9.8

CVE-2026-40974: spring spring boot Improper Certificate Validation

CVSS: 9.8v3.1CriticalAnalyzed
AliasesGHSA-mqvw-jfmh-93qq
Published 27-04-2026Last modified 28-04-2026
Open JSON

Vulnerability summary

CVE-2026-40974 is a critical (CVSS 9.8) Improper Certificate Validation vulnerability in spring spring boot. EPSS estimates a 0.36% chance of exploitation in the next 30 days, higher than 28.2% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
0.36%
0%100%
Low · +0.18 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 27-04-2026
    PublishedVulnerability first disclosed.
  2. 28-04-2026
    Last modifiedVulnerability information updated.

Description

Spring Boot's Cassandra auto-configuration does not perform hostname verification when establishing an SSL connection to Cassandra. Affected: Spring Boot 4.0.0–4.0.5 (fix 4.0.6), 3.5.0–3.5.13 (fix 3.5.14), 3.4.0–3.4.15 (fix 3.4.16), 3.3.0–3.3.18 (fix 3.3.19), 2.7.0–2.7.32 (fix 2.7.33); Cassandra SSL auto-configuration. Versions that are no longer supported are also affected per vendor advisory.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.36%

Chance of exploitation in the next 30 days

Percentile

28%

Versus all other CVEs

30-day change

+0.18 pp

From 0.18% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.36%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Org.springframework.boot1 product
  • spring-boot-cassandra≥ 4.0.0, < 4.0.6 | ≥ 3.5.0, < 3.5.14 | ≥ 3.4.0, ≤ 3.4.15 | ≥ 3.3.0, ≤ 3.3.18 | ≤ 2.7.32
Spring1 product
  • spring boot≥ 4.0.0, < 4.0.6 | ≥ 3.5.0, < 3.5.14 | ≥ 3.4.0, < 3.4.16 | ≥ 3.3.0, < 3.3.19 | ≥ 2.7.0, < 2.7.33
Vmware1 product
  • spring_boot≥ 2.7.0, < 2.7.33 | ≥ 3.3.0, < 3.3.19 | ≥ 3.4.0, < 3.4.16 | ≥ 3.5.0, < 3.5.14 | ≥ 4.0.0, < 4.0.6

3 vendors · 3 products

References

3 links