Resource exhaustion in Open-Telemetry Opentelemetry-Dotnet
CVE-2026-41310
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.
EPSS exploit prediction
EPSS: 0.004 (32.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Open-Telemetry Opentelemetry-Dotnet — versions <= 1.15.2
- Opentelemetry Opentelemetry.exporter.zipkin
Weakness classification (CWE)
References
- github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-88hf-wf… (Vendor Advisory)
- github.com/open-telemetry/opentelemetry-dotnet/pull/7081 (Issue Tracking)
Frequently asked questions
- What is CVE-2026-41310?
- CVE-2026-41310 is a medium-severity vulnerability in Open-Telemetry Opentelemetry-Dotnet, classified under Uncontrolled Resource Consumption. CVSS score: 5.3/10. Published 2026-05-06.
- How severe is CVE-2026-41310?
- Medium severity. CVSS v3 base score is 5.3 out of 10.