Medium 5.3Published Apr 23, 2026

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

Updated under an hour ago (Oct 27, 2026, 2:40 AM ET)

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It affects open-telemetry opentelemetry-dotnet and 5 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for open-telemetry opentelemetry-dotnet

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-789
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Apr 23, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

open-telemetry opentelemetry-dotnet open_telemetry:opentelemetry_dotnet (from the name)	from 0.5.0-beta.2, < 1.15.3	CNA record
open-telemetry OpenTelemetry.Api open_telemetry:opentelemetry.api (from the name)	from 0.5.0-beta.2, < 1.15.3	CNA record
open-telemetry OpenTelemetry.Extensions.Propagators open_telemetry:opentelemetry.extensions.propagators (from the name)	from 1.3.1, < 1.15.3	CNA record
opentelemetry opentelemetry opentelemetry:opentelemetry	from 0.5.0 before 1.15.3	NVD
opentelemetry opentelemetry.api opentelemetry:opentelemetry.api	from 0.5.0 before 1.15.3	NVD
opentelemetry opentelemetry.extensions.propagators opentelemetry:opentelemetry.extensions.propagators	after 1.3.0 before 1.15.3	NVD

References

References

https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569j	x-refsource-confirm, mitigation, vendor-advisory
https://github.com/open-telemetry/opentelemetry-dotnet/pull/1048	x-refsource-misc, issue-tracking, patch
https://github.com/open-telemetry/opentelemetry-dotnet/pull/3244	x-refsource-misc, issue-tracking, patch
https://github.com/open-telemetry/opentelemetry-dotnet/pull/3309	x-refsource-misc, issue-tracking, patch
https://github.com/open-telemetry/opentelemetry-dotnet/pull/533	x-refsource-misc, issue-tracking, patch
https://github.com/open-telemetry/opentelemetry-dotnet/pull/7061	x-refsource-misc, issue-tracking, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.