CVE-2026-85087
Description
A flaw was found in Apache Thrift's Python bindings. Due to improper certificate validation and incorrect status code handling, client applications fail to properly verify the authenticity of a remote server during encrypted connections. A remote attacker in a man-in-the-middle position could exploit this vulnerability to intercept and modify sensitive network communications, resulting in information disclosure and data tampering.
Statement
This vulnerability is rated as Important severity because it completely invalidates TLS server identity verification, exposing encrypted traffic to complete loss of confidentiality and integrity even though exploitation requires an adversary to achieve a man-in-the-middle network position. In Red Hat environments, the risk is concentrated in deployments where Python applications employ Thrift clients to establish encrypted connections on modern runtimes. Because the failure occurs silently during the handshake, affected services continue communication under the false assumption of transport security.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7.4 | N/A | N/A |
| Attack Vector | Network | N/A | N/A |
| Attack Complexity | High | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Unchanged | N/A | N/A |
| Confidentiality | High | N/A | N/A |
| Integrity Impact | High | N/A | N/A |
| Availability Impact | None | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Understanding the Weakness (CWE)
Integrity,Authentication
Technical Impact: Bypass Protection Mechanism; Gain Privileges or Assume Identity
When a certificate is invalid or malicious, it might allow an attacker to spoof a trusted entity by interfering in the communication path between the host and client. The product might connect to a malicious host while believing it is a trusted host, or the product might be deceived into accepting spoofed data that appears to originate from a trusted host.
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