Memory Allocation with Excessive Size Value Affecting opentelemetry.api package, versions [0.5.0-beta.2,1.15.3)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DOTNET-OPENTELEMETRYAPI-16189068
- published24 Apr 2026
- disclosed23 Apr 2026
- creditMartin Costello
Introduced: 23 Apr 2026
NewCVE-2026-40894 (opens in a new tab)How to fix?
Upgrade OpenTelemetry.Api to version 1.15.3 or higher.
Overview
OpenTelemetry.Api is a package that application developers and library authors use to instrument their application/library.
Affected versions of this package are vulnerable to Memory Allocation with Excessive Size Value in the processing of propagation headers such as baggage, B3, and Jaeger. An attacker can cause excessive memory allocation leading to application resource exhaustion by sending specially crafted, excessively large or malformed propagation headers.
Workaround
This vulnerability can be mitigated by configuring appropriate HTTP request header limits or disabling baggage and/or trace propagation.