VULNERABILITY INTELLIGENCE
CVE-2026-40891
CVSS score5.3 MEDIUM
EPSS probability0.19%
CISA KEVNot currently listed
Published2026-04-23
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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.
Weakness classification
- CWE-789: Memory Allocation with Excessive Size Value
Primary references
- security-advisories@github.com — Issue Tracking, Patch
- security-advisories@github.com — Issue Tracking, Patch
- security-advisories@github.com — Mitigation, Vendor Advisory