CVE-2026-29181: Opentelemetry

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

OpenTelemetry-Go is the Go implementation of OpenTelemetry. From 1.36.0 to 1.40.0, multi-value baggage: header extraction parses each header field-value independently and aggregates members across values. This allows an attacker to amplify cpu and allocations by sending many baggage: header lines, even when each individual value is within the 8192-byte per-value parse limit. This vulnerability is fixed in 1.41.0.

Affected products

• Opentelemetry Opentelemetry: from 1.36.0, before 1.41.0 (fixed in 1.41.0)

Published 2026-04-07. Last modified 2026-09-11.