CVE-2026-41433 OpenTelemetry eBPF Instrumentation: Privileged Java agent injection allows arbitrary host file overwrite via untrusted TMPDIR
A local attacker can overwrite arbitrary host files via unsafe Java agent injection when OpenTelemetry eBPF instrumentation runs with elevated privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41433?
CVE-2026-41433 is a high-severity path traversal vulnerability in open-telemetry opentelemetry-ebpf-instrumentation, published on 24 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-41433?
3 open source packages ship an affected version, including go.opentelemetry.io/obi. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
go.opentelemetry.io/obi Go | From 0.4.0 | 0.8.0 |
go.opentelemetry.io/obi Go | From 0.4.0 | 0.8.0 |
go.opentelemetry.io/obi Go | From 0.4.0 | 0.8.0 |
Products include Opentelemetry Opentelemetry Ebpf Instrumentation.
How do I fix CVE-2026-41433?
Upgrade go.opentelemetry.io/obi to 0.8.0 or later.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-41433 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41433 exists.
Sources
Also known as GHSA-8gmg-3w2q-65f4, GO-2026-5253.