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CVE-2026-40996

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

MEDIUM
4.8
CVSS Score
Published: June 11, 2026 at 05:04 AM UTC
Updated: September 4, 2026 at 05:26 PM UTC
2 products affected across 2 vendorsSpring Web ServicesSpring Web Services

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Severity
MEDIUM4.8
Exploit prediction
EPSS 0.1%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Spring Web Services· Broadcom
95%
v < 3.1.94.0.0 ≤ v < 4.0.194.1.0 ≤ v < 4.1.3.15.0.0 ≤ v < 5.0.1.1
Affected range stops below 3.1.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.0.19, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.1.3.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.0.1.1, so it looks safe — our inference, not a vendor statement
Spring Web Services· Spring
60%
3.1.0 ≤ v < 3.1.94.0.0 ≤ v < 4.0.194.1.0 ≤ v < 4.1.3.15.0.0 ≤ v < 5.0.1.13.1.04.0.04.1.05.0.0
Affected range stops below 3.1.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.0.19, so it looks safe — our inference, not a vendor statement
Affected range stops below 4.1.3.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 5.0.1.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

Vendor AdvisoryMitigation
Source: cverecord
https://spring.io/security/cve-2026-40996

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.8MEDIUMvmware
Attack Vector
NETWORK
Complexity
HIGH
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-327

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