OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers

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Summary

CVECVE-2026-40894
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-23 19:17:28 UTC
Updated2026-04-23 19:17:28 UTC
DescriptionOpenTelemetry 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.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Problem Types: CWE-789 | CWE-789 CWE-789: Memory Allocation with Excessive Size Value

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Open-telemetry Opentelemetry-dotnet affected >= 0.5.0-beta.2, < 1.15.3 Not specified
CNA Open-telemetry OpenTelemetry.Api affected >= 0.5.0-beta.2, < 1.15.3 Not specified
CNA Open-telemetry OpenTelemetry.Extensions.Propagators affected >= 1.3.1, < 1.15.3 Not specified

References

ReferenceSourceLinkTags
github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-... [email protected] github.com
github.com/open-telemetry/opentelemetry-dotnet/pull/533 [email protected] github.com
github.com/open-telemetry/opentelemetry-dotnet/pull/3309 [email protected] github.com
github.com/open-telemetry/opentelemetry-dotnet/pull/1048 [email protected] github.com
github.com/open-telemetry/opentelemetry-dotnet/pull/7061 [email protected] github.com
github.com/open-telemetry/opentelemetry-dotnet/pull/3244 [email protected] github.com
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