What’s Vulnerable › Vulnerabilities
CVE-2026-59276: Timing Attack via Non-Constant-Time Comparison of Sensitive Values
- Severity: medium (CVSS 5.9 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-208
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
Affected products
- Spring Security: from 5.7.0 before 5.7.26; from 5.8.0 before 5.8.28; from 6.4.0 before 6.4.19; from 6.5.0 before 6.5.12; from 7.0.0 before 7.0.6.1; from 7.1.0 before 7.1.0.1 — fixed in 5.7.26, 5.8.28, 6.4.19, 6.5.12, 7.0.6.1, 7.1.0.1
- Spring Security: from 7.0.0 through 7.0.6; from 6.5.0 through 6.5.11; from 6.4.0 through 6.4.18; from 5.8.0 through 5.8.27; from 5.7.0 through 5.7.25; 7.1.0
How to fix
Upgrade to a fixed version: Spring Security 5.7.26, 5.8.28, 6.4.19, 6.5.12. Check the vendor advisory for mitigations.
References
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