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CVE-2026-40891

OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling

Published: Apr 23, 2026Updated: Apr 23, 2026 Sources: CVE List NVD
NVD MITRE
5.3CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:AAC:HPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:AAttack Vector
Adjacent
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High

Weaknesses

CWE-789

Affected Products

opentelemetry-dotnet
open-telemetry
OpenTelemetry.Exporter.OpenTelemetryProtocol
open-telemetry

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

References

https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-mr8r-92fq-pj8p
github.com
https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980
github.com
https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064
github.com

Timeline

Published
Apr 23, 2026
Last Updated
Apr 23, 2026

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