CVE-2026-69198 ip-address: a CIDR suffix on the parsed address suppresses special-use classification and can bypass SSRF and trust-boundary checks
Attackers can bypass SSRF protections by adding a CIDR suffix to IP addresses, causing the library to misclassify internal IPs as external.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-69198?
CVE-2026-69198 is a medium-severity server-side request forgery vulnerability in beaugunderson ip-address, published on 3 Aug 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. From 10.1.1 until 10.2.2, every special-use classification method is built on isInSubnet, which short-circuits to false whenever the address's own subnet mask is shorter than the reference range's mask. That mask comes verbatim from the CIDR suffix on the parsed input, so appending a suffix such as /0 suppresses classification entirely: isLoopback(), isPrivate(), isLinkLocal(), isCGNAT(), isMulticast(), isUnspecified(), isBroadcast(), isULA(), and getType() all report an internal address as unremarkable, while correctForm() and address still return the real internal target. 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, may therefore treat an internal target as external and allow the request. The underlying bit comparison is correct, and mask(n) already returns the first n bits of the full parsed address independently of subnetMask; the defect is solely that the containment guard sits in the classification path. This issue is fixed in version 10.2.2.
Which versions are affected by CVE-2026-69198?
2 open source packages ship an affected version, including ip-address.
| Package | Affected | Fixed in |
|---|---|---|
ip-address npm | From 10.1.1 | 10.2.2 |
ip-address npm | From 10.1.1 | 10.2.2 |
How do I fix CVE-2026-69198?
Upgrade ip-address to 10.2.2 or later.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-69198 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-69198 exists.
Sources
Also known as CLEANSTART-2026-JM61604, CLEANSTART-2026-RO11754, CLSA-2026-1793097608, CLSA-2026-1793181094, DEBIAN-CVE-2026-69198, ECHO-0168-8a52-6156 and 23 more.