CVE-2026-40182
OpenTelemetry dotnet: OTLP exporter reads unbounded HTTP response bodies
- Published
- Updated
- Reserved
- Assigned by
- GitHub_M
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 3.1 | Medium5.3 | CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | Medium5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.30% · top 77% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Weakness
Affected products
open-telemetry · opentelemetry-dotnet
- affected >= 1.13.1, < 1.15.2
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- NuGetOpenTelemetry.Exporter.OpenTelemetryProtocolGHSA-q834-8qmm-v933 (opens in a new tab)
References (4)
- https://github.com/open-telemetry/opentelemetry-dotnet/security/advisories/GHSA-q834-8qmm-v933 (opens in a new tab)x_refsource_CONFIRM
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/6564 (opens in a new tab)x_refsource_MISC
- https://github.com/open-telemetry/opentelemetry-dotnet/pull/7017 (opens in a new tab)x_refsource_MISC
- https://github.com/open-telemetry/opentelemetry-proto/pull/781 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-q834-8qmm-v933 (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-40182)Record last updated .