OpenTelemetry's Zipkin remote endpoint cache could grow without bounds and increase memory pressure
### 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](https://github.com/open-telemetry/opentelemetry-dotnet/pull/7081)
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-41310US | — | — | ||
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… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/open-telemetry/opentelemetry-dotnetPACKAGE
- https://github.com/open-telemetry/opentelemetry-dotnet/commit/c724f4bd6fd88e9a599af1668bf7af9487155b62WEB
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/7081WEB
- https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-88hf-wf7h-7w4mWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-41310ADVISORY
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