CVE-2026-41310: Opentelemetry Opentelemetry.exporter.zipkin

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

OpenTelemetry.Exporter.Zipkin is the .NET Zipkin exporter for OpenTelemetry. In versions 1.15.2 and earlier, the Zipkin exporter remote endpoint cache accepts unbounded key growth derived from span attributes. In high-cardinality scenarios, a process using Zipkin export for client or producer spans could experience avoidable memory growth under sustained unique remote endpoint values, increasing process memory usage over time and degrading availability. This issue is fixed in version 1.15.3, which introduces a bounded, thread-safe LRU cache for remote endpoints with a fixed maximum size.

Affected products

• Opentelemetry Opentelemetry.exporter.zipkin: before 1.15.3 (fixed in 1.15.3)

Published 2026-05-06. Last modified 2026-06-17.