CyberSecBulletin
CVE-2026-43869NVD status: Modified

Apache Thrift: Improper Validation of Certificate with Host Mismatch

Published Updated By the CyberSecBulletin desk

CVE-2026-43869 is a high-severity improper validation of certificate with host mismatch vulnerability in Apache Thrift from Apache, with a CVSS 3.1 base score of 7.3 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists version 0.23.0 as the first without the flaw, so updating Apache Thrift to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.63% chance of exploitation within 30 days, higher than 51% of scored CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Apache Thrift to 0.23.0 or a later version.
  2. Update Thrift to 0.23.0 or a later version.
  3. Read the advisory on lists.apache.org for workarounds and exact fixed builds.
  4. Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.

Affected products and versions

VendorProductAffected versionsFixed in
ApacheApache Thriftbefore 0.23.00.23.0
Red HatCryostat 4 on RHEL 9Not specified in the recordNot stated
Red HatRed Hat Build of Apache Camel 3.33 for Quarkus 3.33.2.SP1Not specified in the recordNot stated
Red HatMulticluster Global Hub 1.3.4Not specified in the recordNot stated
Red HatMulticluster Global Hub 1.4.5Not specified in the recordNot stated
Red HatMulticluster Global Hub 1.6.5Not specified in the recordNot stated
Red HatMulticluster Global Hub 1.7.0Not specified in the recordNot stated
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.13Not specified in the recordNot stated
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.14Not specified in the recordNot stated
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.15Not specified in the recordNot stated
Red HatRed Hat Advanced Cluster Management for Kubernetes 2.16Not specified in the recordNot stated
Red HatRed Hat multicluster global hub 1.5.3Not specified in the recordNot stated
Red HatRed Hat OpenShift AI 2.25Not specified in the recordNot stated
Red HatRed Hat OpenShift distributed tracing 3.10.2Not specified in the recordNot stated
Red HatMulticluster Global HubNot specified in the recordNot stated
Red HatOpenShift Service Mesh 2Not specified in the recordNot stated
Red HatRed Hat Advanced Cluster Management for Kubernetes 2Not specified in the recordNot stated
Red HatRed Hat AI Inference ServerNot specified in the recordNot stated
Red HatRed Hat build of Apache Camel 4 for Quarkus 3Not specified in the recordNot stated
Red HatRed Hat Data Grid 8Not specified in the recordNot stated
Red HatRed Hat Enterprise Linux 8Not specified in the recordNot stated
Red HatRed Hat Fuse 7Not specified in the recordNot stated
Red HatRed Hat JBoss Enterprise Application Platform Expansion PackNot specified in the recordNot stated
Red HatRed Hat OpenShift AI (RHOAI)Not specified in the recordNot stated
Red HatRed Hat OpenShift Container Platform 4Not specified in the recordNot stated

Version data comes from the organisation that assigned the CVE; 3 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
NoneNo account or login is needed.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
LowSome restricted data can be read.
Integrity
LowLimited modification of data is possible.
Availability
LowPerformance or availability is reduced.

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L. Scored by CNA.

Scoring systemScoreSeverityScored by
CVSS 3.17.3HighCISA (ADP)
CVSS 3.17.3HighCNA

Official description

Improper Validation of Certificate with Host Mismatch vulnerability in Apache Thrift. This issue affects Apache Thrift: before 0.23.0. Users are recommended to upgrade to version 0.23.0, which fixes the issue.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Improper Validation of Certificate with Host Mismatch

The product communicates with a host that provides a certificate, but the product does not properly ensure that the certificate is actually associated with that host.

How developers prevent this class of flaw

  • In order to ensure data integrity, the certificate must be valid, and it must pertain to the site that is being accessed.Fully check the hostname of the certificate and provide the user with adequate information about the nature of the problem and how to proceed.
  • If certificate pinning is being used, ensure that all relevant properties of the certificate are fully validated before the certificate is pinned, including the hostname.
  • Be careful of other weaknesses in the code that checks the hostname, since it is still possible to incorrectly check the hostname. For example, attackers could create a certificate with a name that begins with a trusted name followed by a NUL byte, which could cause some string-based comparisons to only examine the portion that contains the trusted name.

More Improper Validation of Certificate with Host Mismatch vulnerabilities (CWE-297)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Third-party and government advisories

Other vulnerabilities in Apache Thrift

All Apache Thrift vulnerabilities

Recent Improper Validation of Certificate with Host Mismatch vulnerabilities

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