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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-40894

21
FAUCET Score

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.

First published: Apr 23, 2026Last modified: Apr 23, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.5.0, < 1.15.3CPE matchmatch criteria
cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:.net:*:*
>= 0.5.0, < 1.15.3CPE matchmatch criteria
cpe:2.3:a:opentelemetry:opentelemetry.api:*:*:*:*:*:.net:*:*
> 1.3.0, < 1.15.3CPE matchmatch criteria
cpe:2.3:a:opentelemetry:opentelemetry.extensions.propagators:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.46%
Probability of exploitation in next 30 days
EPSS Percentile
37.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0046 is in the 23rd percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
nugetpatch availablevia ghsa
Product: OpenTelemetry.ApiFixed in: 1.15.3
nugetpatch availablevia ghsa
Product: OpenTelemetry.Extensions.PropagatorsFixed in: 1.15.3

Vendor Advisories (1)

nugetGHSA-g94r-2vxg-569jmedium

OpenTelemetry dotnet: Excessive memory allocation when parsing OpenTelemetry propagation headers

Apr 23, 2026

References

github.com / open-telemetry/opentelemetry-dotnet/pull/1048
Issue TrackingPatch
github.com / open-telemetry/opentelemetry-dotnet/pull/3244
Issue TrackingPatch
github.com / open-telemetry/opentelemetry-dotnet/pull/3309
Issue TrackingPatch
github.com / open-telemetry/opentelemetry-dotnet/pull/533
Issue TrackingPatch
github.com / open-telemetry/opentelemetry-dotnet/pull/7061
Issue TrackingPatch
github.com / open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-g94r-2vxg-569j
MitigationVendor Advisory