PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-40999 Spring CVE debrief

CVE-2026-40999 is a high-severity vulnerability in Spring Web Services. When WS-Addressing is used with non-anonymous ReplyTo or FaultTo addresses, Spring WS may initiate outbound connections through configured WebServiceMessageSender instances to destinations taken directly from request headers without verifying that those destinations are safe to connect to. This vulnerability affects Spring Web Services versions 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 CVSS score for this vulnerability is 8.6, indicating a high severity level. The vulnerability was published on [cvePublishedAt] and last modified on [cveModifiedAt].

Vendor
Spring
Product
Spring Web Services
CVSS
HIGH 8.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-11
Original CVE updated
2026-09-04
Advisory published
2026-06-11
Advisory updated
2026-09-04

Who should care

Users of affected Spring Web Services versions should be aware of this vulnerability and take necessary actions to mitigate potential risks.

Technical summary

The vulnerability arises from the lack of verification of destinations taken directly from request headers when WS-Addressing is used with non-anonymous ReplyTo or FaultTo addresses. This could potentially lead to security risks if an attacker can manipulate the request headers to connect to malicious destinations.

Defensive priority

High

Recommended defensive actions

  • Upgrade to a non-affected version of Spring Web Services.
  • Implement additional security measures to verify the safety of destinations before initiating outbound connections.

Evidence notes

The CVE record [resourceLinkAnnotations:cve-org] and NVD detail [resourceLinkAnnotations:nvd] provide further information about this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-40999 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-40999

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-40999 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-40999

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.