Medium 5.3Published Apr 23, 2026

CVE-2026-40182OpenTelemetry dotnet: OTLP exporter reads unbounded HTTP response bodies

Updated under an hour ago (Oct 27, 2026, 4:30 AM ET)

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It affects open-telemetry opentelemetry-dotnet and 1 other product. 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. 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.

CVSS: 5.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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 1.13.1, < 1.15.2	CNA record
opentelemetry opentelemetry opentelemetry:opentelemetry	from 1.13.1 before 1.15.2	NVD

References

References

https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-q834-8qmm-v933	x-refsource-confirm, vendor-advisory
https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564	x-refsource-misc, issue-tracking, patch
https://github.com/open-telemetry/opentelemetry-dotnet/pull/7017	x-refsource-misc, issue-tracking, patch
https://github.com/open-telemetry/opentelemetry-proto/pull/781	x-refsource-misc, issue-tracking

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.