CVE-2026-39882

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.

Score

CVSS 3.1 5.3 Medium

Status

Analyzed - security-advisories@github.com

Published

2026-04-08

Last modified

2026-04-09

Weaknesses

CWE-789

Affected products

• Opentelemetry-go (Open-telemetry)
• Opentelemetry (Opentelemetry)

References

• https://github.com/open-telemetry/opentelemetry-go/pull/8108
• https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-w8rr-5gcm-pp58