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    CVE-2026-40891

    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.

    Published:Apr 23, 2026
    Last Modified:Apr 29, 2026
    EPS:Apr 23, 2026
    EPSS Score:0.00018
    CVSS Score:5.3

    Affected Products

    Vendor
    Opentelemetry
    Product
    Opentelemetry
    Vendor
    Opentelemetry
    Product
    Opentelemetry-dotnet
    Vendor
    Opentelemetry
    Product
    Opentelemetry.exporter.opentelemetryprotocol

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2026-44967 (CVSS 5.3) — OpenTelemetry-cpp is the C++ implementation of OpenTelemetry. Prior to release 1.27.0, the OTLP HTTP exporters…
    CVE-2026-41078 (CVSS 5.9) — OpenTelemetry dotnet is a dotnet telemetry framework. In 1.6.0-rc.1 and earlier, OpenTelemetry.Exporter.Jaeger…
    CVE-2026-40894 (CVSS 5.3) — OpenTelemetry dotnet is a dotnet telemetry framework. In OpenTelemetry.Api 0.5.0-beta.2 to 1.15.2 and OpenTele…
    CVE-2026-40182 (CVSS 5.3) — OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry t…
    CVE-2026-39883 (CVSS 7.3) — OpenTelemetry-Go is the Go implementation of OpenTelemetry. From 1.15.0 to 1.42.0, the fix for CVE-2026-24051 …
    CVE-2026-39882 (CVSS 5.3) — OpenTelemetry-Go is the Go implementation of OpenTelemetry. Prior to 1.43.0, the otlp HTTP exporters (traces/m…
    CVE-2026-29181 (CVSS 7.5) — OpenTelemetry-Go is the Go implementation of OpenTelemetry. From 1.36.0 to 1.40.0, multi-value baggage: header…
    CVE-2026-24051 (CVSS 7) — OpenTelemetry-Go is the Go implementation of OpenTelemetry. The OpenTelemetry Go SDK in version v1.20.0-1.39.0…
    CVE-2024-36129 (CVSS 8.2) — The OpenTelemetry Collector offers a vendor-agnostic implementation on how to receive, process and export tele…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High