OpenTelemetry .NET Zipkin exporter has unbounded remote endpoint cache leading to memory growth
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-400.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| open-telemetry | opentelemetry-dotnet | up to 1.15.2 | — | No fix listed | CNA |
| — | OpenTelemetry.Exporter.Zipkin (NuGet) | before 1.15.3 | 1.15.3 | Patch available | GHSA-88hf-wf7h-7w4m |
- opentelemetry-dotnet Vendoropen-telemetry Affected up to 1.15.2 Fixed in — No fix listed CNA
- OpenTelemetry.Exporter.Zipkin (NuGet) Vendor— Affected before 1.15.3 Fixed in 1.15.3 Patch available GHSA-88hf-wf7h-7w4m
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:opentelemetry:opentelemetry.exporter.zipkin:*:*:*:*:*:.net:*:* | before 1.15.3 | Vulnerable | open-telemetry |
- cpe:2.3:a:opentelemetry:opentelemetry.exporter.zipkin:*:*:*:*:*:.net:*:* Versions before 1.15.3 Vulnerable ·open-telemetry
Remediation
- Fix · GHSA-88hf-wf7h-7w4m OpenTelemetry.Exporter.Zipkin (NuGet) Fixed in 1.15.3 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2026-41310
- 2026-10-03 Alias added: GHSA-88hf-wf7h-7w4m
References
Advisory 2
Sources
- CVE-2026-41310 · CVE Program
- CVE-2026-41310 · NVD
- FIRST EPSS
- GHSA-88hf-wf7h-7w4m · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences