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CVE-2026-40182

22
FAUCET Score

OpenTelemetry dotnet is a dotnet telemetry framework. From 1.13.1 to before 1.15.2, When exporting telemetry to a back-end/collector over gRPC or HTTP using OpenTelemetry Protocol format (OTLP), if the request results in a unsuccessful request (i.e. HTTP 4xx or 5xx), the response is read into memory with no upper-bound on the number of bytes consumed. This could cause memory exhaustion in the consuming application if the configured back-end/collector endpoint is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response. This vulnerability is fixed in 1.15.2.

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

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.13.1, < 1.15.2CPE matchmatch criteria
cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:.net:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
ADJACENT_NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.30%
Probability of exploitation in next 30 days
EPSS Percentile
22.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0030 is in the 3rd percentile among its peer group of 19,956 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 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 (1)

nugetpatch availablevia ghsa
Product: OpenTelemetry.Exporter.OpenTelemetryProtocolFixed in: 1.15.2

Vendor Advisories (1)

nugetGHSA-q834-8qmm-v933medium

OpenTelemetry dotnet: OTLP exporter reads unbounded HTTP response bodies

Apr 23, 2026

References

github.com / open-telemetry/opentelemetry-dotnet/pull/6564
Issue TrackingPatch
github.com / open-telemetry/opentelemetry-dotnet/pull/7017
Issue TrackingPatch
github.com / open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-q834-8qmm-v933
Vendor Advisory
github.com / open-telemetry/opentelemetry-proto/pull/781
Issue Tracking