CVE-2026-66053: Thrift Apache Thrift Python Bindings Have Vulnerability

MODERATE
Advisory Identifier: GHSA-hwrj-9rr4-24xh
Share
CVSS 5.9
CWE-297
Published
Advisory Summary

CVE-2026-66053 is a MODERATE (CVSS 5.9) apache thrift python bindings have vulnerability (CWE-297: Improper Validation of Certificate with Host Mismatch) affecting Thrift libraries in the PyPI ecosystem. The issue involves apache thrift python bindings have a improper validation of certificate with host mismatch vulnerabilit. Remediation is available by upgrading affected packages to version 0.24.0.

CVE-2026-66053 at a Glance

CVE Identifier CVE-2026-66053
GHSA Identifier GHSA-hwrj-9rr4-24xh
Severity MODERATE
CVSS v3.1 Base Score 5.9
CWE Classification CWE-297: Improper Validation of Certificate with Host Mismatch
Affected Product Thrift
Package Ecosystem PyPI
Published Date
Last Updated

Security Impact

CVSS: 5.9

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity None (I:N)
Availability None (A:N)

How to Fix CVE-2026-66053

To remediate this vulnerability, upgrade all affected Thrift dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

thrift fixed: 0.24.0 
pip install thrift>=0.24.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

pip show thrift

How to Check if You Are Affected

To determine whether your Python environment is affected by CVE-2026-66053, inspect your installed packages using pip:

pip show thrift

Analyze the terminal output to locate any version of Thrift in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.24.0), your application is affected.

Note: The pip show thrift command checks currently installed packages in your active Python environment.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-297: Improper Validation of Certificate with Host Mismatch, where 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. In Thrift, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Improper Validation of Certificate with Host Mismatch vulnerability in Apache Thrift Python bindings. This issue affects Apache Thrift: before 0.24.0. Users are recommended to upgrade to version 0.24.0, which fixes the issue. This replaces CVE-2026-41603

CVE-2026-66053 Affected Thrift Versions

1 component(s)
Fixed Versions:
0.24.0
Product / Package Ecosystem Affected Versions Fixed Version
thrift
pypi/thrift
PyPI
< 0.24.0
0.24.0

References

NVD — CVE-2026-66053 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-66053
Thrift Source Repository REPOSITORY
https://github.com/apache/thrift
lists.apache.org/thread/7v3jhgwfbmhx... WEB
https://lists.apache.org/thread/7v3jhgwfbmhx42424phydlnzb109g8b9
lists.apache.org/thread/w4k5dnv1x58k... WEB
https://lists.apache.org/thread/w4k5dnv1x58knwlhpo9x0or5xh220y65

Frequently Asked Questions

What is CVE-2026-66053?
CVE-2026-66053 is a security vulnerability in Thrift involving Apache Thrift Python bindings have a Improper Validation of Certificate with Host Mismatch vulnerabilit under CWE-297: Improper Validation of Certificate with Host Mismatch.
Which Thrift versions are affected?
Affected versions include releases prior to 0.24.0 across affected packages: thrift.
What version fixes CVE-2026-66053?
Upgrading to 0.24.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is thrift affected?
Yes, thrift is affected in releases prior to 0.24.0. Upgrade your dependency to 0.24.0 or later.
What is the CVSS score of CVE-2026-66053?
CVE-2026-66053 has a CVSS v3.1 base score of 5.9 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
What CWE is associated with CVE-2026-66053?
CVE-2026-66053 is classified under CWE-297: 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 can I check PyPI dependencies for CVE-2026-66053?
Run the dependency tree command: 'pip show thrift'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-hwrj-9rr4-24xh",
  "modified" : "2026-09-02T14:31:34Z",
  "published" : "2026-07-27T12:31:17Z",
  "aliases" : [ "CVE-2026-66053" ],
  "summary" : "Apache Thrift Python bindings have a Improper Validation of Certificate with Host Mismatch vulnerabilit",
  "details" : "Improper Validation of Certificate with Host Mismatch vulnerability in Apache Thrift Python bindings.\n\nThis issue affects Apache Thrift: before 0.24.0.\n\nUsers are recommended to upgrade to version 0.24.0, which fixes the issue.\n\nThis replaces CVE-2026-41603",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "PyPI",
      "name" : "thrift"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.24.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-66053"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/apache/thrift"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/7v3jhgwfbmhx42424phydlnzb109g8b9"
  }, {
    "type" : "WEB",
    "url" : "https://lists.apache.org/thread/w4k5dnv1x58knwlhpo9x0or5xh220y65"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-297" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-02T14:31:34Z",
    "nvd_published_at" : "2026-07-27T12:16:55Z"
  }
}