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CVE-2026-43869 Apache CVE debrief

CVE-2026-43869 is an Improper Validation of Certificate with Host Mismatch vulnerability in Apache Thrift. The issue affects Apache Thrift versions before 0.23.0. Users are recommended to upgrade to version 0.23.0, which fixes the issue. The vulnerability has a CVSS score of 7.3 and is classified as HIGH severity. It was published on May 5, 2026, and modified on July 1, 2026.

Vendor
Apache
Product
Thrift
CVSS
HIGH 7.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-05-05
Original CVE updated
2026-09-09
Advisory published
2026-05-05
Advisory updated
2026-09-09

Who should care

Organizations using Apache Thrift before version 0.23.0 should be aware of this vulnerability and take steps to upgrade. This vulnerability could potentially allow attackers to exploit the certificate validation issue. Users of Apache Thrift should review their systems and apply the necessary updates.

Technical summary

The CVE-2026-43869 vulnerability is caused by an improper validation of certificate with host mismatch in Apache Thrift. This issue allows for potential exploitation by attackers. The vulnerability has been addressed in Apache Thrift version 0.23.0. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L. The weaknesses associated with this vulnerability include CWE-297 and CWE-295.

Defensive priority

Defenders should prioritize upgrading Apache Thrift to version 0.23.0. They should also review their systems for any instances of Apache Thrift running below version 0.23.0 and apply the necessary updates.

Recommended defensive actions

  • Upgrade Apache Thrift to version 0.23.0 or later.
  • Review systems for Apache Thrift instances below version 0.23.0 and apply updates.
  • Monitor Apache Thrift usage and ensure proper certificate validation.
  • Consider implementing additional security measures to detect and prevent exploitation attempts.
  • Verify the integrity of certificates used with Apache Thrift.
  • Update documentation and procedures to reflect the changes.

Evidence notes

The CVE-2026-43869 vulnerability was published on May 5, 2026, and modified on July 1, 2026. The vulnerability affects Apache Thrift versions before 0.23.0. The CVSS score for this vulnerability is 7.3, indicating a HIGH severity level. The CWE-297 and CWE-295 weaknesses are associated with this vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-43869 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-43869

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

  • CVE-2026-43869 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-43869

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

Supplemental references

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://lists.apache.org/thread/3hsgl1b69wzq3ry39scqbv2dhyl3j52r

    [email protected] - Vendor Advisory

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/errata/RHSA-2026:21769

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/errata/RHSA-2026:22347

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/errata/RHSA-2026:22423

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/errata/RHSA-2026:23345

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

  • Source reference

    Unverified legacy reference

    URL: https://access.redhat.com/errata/RHSA-2026:24503

    0b0ca135-0b70-47e7-9f44-1890c2a1c46c

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.