How severe is CVE-2026-45681?

CVE-2026-45681 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2026-45681 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-45681?

CVE-2026-45681 affects Opentelemetry Ebpf Instrumentation. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-45681?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-45681 have an EU (EUVD) identifier?

Yes. CVE-2026-45681 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33955.

When was CVE-2026-45681 published?

CVE-2026-45681 was published on 2026-06-02 and last updated on 2026-06-17.

CVE-2026-45681

CVE-2026-45681 is a medium-severity vulnerability in Opentelemetry Ebpf Instrumentation with a CVSS 3.x base score of 5.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.

Key facts

Severity: Medium (CVSS 3.x base score 5.9)
EPSS exploit prediction: 0% (21st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-33955
Weakness: CWE-125
Affected product: Opentelemetry Ebpf Instrumentation
Published: 2026-06-02
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-45681?: CVE-2026-45681 has a CVSS 3.x base score of 5.9, rated medium severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2026-45681 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (21st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-45681?: CVE-2026-45681 affects Opentelemetry Ebpf Instrumentation. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-45681?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-45681 have an EU (EUVD) identifier?: Yes. CVE-2026-45681 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-33955.
When was CVE-2026-45681 published?: CVE-2026-45681 was published on 2026-06-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:opentelemetry:ebpf_instrumentation:*:*:*:*:*:go:*:*

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