What’s Vulnerable › Vulnerabilities

CVE-2026-45681: OpenTelemetry eBPF Instrumentation: CPU-mismatch fallback uses 256-byte buffer with 8KB size

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-02 · updated 2026-07-22
• Weakness: CWE-125

Description

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.

Affected products

• open-telemetry opentelemetry-ebpf-instrumentation: before 0.9.0 — fixed in 0.9.0

How to fix

Upgrade to a fixed version: open-telemetry opentelemetry-ebpf-instrumentation 0.9.0. Check the vendor advisory for mitigations.

References

• https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/releases/tag/v0.9.0
• https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/security/advisories/GHSA-r6c9-g6q5-qrf9
• https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/security/advisories/GHSA-r6c9-g6q5-qrf9

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