CVE-2026-45684 OpenTelemetry eBPF Instrumentation: Log enricher writev path can overread and overwrite user buffers
Attackers can trigger memory corruption via crafted writev calls when log injection is enabled, potentially leading to code execution or data modification.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45684?
CVE-2026-45684 is a medium-severity memory corruption vulnerability in open-telemetry opentelemetry-ebpf-instrumentation, published on 2 Jun 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 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.
Which versions are affected by CVE-2026-45684?
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 0.7.0 | 0.9.0 |
go.opentelemetry.io/obi Go | From 0.7.0 | 0.9.0 |
go.opentelemetry.io/obi Go | From 0.7.0 | 0.9.0 |
Products include Opentelemetry Ebpf Instrumentation.
How do I fix CVE-2026-45684?
Upgrade go.opentelemetry.io/obi to 0.9.0 or later.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-45684 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45684 exists.
Other vulnerabilities in open-telemetry opentelemetry-ebpf-instrumentation
- CVE-2026-45678 OpenTelemetry eBPF Instrumentation: Postgres BIND parsing can panic on malformed payloads
- CVE-2026-45685 OpenTelemetry eBPF Instrumentation: MongoDB parser panics on malformed wire messages
- CVE-2026-45686 OpenTelemetry eBPF Instrumentation: Memcached payload length overflow can crash OBI
- CVE-2026-45679 OpenTelemetry eBPF Instrumentation: Redis error text is exported in span status messages
- CVE-2026-45680 OpenTelemetry eBPF Instrumentation: Unbounded BPF internal metrics replay can exhaust CPU
Sources
Also known as GHSA-vvmg-8mjr-g6q3, GO-2026-5677.