CVE-2026-41310: OpenTelemetry .NET Zipkin exporter has unbounded remote endpoint cache leading to memory growth
Summary
The Zipkin exporter remote endpoint cache accepted unbounded key growth derived from span attributes. In high-cardinality scenarios, this could increase process memory usage over time and degrade availability.
Details
- Introduce a bounded, thread-safe LRU cache for remote endpoints. - Enforce fixed maximum size to prevent unbounded growth.
Impact
- A process using Zipkin export for client/producer spans could experience avoidable memory growth under sustained unique remote endpoint values.
Resources
#7081
Other sources
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.
— MITRE
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-41310?
CVE-2026-41310 is considered a moderate severity vulnerability due to its potential to increase memory usage and degrade application availability.
How do I fix CVE-2026-41310?
To fix CVE-2026-41310, upgrade to OpenTelemetry.Exporter.Zipkin version 1.15.3 or later.
What causes CVE-2026-41310?
CVE-2026-41310 is caused by unbounded key growth in the Zipkin exporter remote endpoint cache due to high-cardinality span attributes.
Which versions are affected by CVE-2026-41310?
Versions of OpenTelemetry.Exporter.Zipkin up to and including 1.15.2 are affected by CVE-2026-41310.
What are the implications of CVE-2026-41310?
The implications of CVE-2026-41310 include increased memory usage over time, which may lead to performance issues or application crashes.