Medium severity5.3NVD Advisory· Published Apr 23, 2026· Updated Apr 29, 2026
CVE-2026-40891
CVE-2026-40891
Description
OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry over gRPC using the OpenTelemetry Protocol (OTLP), the exporter may parse a server-provided grpc-status-details-bin trailer during retry handling. Prior to the fix, a malformed trailer could encode an extremely large length-delimited protobuf field which was used directly for allocation, allowing excessive memory allocation and potential denial of service (DoS). This vulnerability is fixed in 1.15.2.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
OpenTelemetry.Exporter.OpenTelemetryProtocolNuGet | >= 1.13.1, < 1.15.3 | 1.15.3 |
Affected products
5- cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:.net:*:*Range: >=1.13.1,<1.15.3
- osv-coords4 versionspkg:apk/chainguard/azure-functions-hostpkg:apk/chainguard/kubernetes-reflectorpkg:apk/wolfi/kubernetes-reflectorpkg:nuget/opentelemetry.exporter.opentelemetryprotocol
< 4.1051.100-r0+ 3 more
- (no CPE)range: < 4.1051.100-r0
- (no CPE)range: < 10.0.39-r1
- (no CPE)range: < 10.0.39-r1
- (no CPE)range: >= 1.13.1, < 1.15.3
Patches
Vulnerability mechanics
References
5- github.com/open-telemetry/opentelemetry-dotnet/pull/5980nvdIssue TrackingPatchWEB
- github.com/open-telemetry/opentelemetry-dotnet/pull/7064nvdIssue TrackingPatchWEB
- github.com/advisories/GHSA-mr8r-92fq-pj8pghsaADVISORY
- github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8pnvdVendor AdvisoryMitigationWEB
- nvd.nist.gov/vuln/detail/CVE-2026-40891ghsaADVISORY
News mentions
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