CVE-2026-59276 Timing Attack via Non-Constant-Time Comparison of Sensitive Values

What is CVE-2026-59276?

CVE-2026-59276 is a medium-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

Several components in Spring Security compare security-sensitive values using standard string equality (String.equals()) rather than a constant-time comparison. Because String.equals() returns as soon as it finds a differing character, the time taken to reject an incorrect value is proportional to the number of leading characters that match the expected value. Spring Security 7.1.0 Spring Security 7.0.0 - 7.0.6 Spring Security 6.5.0 - 6.5.11 Spring Security 6.4.0 - 6.4.18 Spring Security 5.8.0 - 5.8.27 Spring Security 5.7.0 - 5.7.25

Weakness: CWE-208

Which versions are affected by CVE-2026-59276?

It affects 1 product.

Products include Vmware Spring Security.

How do I fix CVE-2026-59276?

Upgrade to a fixed version.

Is CVE-2026-59276 being exploited?

There is no known exploitation of CVE-2026-59276 in the wild and no public exploit code.

Other vulnerabilities in Spring Security

• CVE-2014-3527 Authorization Bypass in Spring Security Critical 9.8
• CVE-2026-59354 Spring Security OAuth2 Authorization Server: Insufficient validation of Dynamic Client Registration metadata Critical 9.6
• CVE-2026-59270 Spring Security embedded UnboundID LDAP server exposes well-known administrative bind DN on all network interfaces Critical 9.4
• CVE-2026-22732 Under Some Conditions Spring Security HTTP Headers Are not Written Critical 9.1
• CVE-2023-34034 Access Control Bypass in Spring Security Critical 9.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as CLEANSTART-2026-AA31447, CLEANSTART-2026-EV98830, CLEANSTART-2026-SI92815, ECHO-1d47-61cb-67e8, GHSA-vj7f-9q44-g5xv.