CVE-2026-40891
Published:April 23, 2026
Updated:April 26, 2026
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.
Affected Packages
OpenTelemetry.Exporter.OpenTelemetryProtocol (DOT_NET):
Affected version(s) >=1.13.1.1811 <1.15.3Fix Suggestion:
Update to version 1.15.3https://github.com/open-telemetry/opentelemetry-dotnet.git (GITHUB):
Affected version(s) >=core-1.13.1 <core-1.15.3Fix Suggestion:
Update to version core-1.15.3opentelemetry.exporter.opentelemetryprotocol (NUGET):
Affected version(s) >=1.13.1 <1.15.3Fix Suggestion:
Update to version 1.15.3Related Resources (5)
Do you need more information?
Contact UsCVSS v4
Base Score:
6
Attack Vector
ADJACENT
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.3
Attack Vector
ADJACENT
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
Memory Allocation with Excessive Size Value
EPSS
Base Score:
0.01
