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CVE-2026-40894

OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers

MEDIUM
5.3
CVSS Score
Published: April 23, 2026 at 06:03 PM UTC
Updated: October 26, 2026 at 10:10 PM UTC
6 products affected across 1 vendorOpentelemetryOpentelemetry.extensions.propagatorsOpentelemetry.api

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Opentelemetry· Opentelemetrynuget
95%
0.5.0 ≤ v < 1.15.3
Opentelemetry.api· Opentelemetrynuget
95%
0.5.0 ≤ v < 1.15.3
Opentelemetry.extensions.propagators· Opentelemetry
95%
1.3.0 < v < 1.15.3
OpenTelemetry.Api· Opentelemetry
90%
0.5.0-beta.2 ≤ v < 1.15.3
Affected range stops below 1.15.3, so it looks safe — our inference, not a vendor statement
OpenTelemetry.Extensions.Propagators· Opentelemetry
90%
1.3.1 ≤ v < 1.15.3
Affected range stops below 1.15.3, so it looks safe — our inference, not a vendor statement
Opentelemetry .NET· Opentelemetry
90%
0.5.0-beta.2 ≤ v < 1.15.3
Affected range stops below 1.15.3, so it looks safe — our inference, not a vendor statement

References (6)

x_refsource_CONFIRMMitigationVendor Advisory
Source: cverecord
https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569j
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/open-telemetry/opentelemetry-dotnet/pull/1048
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/open-telemetry/opentelemetry-dotnet/pull/3244
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/open-telemetry/opentelemetry-dotnet/pull/3309
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/open-telemetry/opentelemetry-dotnet/pull/533
x_refsource_MISCIssue TrackingPatch
Source: cverecord
https://github.com/open-telemetry/opentelemetry-dotnet/pull/7061

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusANALYZED
CWE
CWE-789

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