Vulnerability · Published Jun 2, 2026 · Assigned by GitHub_M
CVE-2026-45684OpenTelemetry eBPF Instrumentation: Log enricher writev path can overread and overwrite user buffers
Medium 4.9
In plain English
A medium-severity out-of-bounds write 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 0.2% (higher than 7% 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. From version 0.7.0 to before version 0.9.0, OBI's log enricher mishandles writev buffers by reading only the first iovec entry but using the total iov_iter.count as the copy length. When log injection is enabled, a crafted multi-segment writev call can make OBI read and overwrite memory beyond the first segment. 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-vvmg-8mjr-g6q3 |
| Go | go.opentelemetry.io/obi | 0.9.0 | GO-2026-5677 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| open-telemetry | opentelemetry-ebpf-instrumentation | >= 0.7.0, < 0.9.0 |
Weakness: CWE-126, CWE-787 · Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L