PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-41849 Spring CVE debrief

CVE-2026-41849 is a HIGH severity vulnerability with a CVSS score of 7.5. The vulnerability exists in the evaluation logic of the Spring Expression Language (SpEL) and can be exploited by supplying a specially crafted SpEL expression, resulting in excessive resource consumption and a Denial of Service (DoS).

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
2026-06-09
Advisory published
2026-06-09
Advisory updated
2026-06-09

Who should care

Users of Spring Framework 5.3.0 through 5.3.48 should be aware of this vulnerability and take steps to mitigate it.

Technical summary

An integer overflow vulnerability exists in the evaluation logic of the Spring Expression Language (SpEL). An attacker can exploit this by supplying a specially crafted SpEL expression that triggers excessive resource consumption, resulting in a Denial of Service (DoS).

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to Spring Framework 5.3.49 or later.
  • Implement proper input validation and sanitization for SpEL expressions.
  • Monitor and limit resource consumption by SpEL expressions.

Evidence notes

The CVE-2026-41849 vulnerability was published on 2026-06-09T05:16:37.060Z and modified on 2026-06-09T20:36:29.947Z. The vulnerability affects Spring Framework 5.3.0 through 5.3.48.

Official resources

CVE-2026-41849 was published on 2026-06-09T05:16:37.060Z and modified on 2026-06-09T20:36:29.947Z.