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
EPSS: 0.003 (20.8th percentile) — read the EPSS interpretation.
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.
Affected products
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Product, x_refsource_MISC, 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.