CVE-2026-40891
MEDIUMOpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling
Title source: cnaDescription
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.
References (3)
Core 3
Core References
X_Refsource_Misc x_refsource_misc
https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064
X_Refsource_Confirm x_refsource_confirm
https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p
X_Refsource_Misc x_refsource_misc
https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980
Scores
CVSS v3
5.3
EPSS
0.0019
EPSS Percentile
9.0%
Attack Vector
ADJACENT_NETWORK
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-789
Status
published
Products (4)
nuget/OpenTelemetry.Exporter.OpenTelemetryProtocol
1.13.1 - 1.15.3NuGet
open-telemetry/opentelemetry-dotnet
>= 1.13.1, < 1.15.3
open-telemetry/OpenTelemetry.Exporter.OpenTelemetryProtocol
>= 1.13.1, < 1.15.3
opentelemetry/opentelemetry
1.13.1 - 1.15.3
Published
Apr 23, 2026
Tracked Since
Apr 23, 2026