Out-of-bounds Read in Open-Telemetry Opentelemetry-Ebpf-Instrumentation
CVE-2026-45681
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.003 (19.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 20th percentile — 19.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/open-telemetry/opentelemetry-ebpf-instrumentation/security/advisorie… (Exploit, Vendor Advisory)
- github.com/open-telemetry/opentelemetry-ebpf-instrumentation/releases/tag/v0.9.0 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-45681?
- CVE-2026-45681 is a medium-severity vulnerability in Open-Telemetry Opentelemetry-Ebpf-Instrumentation, classified under Out-of-bounds Read. CVSS score: 5.9/10. Published 2026-06-02.
- How severe is CVE-2026-45681?
- Medium severity. CVSS v3 base score is 5.9 out of 10.