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
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| .NET (NuGet) | OpenTelemetry.Exporter.Zipkin | < 1.15.3 | 1.15.3 |
References
- https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-88hf-wf7h-7w4m
- https://nvd.nist.gov/vuln/detail/CVE-2026-41310
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/7081
- https://github.com/open-telemetry/opentelemetry-dotnet/commit/c724f4bd6fd88e9a599af1668bf7af9487155b62
- https://github.com/open-telemetry/opentelemetry-dotnet
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L- Weakness (CWE)
CWE-400, CWE-770- Platform
- .NET (NuGet)
- Package
OpenTelemetry.Exporter.Zipkin- Disclosed
- 28.04.2026
- Updated
- 11.10.2026 11:23
Sources and licenses
OSV / GitHub Advisory Database - GHSA-88hf-wf7h-7w4m - CC BY 4.0
Vulnerability history: OpenTelemetry.Exporter.Zipkin
All published vulnerabilities of this package (.NET (NuGet)), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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