What’s Vulnerable › Vulnerabilities

CVE-2026-59277: Spring Security InetAddressMatchers Incomplete Internal Network Classification

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-27 · updated 2026-09-02
• Weakness: CWE-693

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

Affected products

• Spring Security: from 7.1.0 before 7.1.0.1 — fixed in 7.1.0.1
• Spring Security: 7.1.0

How to fix

Upgrade to a fixed version: Spring Security 7.1.0.1. Check the vendor advisory for mitigations.

References

• https://spring.io/security/cve-2026-59277

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