CVE-2026-39882 MEDIUM

CVE-2026-39882: OpenTelemetry-Go OTLP HTTP exporters read unbounded HTTP response bodies

Vendor Open-Telemetry
Product opentelemetry-go
Weakness CWE-789
Published April 8, 2026
Last update April 9, 2026

CVSS base score

5.3/10
Attack vector Adjacent
Attack complexity High
Privileges required None
User interaction None
Confidentiality None
Integrity None

CVSS vector

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

What the vulnerability does

01Description

OpenTelemetry-Go is the Go implementation of OpenTelemetry. Prior to 1.43.0, the otlp HTTP exporters (traces/metrics/logs) read the full HTTP response body into an in-memory bytes.Buffer without a size cap. This is exploitable for memory exhaustion when the configured collector endpoint is attacker-controlled (or a network attacker can mitm the exporter connection). This vulnerability is fixed in 1.43.0.

Key dates

02Disclosure timeline

April 8, 2026 CVE published
April 9, 2026 Record updated