CVE-2026-40988

Description

An application using spring-security-saml2-service-provider and the REDIRECT binding for SAML 2.0 Login or Logout may be vulnerable to a denial of service by way of an unbounded writer that inflates the compressed SAML payload into memory. Affected versions: Spring Security 5.7.0 through 5.7.23; 5.8.0 through 5.8.25; 6.3.0 through 6.3.16; 6.4.0 through 6.4.16; 6.5.0 through 6.5.10; 7.0.0 through 7.0.5.

CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0033

Probability of exploitation

0.25%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

Affected Products

Vendor	Product	Versions
vmware	spring_security	5.7.0 — 5.7.24
vmware	spring_security	5.8.0 — 5.8.26
vmware	spring_security	6.3.0 — 6.3.17
vmware	spring_security	6.4.0 — 6.4.17
vmware	spring_security	6.5.0 — 6.5.11
vmware	spring_security	7.0.0 — 7.0.6

References

Advisories & Patches

https://spring.io/security/cve-2026-40988

Frequently Asked Questions

What is CVE-2026-40988? +

An application using spring-security-saml2-service-provider and the REDIRECT binding for SAML 2.0 Login or Logout may be vulnerable to a denial of service by way of an unbounded writer that inflates the compressed SAML payload into memory. Affected versions: Spring Security 5.7.0 through 5.7.23; 5.8.0 through 5.8.25; 6.3.0 through 6.3.16; 6.4.0 through 6.4.16; 6.5.0 through 6.5.10; 7.0.0 through 7.0.5. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-40988? +

CVE-2026-40988 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0033, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-40988? +

CVE-2026-40988 affects products from vmware, specifically: spring_security. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-40988? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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