Vulnerability · Published Jun 2, 2026 · Assigned by GitHub_M
CVE-2026-45681OpenTelemetry eBPF Instrumentation: CPU-mismatch fallback uses 256-byte buffer with 8KB size
Medium 5.9
In plain English
A medium-severity out-of-bounds read in opentelemetry-ebpf-instrumentation from open-telemetry. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
OpenTelemetry eBPF Instrumentation provides eBPF instrumentation based on the OpenTelemetry standard. Prior to version 0.9.0, the per-CPU message-buffer fallback path uses a 256-byte backup buffer but preserves the original payload size, which can be up to 8KB. If a CPU mismatch occurs, OBI can read beyond the fallback buffer and leak adjacent memory into telemetry. This issue has been patched in version 0.9.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | go.opentelemetry.io/obi | 0.9.0 | GHSA-r6c9-g6q5-qrf9 |
| Go | go.opentelemetry.io/obi | 0.9.0 | GO-2026-5610 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| open-telemetry | opentelemetry-ebpf-instrumentation | < 0.9.0 |
Weakness: CWE-125, CWE-130 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N