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CVE-2026-41851 Spring CVE debrief

CVE-2026-41851 is a Denial of Service (DoS) vulnerability in Spring Framework. Applications which accept user-supplied Spring Expression Language (SpEL) expressions may be vulnerable to a Denial of Service (DoS) attack if the evaluation of a SpEL expression triggers unbounded cache growth.

Vendor
Spring
Product
Spring Framework
CVSS
MEDIUM 5.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-09
Original CVE updated
2026-07-17
Advisory published
2026-06-09
Advisory updated
2026-07-17

Who should care

Users of affected Spring Framework versions: 7.0.0 through 7.0.7; 6.2.0 through 6.2.18; 6.1.0 through 6.1.27; 5.3.0 through 5.3.48.

Technical summary

The vulnerability has a CVSS score of 5.3 and a CVSS severity of MEDIUM. The CVSS vector is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L. The weakness is classified as CWE-770.

Defensive priority

MEDIUM

Recommended defensive actions

  • Upgrade to a non-vulnerable version of Spring Framework.
  • Implement measures to limit the growth of cache.
  • Monitor applications for unusual cache growth patterns.

Evidence notes

The CVE record was published on 2026-06-09T05:16:37.297Z and last modified on 2026-06-09T20:35:44.357Z. The vulnerability was reported by [email protected].

Sources and references

Verified primary and authoritative sources

  • CVE-2026-41851 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-41851

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-41851 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-41851

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental 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.