CVE-2026-45686 OpenTelemetry eBPF Instrumentation: Memcached payload length overflow can crash OBI
A remotely reachable integer overflow in the memcached parser allows attackers to crash the OpenTelemetry eBPF Instrumentation process, causing denial of service.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-45686?
CVE-2026-45686 is a high-severity vulnerability in open-telemetry opentelemetry-ebpf-instrumentation, published on 2 Jun 2026. An attacker can exploit it over the internet without logging in, 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, a remotely reachable integer overflow in OBI's memcached text protocol parser can crash the OBI process and cause denial of service. When parsing memcached storage commands such as set, add, replace, append, prepend, or cas, OBI accepts extremely large <bytes> values and adds the payload delimiter length without checking for overflow. A crafted request with <bytes> set to math.MaxInt or math.MaxInt-1 causes the computed payload length to wrap negative and triggers a runtime panic in LargeBufferReader.Peek. This issue has been patched in version 0.9.0.
Weakness: CWE-190
Which versions are affected by CVE-2026-45686?
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-2026-45686?
Upgrade go.opentelemetry.io/obi to 0.9.0 or later.
Is CVE-2026-45686 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45686 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-2026-45679 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
- CVE-2026-45681 OpenTelemetry eBPF Instrumentation: CPU-mismatch fallback uses 256-byte buffer with 8KB size
Sources
Also known as GHSA-43g7-cwr8-q3jh, GO-2026-5107.