OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-40894
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-23 19:17:28 UTC
Updated2026-04-28 19:34:26 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

EPSS: 0.000210000 probability, percentile 0.058840000 (date 2026-04-28)

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Opentelemetry Opentelemetry All All All All
Application Opentelemetry Opentelemetry.api All All All All
Application Opentelemetry Opentelemetry.extensions.propagators All All All All

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 Vendor Advisory, Mitigation
github.com/open-telemetry/opentelemetry-dotnet/pull/533 [email protected] github.com Issue Tracking, Patch
github.com/open-telemetry/opentelemetry-dotnet/pull/3309 [email protected] github.com Issue Tracking, Patch
github.com/open-telemetry/opentelemetry-dotnet/pull/1048 [email protected] github.com Issue Tracking, Patch
github.com/open-telemetry/opentelemetry-dotnet/pull/7061 [email protected] github.com Issue Tracking, Patch
github.com/open-telemetry/opentelemetry-dotnet/pull/3244 [email protected] github.com Issue Tracking, Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report