Patch Forecast
Yellow warning
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CVE-2026-111997 · GHSA-rxp7-6hxx-x8q5

ip-address: Address6 matches a zone identifier in quadratic time ahead of its length limit, allowing a single long string to stall the process

Risk score
51/100
CVSS
6.3 v4.0
Exploit chance (30 days)
0.3%
Published
18 Oct 2026

Open in the live forecast Today's forecast

What to know

What it is
ip-address before 10.7.4 allows a denial of service (CPU consumption from quadratic complexity, and application stall) via many % characters in input reaching a function call that uses the Address6 constructor.
Affected
ip-address (npm) <= 10.7.3
Fix
Upgrade ip-address to 10.7.4 or later.
Exploitation
Public proof of concept

Story map

Story map: ip-addressTHE FLAWSTHE FIXCVE-2026-111997Address6 matches a zoneidentifier in quadratic timeahead of its length limit…CVSS 6.3 · EPSS 0%CVE-2026-101910No classifier recognizes theNAT64 local-use range64:ff9b:1::/48, allowing SSRF…CVSS 6.9 · EPSS 0%CVE-2026-101913Address6.isLinkLocal()recognizes fe80::/64 ratherthan fe80::/10, allowing SSRF…CVSS 6.3 · EPSS 0%CVE-2026-101912IsInSubnet() andisHostInSubnet() compareaddresses of different…CVSS 6.3 · EPSS 0%Upgrade ip-address10.7.4 · 10.5.1 · 10.7.1or later on your release lineWho is exposedip-address (npm) >= 10.2.0, <=10.5.0YELLOW · PLAN IT INip-addressip-address is a library forparsing and manipulating IPv4and IPv6 addresses inJavaScript. From 10.2.0 until10.5.1, the Address6 isPrivateclassifier in src/ipv6.ts doesnot recognize the NAT64…Where it standsPublic proof of conceptCONNECTS TOSame weaknessCWE-1333 (CWE-1333)43 other warnings in 30 days →
Story map: the flaws, the fix, how it unfolded and what it connects to. Boxes link to the record or article.

At a glance

ip-address: Yellow, plan it in. ip-address is a library for parsing and manipulating IPv4 and IPv6 addresses in JavaScript. From 10.2.0 until 10.5.1, the Address6 isPrivate classifier in src/ipv6.ts does not recognize the NAT64 local-use range 64:ff9b:1::/48. Applications that combine isPrivate, isLoopback, and isLinkLocal for a trust-boundary decis…

The flaws

  • CVE-2026-111997: Address6 matches a zone identifier in quadratic time ahead of its length limit, allowing a single long string to stall the process (CVSS 6.3 · EPSS 0%)
  • CVE-2026-101910: No classifier recognizes the NAT64 local-use range 64:ff9b:1::/48, allowing SSRF and trust-boundary bypass (CVSS 6.9 · EPSS 0%)
  • CVE-2026-101913: Address6.isLinkLocal() recognizes fe80::/64 rather than fe80::/10, allowing SSRF and trust-boundary bypass to on-link hosts (CVSS 6.3 · EPSS 0%)
  • CVE-2026-101912: IsInSubnet() and isHostInSubnet() compare addresses of different families as if they shared an address space, allowing an allowlist check to admit an address outside its range (CVSS 6.3 · EPSS 0%)

The fix

Upgrade ip-address: 10.7.4 · 10.5.1 · 10.7.1 or later on your release line

Who is exposed: ip-address (npm) >= 10.2.0, <= 10.5.0

Where it stands

  • Public proof of concept

Connects to

Why it is Yellow

  • CVSS 6.3 medium
  • Public exploit or proof of concept referenced
  • On your watchlist: npm

Affected packages

PackageEcosystemVulnerableFixed in
ip-addressnpm<= 10.7.310.7.4

References

Original description

ip-address before 10.7.4 allows a denial of service (CPU consumption from quadratic complexity, and application stall) via many % characters in input reaching a function call that uses the Address6 constructor.

Last activity 18 Oct 2026. Patch Forecast updates every hour.