GHSA-q834-8qmm-v933

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Source
https://github.com/advisories/GHSA-q834-8qmm-v933
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-q834-8qmm-v933/GHSA-q834-8qmm-v933.json
JSON Data
https://api.test.osv.dev/v1/vulns/GHSA-q834-8qmm-v933
Aliases
Published
2026-04-23T21:26:10Z
Modified
2026-04-23T21:34:56.709922Z
Severity
  • 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
OpenTelemetry dotnet: OTLP exporter reads unbounded HTTP response bodies
Details

Summary

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.

Details

https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564 introduced a change to read the response body when a non-200 HTTP status code is received when exporting telemetry to aid debugging by operators so that the error response is included in the logs emitted by the exporter for both gRPC and HTTP/protobuf.

An unintended consequence of this change is that the response body is fully read into memory when received with no upper-bound.

This vulnerability was surfaced during the investigation of GHSA-w8rr-5gcm-pp58.

Impact

If an application using the OTLP exporter is configured to use a back-end/collector endpoint that is attacker-controlled (or a network attacker can MitM the connection) and an extremely large body is returned by the response the application could have its memory exhausted and create a denial-of-service condition.

Mitigation

The application's configured back-end/collector endpoint needs to behave maliciously. If the collector/back-end is a well-behaved implementation response bodies should not be excessively large if a request error occurs.

Workarounds

None known.

Remediation

#7017 updates the OTLP exporter for both gRPC and HTTP to:

  • Limit the number of bytes read from the response body in an error condition to 4MiB (see https://github.com/open-telemetry/opentelemetry-proto/pull/781);
  • Only attempt to read the response body if OpenTelemetry error logging is enabled.
Database specific 
{
    "cwe_ids": [
        "CWE-789"
    ],
    "github_reviewed_at": "2026-04-23T21:26:10Z",
    "github_reviewed": true,
    "severity": "MODERATE",
    "nvd_published_at": "2026-04-23T18:16:28Z"
}
References

Affected packages

NuGet / OpenTelemetry.Exporter.OpenTelemetryProtocol

Package

Name
OpenTelemetry.Exporter.OpenTelemetryProtocol
View open source insights on deps.dev
Purl
pkg:nuget/OpenTelemetry.Exporter.OpenTelemetryProtocol

Affected ranges

Type
ECOSYSTEM
Events
Introduced
1.13.1
Fixed
1.15.2

Affected versions

1.*
1.13.1
1.14.0
1.15.0
1.15.1

Database specific

source 
"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-q834-8qmm-v933/GHSA-q834-8qmm-v933.json"