Medium severity · published Sep 28, 2026
CVE-2026-101913
ip-address: Address6.isLinkLocal() recognizes fe80::/64 rather than fe80::/10, allowing SSRF and trust-boundary bypass to on-link hosts
6.3
CVSS
0.4%
EPSS
No
On KEV
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IP
ip-address · beaugunderson
< 10.5.1 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-101913
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-101913
x_refsource_CONFIRM
https://github.com/beaugunderson/ip-address/security/advisories/GHSA-rpw4-54j3-4h4q
x_refsource_MISC
https://github.com/beaugunderson/ip-address/commit/d03e960c7cc3179ef25c8a44b4f94dd499625546
x_refsource_MISC
https://github.com/beaugunderson/ip-address/releases/tag/v10.5.1
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