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PatchSiren cyber security CVE debrief

CVE-2026-41850 Spring CVE debrief

CVE-2026-41850 is a HIGH severity vulnerability in Spring Framework, with a CVSS score of 7.5. Applications that evaluate user-supplied Spring Expression Language (SpEL) expressions are vulnerable to an Algorithmic Denial of Service (DoS). By providing a specially crafted expression, an attacker can trigger excessive resource consumption during evaluation, leading to application degradation or unavailability. The affected versions are Spring Framework 7.0.0 through 7.0.7, 6.2.0 through 6.2.18, 6.1.0 through 6.1.27, and 5.3.0 through 5.3.48.

Vendor
Spring
Product
Spring Framework
CVSS
HIGH 7.5
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 Spring Framework versions 7.0.0 through 7.0.7, 6.2.0 through 6.2.18, 6.1.0 through 6.1.27, and 5.3.0 through 5.3.48 should be aware of this vulnerability and take necessary actions to mitigate it.

Technical summary

The vulnerability is caused by the evaluation of user-supplied Spring Expression Language (SpEL) expressions, which can lead to excessive resource consumption and application degradation or unavailability.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to a non-vulnerable version of Spring Framework.
  • Implement measures to restrict user-supplied input to prevent specially crafted expressions from being evaluated.

Evidence notes

The CVE record and NVD detail provide information on the affected versions and CVSS score.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-41850 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-41850

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

  • CVE-2026-41850 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-41850

    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.