Integer overflow in Spring Framework - CVE-2026-41849
Published: August 31, 2026
Vulnerability identifier: #VU146409
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-41849
CWE-ID: CWE-190
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to integer overflow in the Spring Expression Language (SpEL) evaluation logic when evaluating untrusted or user-controlled SpEL expressions. A remote attacker can supply a specially crafted SpEL expression to cause a denial of service.
Applications are vulnerable only if they accept and evaluate untrusted or user-controlled SpEL expressions.
Affected software
Spring Framework
How to mitigate CVE-2026-41849
Install security update from vendor's website.
Spring Framework - update to 5.3.49