CVE-2026-128086

OpenTelemetry-Go is the Go implementation of OpenTelemetry. From version 1.0.0-RC1 until version 1.47.0, baggage.Parse and propagation.Baggage.Extract eagerly materialize every W3C baggage property through parseMember, grow property slices, serialize members, and copy properties into internal/baggage.Item. A valid densely populated baggage header can therefore cause allocation traffic and retained memory disproportionate to its bounded input size. Remote impact requires baggage extraction to be enabled, attacker-controlled input to reach it, and extraction to run before authentication or on a public route; the evidence establishes increased allocation and garbage-collection pressure but not reliable process termination. This issue is fixed in version 1.47.0.

• CWE-400
• CWE-405

• https://github.com/open-telemetry/opentelemetry-go/commit/f09d1de32f4ac7e5ef16394533721106b1a57b89
• https://github.com/open-telemetry/opentelemetry-go/pull/9024
• https://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.47.0
• https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-rrfc-gjm9-cgrj

Published

Nov 13, 2026

Last Modified

Nov 13, 2026

Status

Received

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