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CVE-2026-66331 Apache Software Foundation CVE debrief

CVE-2026-66331 is an Allocation of Resources Without Limits or Throttling vulnerability in Apache Thrift Delphi bindings buffered transport. This issue affects Apache Thrift before version 0.25.0. Users are recommended to upgrade to version 0.25.0, which fixes the issue. The vulnerability can lead to potential denial of service or performance degradation. Users of Apache Thrift Delphi bindings buffered transport should assess their exposure and plan for an upgrade to version 0.25.0. The fix involves upgrading to the latest version of Apache Thrift, which addresses the resource allocation issue.

Vendor
Apache Software Foundation
Product
Apache Thrift
CVSS
MEDIUM 6.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-02
Original CVE updated
2026-10-03
Advisory published
2026-10-02
Advisory updated
2026-10-03

Who should care

Users of Apache Thrift Delphi bindings buffered transport before version 0.25.0 should assess their exposure and plan for an upgrade to version 0.25.0. Operators, administrators, and security teams responsible for Apache Thrift deployments should review the vulnerability and take necessary actions to mitigate the risk.

Why it matters

CVE-2026-66331 is a medium-severity vulnerability in Apache Thrift Delphi bindings buffered transport that can lead to potential denial of service or performance degradation. Users should assess their exposure and upgrade to version 0.25.0 to fix the issue.

  • Potential denial of service due to resource exhaustion
  • Possible performance degradation due to inefficient resource allocation

Technical summary

The vulnerability is caused by an Allocation of Resources Without Limits or Throttling in Apache Thrift Delphi bindings buffered transport. This issue affects Apache Thrift before version 0.25.0. The vulnerability can lead to potential denial of service or performance degradation. Users should assess their exposure and upgrade to version 0.25.0 to fix the issue. The fix involves upgrading to the latest version of Apache Thrift, which addresses the resource allocation issue.

Defensive priority

Upgrade to version 0.25.0 to fix the vulnerability

Recommended defensive actions

  • Upgrade to version 0.25.0
  • Review and apply the fix
  • 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.
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The CVE record and NVD entry provide information about the vulnerability and its fix. The vulnerability is caused by an Allocation of Resources Without Limits or Throttling in Apache Thrift Delphi bindings buffered transport. Evidence is limited to public CVE and NVD sources. Defenders should verify affected scope and vendor guidance.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-66331 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-66331

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

  • CVE-2026-66331 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-66331

    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.