Vulnerability in Open-Telemetry Opentelemetry-Dotnet
CVE-2026-40182
OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed. This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response. This vulnerability is fixed in 1.15.2.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (45.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.3% 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: 0.006 · change: +0.003
Affected products
- Open-Telemetry Opentelemetry-Dotnet — versions >= 1.13.1, < 1.15.2
- Opentelemetry
Weakness classification (CWE)
References
- github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-q834-8q… (Vendor Advisory)
- github.com/open-telemetry/opentelemetry-dotnet/pull/6564 (Patch, Issue Tracking)
- github.com/open-telemetry/opentelemetry-dotnet/pull/7017 (Patch, Issue Tracking)
- github.com/open-telemetry/opentelemetry-proto/pull/781 (Issue Tracking)
Frequently asked questions
- What is CVE-2026-40182?
- CVE-2026-40182 is a medium-severity vulnerability in Open-Telemetry Opentelemetry-Dotnet, classified under CWE-789. CVSS score: 5.3/10. Published 2026-04-23.
- How severe is CVE-2026-40182?
- Medium severity. CVSS v3 base score is 5.3 out of 10.