CVE-2026-59276 VMware CVE debrief

Who should care

Security teams and developers using affected Spring Security versions should assess and apply remediation to prevent potential timing side-channel attacks. This includes reviewing and updating affected systems, applying vendor remediation or compensating controls, and monitoring for potential attacks. Security teams should also verify the affected versions and assess the operational impact of the vulnerability. Vulnerability management and security teams should prioritize this vulnerability for remediation due to its potential impact on security-sensitive data. Affected operators and platforms should be reviewed for potential exposure. Security teams should also consider implementing compensating controls for exposed systems while remediation is scheduled and verified. Monitoring and detection capabilities should be reviewed to ensure they can detect potential attacks. Asset inventory and change management processes should be updated to account for this vulnerability. Rollback and change window procedures should be reviewed to ensure they can handle remediation efforts. Source tracking and incident response plans should also be updated to account for this vulnerability. The CVE record was published on 2026-08-27T20:17:53.863Z and has not been modified since then, indicating that the information is current and relevant. The vulnerability affects multiple versions of Spring Security, including 5.7.0 - 5.7.25, 5.8.0 - 5.8.27, 6.4.0 - 6.4.18, 6.5.0 - 6.5.11, 7.0.0 - 7.0.6, and 7.1.0, which are widely used in various systems and applications. The vulnerability has a medium severity level, but its impact could be significant if exploited. Therefore, it is essential for security teams and developers to assess and remediate this vulnerability promptly. The recommended actions include inventory and verification of affected Spring Security versions, application of vendor remediation or compensating controls, monitoring for potential timing side-channel attacks, and exception tracking and retest recommended. The defensive priority is medium, indicating that this vulnerability should be addressed promptly but not necessarily immediately. The evidence notes provide further

Technical summary

Several components in Spring Security compare security-sensitive values using standard string equality (String.equals()) rather than a constant-time comparison. This could allow potential timing side-channel attacks. Affected versions include Spring Security 5.7.0 - 5.7.25, 5.8.0 - 5.8.27, 6.4.0 - 6.4.18, 6.5.0 - 6.5.11, 7.0.0 - 7.0.6, and 7.1.0. The vulnerability has a CVSS score of 5.9 and a MEDIUM severity level.

Defensive priority

Medium-priority defensive review recommended due to potential timing side-channel attack surface in Spring Security versions.

Recommended defensive actions

• Inventory and verify affected Spring Security versions
• Apply vendor remediation or compensating controls
• Monitor for potential timing side-channel attacks
• Exception tracking and retest recommended
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.

Evidence notes

Evidence from official CVE and NVD sources indicates a medium-severity vulnerability in Spring Security. Defensive verification tasks are recommended to assess affected versions and apply vendor remediation. The CVE record was published on 2026-08-27T20:17:53.863Z and has not been modified since then. Evidence limits suggest that further verification is needed to confirm affected scope and severity.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.