Vmware Spring Web Services up to 3.1.8/4.0.18/4.1.3/5.0.1 risky encryption

Summaryinfo

A vulnerability, which was classified as problematic, was found in Vmware Spring Web Services up to 3.1.8/4.0.18/4.1.3/5.0.1. The impacted element is an unknown function. The manipulation results in risky encryption. This vulnerability is cataloged as CVE-2026-40996. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Vmware Spring Web Services up to 3.1.8/4.0.18/4.1.3/5.0.1. Affected is some unknown functionality. The manipulation with an unknown input leads to a risky encryption vulnerability. CWE is classifying the issue as CWE-327. The product uses a broken or risky cryptographic algorithm or protocol. This is going to have an impact on confidentiality. CVE summarizes:

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.

The advisory is shared for download at spring.io. This vulnerability is traded as CVE-2026-40996 since 04/16/2026. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/11/2026). The MITRE ATT&CK project declares the attack technique as T1600.

Upgrading to version 3.1.9, 4.0.19, 4.1.4 or 5.0.2 eliminates this vulnerability.

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Productinfo

Vendor

• Vmware

Name

• Spring Web Services

Version

• 3.1.0
• 3.1.1
• 3.1.2
• 3.1.3
• 3.1.4
• 3.1.5
• 3.1.6
• 3.1.7
• 3.1.8
• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4
• 4.0.5
• 4.0.6
• 4.0.7
• 4.0.8
• 4.0.9
• 4.0.10
• 4.0.11
• 4.0.12
• 4.0.13
• 4.0.14
• 4.0.15
• 4.0.16
• 4.0.17
• 4.0.18
• 4.1.0
• 4.1.1
• 4.1.2
• 4.1.3
• 5.0.0
• 5.0.1

License

• commercial

Website

• Vendor: https://www.vmware.com/

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