CVE-2026-59277 Spring Security InetAddressMatchers Incomplete Internal Network Classification
Attackers can bypass internal network restrictions by exploiting incomplete IP classification logic in Spring Security's InetAddressMatchers utility.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-59277?
CVE-2026-59277 is a low-severity vulnerability in Spring Security, published on 27 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Spring Security's InetAddressMatchers utility provides matchInternal() and matchExternal() builders for constructing an InetAddressMatcher that classifies a given IP address as belonging to an internal (private) or external (public) network. Spring Security 7.1.0
Weakness: CWE-693
Which versions are affected by CVE-2026-59277?
It affects 1 product.
Products include Vmware Spring Security.
How do I fix CVE-2026-59277?
Upgrade to a fixed version.
Is CVE-2026-59277 being exploited?
There is no known exploitation of CVE-2026-59277 in the wild and no public exploit code.
Other vulnerabilities in Spring Security
- CVE-2014-3527 Authorization Bypass in Spring Security
- CVE-2026-59354 Spring Security OAuth2 Authorization Server: Insufficient validation of Dynamic Client Registration metadata
- CVE-2026-59270 Spring Security embedded UnboundID LDAP server exposes well-known administrative bind DN on all network interfaces
- CVE-2026-22732 Under Some Conditions Spring Security HTTP Headers Are not Written
- CVE-2023-34034 Access Control Bypass in Spring Security
Sources
Also known as CLEANSTART-2026-AI37690, GHSA-w9mx-mx4m-6m48.