CVE-2026-128086
OpenTelemetry-Go: Eager W3C baggage-property materialization causes bounded memory-allocation amplification
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 | CWE-400 CWE-405 |
| Vendor | open-telemetry |
| Product | opentelemetry-go |
| Published | Nov 13, 2026 |
Get instant alerts for open-telemetry opentelemetry-go
Be the first to know when new medium vulnerabilities affecting open-telemetry opentelemetry-go are published — delivered to Slack, Telegram or Discord.
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L