Vulnerability in ip-address (CVE-2026-101913)
Summary
Vulnerability in ip-address (CVE-2026-101913). Risk of unauthorized operations or information disclosure. Exploitable via false. Mitigation: upgrade to 10.5.1 or later.
Original description
The description as published by the source.
Summary
Address6.isLinkLocal() recognizes fe80::/64 rather than fe80::/10. Link-local unicast is the whole /10 under RFC 4291 §2.4 and the IANA IPv6 Special-Purpose Address Registry, so the method returns false for every link-local address outside the one /64 that stateless address autoconfiguration happens to use. new Address6('fe81::1').isLinkLocal() is false.
The library contradicts itself on the same object: for fe81::1, getType() returns 'Link-local unicast', getScope() returns 'Link local', and isHostInSubnet(new Address6('fe80::/10')) returns true, while isLinkLocal() returns false.
An application that builds a network trust-boundary decision on these checks (for example a filter intended to block Server-Side Request Forgery, or SSRF) will classify a link-local target as unremarkable and allow the request. SSRF is an attack in which a user-supplied address coaxes the server into making a request to an internal destination the user could not otherwise reach.
Details
isLinkLocal() in src/ipv6.ts compares the first 64 bits of the address against a literal string:
// Zeroes are required, i.e. we can't check isHostInSubnet with 'fe80::/10'
if (
this.getBitsBase2(0, 64) ===
'1111111010000000000000000000000000000000000000000000000000000000'
) {
return true;
}
The comparison requires the first 64 bits to be exactly fe80:0000:0000:0000, so it accepts 2⁶⁴ of the 2¹¹⁸ addresses in fe80::/10. The comment stat…
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-101913 has been found in ip-address.
Attackers can target a specific entry point like false over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: upgrade ip-address to 10.5.1 or later.
If unsure, ask your IT team or search "ip-address CVE-2026-101913" on the vendor's site.
CVE-2026-101913 (ip-address) — CWE-697
Attack surface: false / true / isHostInSubnet / ipaddress
Patched: 10.5.1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-697) exists in ip-address. Attackers reach the vulnerable code path via false.
Check the vendor advisory for the affected versions of ip-address. Attack surface: false / true / isHostInSubnet / ipaddress.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to 10.5.1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'ip-address' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'ip-address' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
ip-addressを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade ip-address to 10.5.1ステージング環境で 10.5.1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-101913 node-ip-address
- Ubuntu UBUNTU-CVE-2026-101913 node-ip-address
References
- web github.com
- web github.com
- web github.com
- web nvd.nist.gov
- web github.com