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Vulnerability · Published Apr 23, 2026 · Assigned by GitHub_M

CVE-2026-40894OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers

Medium 5.3

In plain English

A medium-severity security flaw in OpenTelemetry.Api from open-telemetry. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.3Medium
Exploit odds (30 days)0.5%top 60.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

OpenTelemetry dotnet is a dotnet telemetry framework. In OpenTelemetry.Api 0.5.0-beta.2 to 1.15.2 and OpenTelemetry.Extensions.Propagators 1.3.1 to 1.15.2, The implementation details of the baggage, B3 and Jaeger processing code in the OpenTelemetry.Api and OpenTelemetry.Extensions.Propagators NuGet packages can allocate excessive memory when parsing which could create a potential denial of service (DoS) in the consuming application. This vulnerability is fixed in 1.15.3.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
NuGetopentelemetry.api1.15.3GHSA-g94r-2vxg-569j
NuGetopentelemetry.extensions.propagators1.15.3GHSA-g94r-2vxg-569j

Affected products (as reported)

VendorProductVersions
open-telemetry opentelemetry-dotnet >= 0.5.0-beta.2, < 1.15.3
open-telemetry OpenTelemetry.Api >= 0.5.0-beta.2, < 1.15.3
open-telemetry OpenTelemetry.Extensions.Propagators >= 1.3.1, < 1.15.3

Weakness: CWE-789 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References