CVE-2026-40891

Published: Apr 23, 2026Modified: Jun 17, 2026

5.3

Vector

CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploitability: 1.6 / Impact: 3.6

Source: NVD

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.

Affected (1)

Products: Opentelemetry: Opentelemetry

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Opentelemetry Opentelemetry	From 1.13.1 to 1.15.3

Related CWEs

Memory Allocation with Excessive Size Value

The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.

References (3)

https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980

Source: security-advisories@github.com

Issue TrackingPatch

https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064

Source: security-advisories@github.com

Issue TrackingPatch

https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p

Source: security-advisories@github.com

MitigationVendor Advisory

Timeline

No history available yet.