Medium 5.3Published May 6, 2026

CVE-2026-41310OpenTelemetry .NET Zipkin exporter has unbounded remote endpoint cache leading to memory growth

Updated under an hour ago (Oct 26, 2026, 6:23 AM ET)

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It affects open-telemetry opentelemetry-dotnet and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 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.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-770, CWE-400
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: May 7, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

open-telemetry opentelemetry-dotnet open_telemetry:opentelemetry_dotnet (from the name)	through 1.15.2	CNA record
opentelemetry opentelemetry.exporter.zipkin opentelemetry:opentelemetry.exporter.zipkin	before 1.15.3	NVD

References

https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-88hf-wf7h-7w4mx-refsource-confirm, vendor-advisory
https://github.com/open-telemetry/opentelemetry-dotnet/pull/7081x-refsource-misc, issue-tracking

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.