Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-40891— OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling

Quick assessment

Affected
open-telemetry opentelemetry-dotnet
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenTelemetry .NET是OpenTelemetry公司的OpenTelemetry的.NET客户端。 OpenTelemetry .NET 1.13.1版本至1.15.2之前版本存在安全漏洞，该漏洞源于gRPC导出器在重试处理时解析服务器提供的grpc-status-details-bin trailer，可能导致内存过度分配和拒绝服务。

CVSS 5.3 · Medium EPSS 0.19% · P9

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-40891

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
OpenTelemetry dotnet: Unbounded `grpc-status-details-bin` parsing in OTLP/gRPC retry handling
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Vulnerability Title
OpenTelemetry .NET 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenTelemetry .NET是OpenTelemetry公司的OpenTelemetry的.NET客户端。 OpenTelemetry .NET 1.13.1版本至1.15.2之前版本存在安全漏洞，该漏洞源于gRPC导出器在重试处理时解析服务器提供的grpc-status-details-bin trailer，可能导致内存过度分配和拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
open-telemetry opentelemetry-dotnet >= 1.13.1, < 1.15.3 -
open-telemetry OpenTelemetry.Exporter.OpenTelemetryProtocol >= 1.13.1, < 1.15.3 -

II. Public POCs for CVE-2026-40891

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-40891

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-40891 (1)

Vendor Advisories for CVE-2026-40891 (1)

Same Patch Batch · open-telemetry · 2026-04-23 · 5 CVEs total

CVE-2026-41078 5.9 MEDIUM OpenTelemetry dotnet: Potential memory exhaustion via unbounded pooled-list sizing in Jaeg
CVE-2026-41173 5.9 MEDIUM Unbounded HTTP response body read in OpenTelemetry.Sampler.AWS
CVE-2026-40182 5.3 MEDIUM OpenTelemetry dotnet: OTLP exporter reads unbounded HTTP response bodies
CVE-2026-40894 5.3 MEDIUM OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation h

IV. Related Vulnerabilities

Same product: opentelemetry-dotnet
Same vendor: open-telemetry
Same weakness: CWE-789

V. Comments for CVE-2026-40891

No comments yet

Leave a comment