Vulnerability · Published Apr 8, 2026 · Assigned by GitHub_M
CVE-2026-39882OpenTelemetry-Go OTLP HTTP exporters read unbounded HTTP response bodies
Medium 5.3
In plain English
A medium-severity security flaw in opentelemetry-go from open-telemetry. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 10% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | golang-opentelemetry-otel | no fix listed | DEBIAN-CVE-2026-39882 |
| Debian:13 | golang-opentelemetry-otel | no fix listed | DEBIAN-CVE-2026-39882 |
| Debian:14 | golang-opentelemetry-otel | 1.43.0-1 | DEBIAN-CVE-2026-39882 |
| Go | go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp | 0.19.0 | GO-2026-4985 |
| Go | go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp | 0.19.0 | GHSA-w8rr-5gcm-pp58 |
| Go | go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp | 1.43.0 | GHSA-w8rr-5gcm-pp58 |
| Go | go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp | 1.43.0 | GO-2026-4985 |
| Go | go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp | 1.43.0 | GHSA-w8rr-5gcm-pp58 |
| Go | go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp | 1.43.0 | GO-2026-4985 |
| Ubuntu:22.04:LTS | golang-opentelemetry-otel | no fix listed | UBUNTU-CVE-2026-39882 |
| Ubuntu:24.04:LTS | golang-opentelemetry-otel | no fix listed | UBUNTU-CVE-2026-39882 |
| Ubuntu:25.10 | golang-opentelemetry-otel | no fix listed | UBUNTU-CVE-2026-39882 |
| Ubuntu:26.04:LTS | golang-opentelemetry-otel | no fix listed | UBUNTU-CVE-2026-39882 |
| Ubuntu:26.10 | golang-opentelemetry-otel | no fix listed | UBUNTU-CVE-2026-39882 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| open-telemetry | opentelemetry-go | < 1.43.0 |
Weakness: CWE-789 · Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H