Inbound WS-Security allows RSA PKCS#1 v1.5 key transport by default
CVE-2026-40996

4.8MEDIUM

Key Information:

Vendor

Spring

Status
Spring Web Services
Vendor
CVE Published:
11 June 2026

What is CVE-2026-40996?

Wss4jSecurityInterceptor defaulted allowRSA15KeyTransportAlgorithm to true, overriding Apache WSS4J's safer default for validation RequestData. Inbound WS-Security decryption could therefore accept RSA PKCS#1 v1.5 (rsa-1_5) encrypted key material unless operators explicitly reconfigured the flag.

Affected versions: Spring Web Services 5.0.0 through 5.0.1; 4.1.0 through 4.1.3; 4.0.0 through 4.0.18; 3.1.0 through 3.1.8.

Affected Version(s)

Spring Web Services 5.0.0 < 5.0.2

Spring Web Services 4.1.0 < 4.1.4

Spring Web Services 4.0.0 < 4.0.19

References

https://spring.io/security/cve-2026-40996

CVSS V3.1

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.