CVE-2026-39882
Description
A flaw was found in OpenTelemetry-Go. The otlp HTTP exporters read the full HTTP response body into an in-memory buffer without a size cap. A remote attacker, by controlling the collector endpoint or performing a man-in-the-middle (MITM) attack on the exporter connection, can exploit this to cause memory exhaustion. This vulnerability can lead to a Denial of Service (DoS) for the affected system.
Statement
This Important flaw in OpenTelemetry-Go's OTLP HTTP exporters can lead to a denial of service in Red Hat products, such as OpenShift Container Platform and Multicluster Engine for Kubernetes, that utilize OpenTelemetry-Go for telemetry collection. The vulnerability arises from the exporters reading HTTP response bodies into an unbounded in-memory buffer, allowing a remote attacker to exhaust system memory if they control the collector endpoint or perform a Man-in-the-Middle attack on the connection.
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 | 7.5 | N/A | 5.3 |
| Attack Vector | Network | N/A | Adjacent Network |
| Attack Complexity | Low | N/A | High |
| Privileges Required | None | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | None | N/A | None |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Understanding the Weakness (CWE)
Availability
Technical Impact: DoS: Resource Consumption (CPU); DoS: Resource Consumption (Memory); DoS: Resource Consumption (Other)
When allocating resources without limits, an attacker could prevent other systems, applications, or processes from accessing the same type of resource. It can be easy for an attacker to consume many resources by rapidly making many requests or causing larger resources to be used than is needed.
Frequently Asked Questions
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