CVE-2026-91135
Description
A flaw was found in Apache Thrift. A remote attacker can exploit a heap-based buffer overflow in the C++ transport component to achieve arbitrary code execution or cause a Denial of Service (DoS) through an application crash. The vulnerability occurs when an application enables compression transforms on outbound message frames and processes incompressible input provided by an untrusted peer. When the data expands during compression, it is copied into a memory buffer without adequate boundary validation, resulting in data being written outside the allocated memory limits.
Statement
This vulnerability is rated as Moderate impact because successful exploitation requires non-default transport configuration and specific payload characteristics to trigger memory corruption over the network. The issue specifically resides within the C++ implementation of Apache Thrift when outbound frame compression using ZLIB is explicitly activated. Deployments utilizing default framing mechanisms or non-C++ bindings do not encounter this boundary checking failure.
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).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7 | 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 | Low | N/A | N/A |
| Integrity Impact | Low | N/A | N/A |
| Availability Impact | High | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
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