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CVE-2026-59303 Spring CVE debrief

CVE-2026-59303 is a vulnerability in Spring Cloud Stream that allows for an unbounded dynamic destination cache size, affecting versions 5.0.0 - 5.0.2, 4.3.0 - 4.3.3, and 4.2.0 - 4.2.6. This issue has a CVSS score of 3.1 and is classified as LOW severity. Users of affected versions should review and apply patches. The vulnerability is related to an unbounded dynamic destination cache size in Spring Cloud Stream. The CVE record was published on 2026-08-27T20:17:56.640Z and has not been modified since then.

Vendor
Spring
Product
Spring Cloud Stream
CVSS
LOW 3.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-27
Original CVE updated
2026-09-04
Advisory published
2026-08-27
Advisory updated
2026-09-04

Who should care

Users of Spring Cloud Stream versions 5.0.0 - 5.0.2, 4.3.0 - 4.3.3, and 4.2.0 - 4.2.6 should review and apply patches for this vulnerability. This includes operators, platform administrators, vulnerability management teams, and security teams responsible for these systems.

Technical summary

CVE-2026-59303 is a vulnerability in Spring Cloud Stream that allows for an unbounded dynamic destination cache size. This vulnerability affects Spring Cloud Stream versions 5.0.0 - 5.0.2, 4.3.0 - 4.3.3, and 4.2.0 - 4.2.6, with a CVSS score of 3.1 and severity LOW. Users of affected versions should review and apply patches.

Defensive priority

Review and apply patches for Spring Cloud Stream vulnerabilities.

Recommended defensive actions

  • Review and apply patches for Spring Cloud Stream vulnerabilities.
  • Inventory and verify affected Spring Cloud Stream versions.
  • Monitor for potential exploitation attempts.
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
  • Review compensating controls for exposed systems while remediation is scheduled and verified.

Evidence notes

The CVE-2026-59303 record indicates a vulnerability in Spring Cloud Stream with a CVSS score of 3.1 and severity LOW. Affected versions include Spring Cloud Stream 5.0.0 - 5.0.2, 4.3.0 - 4.3.3, and 4.2.0 - 4.2.6. The vulnerability is related to an unbounded dynamic destination cache size. Evidence is limited to CVE Program and NVD sources.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-59303 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-59303

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

  • CVE-2026-59303 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-59303

    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.