Low [CVE-2026-59277] org.springframework.security/spring-security-core: Spring Security: Information disclosure due to incomplete internal network classification
This low-severity Red Hat Linux advisory covers CVE-2026-59277 affecting OpenShift Developer Tools and Services, Red Hat Fuse 7, Red Hat OpenShift Dev Spaces.
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Summary
Spring Security 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.
In Spring Security 7.1.0, the internal address classification did not recognize the IPv4 and IPv6 any local addresses (0.0.0.0 and::) as internal. As a result, matchExternal() incorrectly classified these addresses as external, and matchInternal() failed to classify them as internal.
Applications that rely on matchInternal() or matchExternal() for IP-based access control may incorrectly treat these addresses as external, potentially allowing unauthorized read access to resources intended for internal networks only.
Red Hat OpenShift Jenkins (ocp-tools) in Red Hat OpenShift Container Platform 4.20 includes Spring Security 7.1.0 and is affected. Other Red Hat Hybrid Platforms products evaluated for this flaw, including Red Hat OpenShift Dev Spaces, do not include the affected Spring Security version and are not affected.
Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N). Weakness: CWE-184.
Affected Red Hat products: OpenShift Developer Tools and Services; Red Hat Fuse 7; Red Hat OpenShift Dev Spaces; Red Hat Single Sign-On 7.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or does not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation use cases, and the lack of negative side effects to extended use. For the above product(s), Red Hat recommends that customers evaluate each potential workaround as part of their own risk assessment. Upstream fix: upgrade Spring Security to 7.1.1 or later. Workaround: replace InetAddressMatchers.matchInternal() or matchExternal() usage with explicit CIDR-based IpAddressMatcher rules for the private ranges your deployment requires (for example 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16).
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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