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

Quick assessment

Affected
Spring Spring Web Services
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

VMware Spring Web Services是美国威睿（VMware）公司的一个SOAP Web服务开发框架。 VMware Spring Web Services 5.0.0至5.0.1版本、4.1.0至4.1.3版本、4.0.0至4.0.18版本和3.1.0至3.1.8版本存在加密问题漏洞，该漏洞源于Wss4jSecurityInterceptor默认启用RSA PKCS#1 v1.5密钥传输算法，可能导致接受弱加密密钥。

CVSS 4.8 · Medium EPSS 0.15% · P3

Possible ATT&CK Techniques 1 AI

T1552.002 · Credentials in Registry

Affected Version Matrix 4

VendorProduct Version RangeStatus
Spring Spring Web Services 5.0.0< 5.0.1.1 affected
4.1.0< 4.1.3.1 affected
4.0.0< 4.0.19 affected
3.1.0< 3.1.9 affected
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I. Basic Information for CVE-2026-40996

Vulnerability Information
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Vulnerability Title
Inbound WS-Security allows RSA PKCS#1 v1.5 key transport by default
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用已被攻破或存在风险的密码学算法
Source: CVE Program / CVE List V5
Vulnerability Title
VMware Spring Web Services 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
VMware Spring Web Services是美国威睿（VMware）公司的一个SOAP Web服务开发框架。 VMware Spring Web Services 5.0.0至5.0.1版本、4.1.0至4.1.3版本、4.0.0至4.0.18版本和3.1.0至3.1.8版本存在加密问题漏洞，该漏洞源于Wss4jSecurityInterceptor默认启用RSA PKCS#1 v1.5密钥传输算法，可能导致接受弱加密密钥。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Spring Spring Web Services 5.0.0 ~ 5.0.1.1 -

II. Public POCs for CVE-2026-40996

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III. Intelligence Information for CVE-2026-40996

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Vendor Advisories for CVE-2026-40996 (1)

Same Patch Batch · Spring · 2026-06-11 · 15 CVEs total

CVE-2026-40999 8.6 HIGH Spring WS SSRF via unvalidated WS-Addressing reply destinations
CVE-2026-40994 8.2 HIGH Wss4jSecurityInterceptor disables WS-I BSP validation by default
CVE-2026-40998 8.2 HIGH Jaxp13 XPath XXE via StreamSource and SAXSource
CVE-2026-41699 8.1 HIGH Unsafe Deserialization in Spring GraphQL
CVE-2026-41700 8.1 HIGH Cross-Site WebSocket Hijacking in Spring for GraphQL
CVE-2026-41856 7.5 HIGH Spring GraphQL Annotation Detection Vulnerability
CVE-2026-40987 7.1 HIGH Remote-file synchronizer in Spring Integration writes server-supplied filename under local
CVE-2026-40985 6.4 MEDIUM Data Binding Vulnerability in Spring Web Flow with Unified EL Parser
CVE-2026-40995 5.4 MEDIUM X.509 authentication bypasses Spring Security account checks
CVE-2026-40997 5.3 MEDIUM SOAP security faults leak Spring Security account state
CVE-2026-41001 5.3 MEDIUM Predictable Temp Directory in Artemis Auto-configuration
CVE-2026-40992 5.0 MEDIUM Mail Auto-Configuration Does Not Enable SSL Hostname Verification
CVE-2026-40986 4.8 MEDIUM Spring Web Flow JS RemotingHandler renders non-HTML Response as HTML
CVE-2026-41000 3.7 LOW WSS4J validation does not use configured replay cache

IV. Related Vulnerabilities

Same product: Spring Web Services
Same vendor: Spring
Same weakness: CWE-327

V. Comments for CVE-2026-40996

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