm | All versions | 10.5.1 |
How do I fix CVE-2026-101913?
Upgrade ip-address to 10.5.1 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-101913 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101913 exists.
Sources
Also known as CLEANSTART-2026-AO39613, CLEANSTART-2026-DP95262, CLEANSTART-2026-EE28153, CLEANSTART-2026-GF20241, CLEANSTART-2026-JF11250, CLSA-2026-1790676837 and 39 more.