CVE-2026-85088
Description
A flaw was found in Apache Thrift. During Transport Layer Security (TLS) certificate validation, the client libraries improperly evaluate the certificate's Common Name (CN) when subject alternative name (SAN) entries do not match the target host. A network-positioned attacker possessing a trusted certificate matching the host's Common Name can exploit this vulnerability to impersonate the legitimate server. Successful exploitation allows the attacker to intercept or tamper with encrypted communications.
Statement
This vulnerability is evaluated as an Important severity because it allows a machine-in-the-middle adversary on the network path to bypass TLS hostname validation, completely compromising transport confidentiality and integrity.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
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
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
