CVE-2026-40891

MEDIUM EPSS 9.1%
Published Apr 23, 20262mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Medium
Find Similar
Published Apr 23, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.3
Exploitability
1.6
Impact
3.6
Vector string
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Adjacent
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
9.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-789

Affected Products 1

VendorProductVersionRange
opentelemetryopentelemetry*≥1.13.1  –  <1.15.3

References 3

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

Remediation

  • github.com https://github.com/open-telemetry/opentelemetry-dotnet/pull/5980
    Issue TrackingPatch
  • github.com https://github.com/open-telemetry/opentelemetry-dotnet/pull/7064
    Issue TrackingPatch