CVE-2026-45684 MEDIUM

CVE-2026-45684: OpenTelemetry eBPF Instrumentation: Log enricher writev path can overread and overwrite user buffers

Vendor Open-Telemetry
Product opentelemetry-ebpf-instrumentation
Weakness CWE-126
Published June 2, 2026
Last update June 2, 2026
View on NVD All CVEs

CVSS base score

4.9/10
Attack vector Local
Attack complexity High
Privileges required None
User interaction None
Confidentiality Low
Integrity Low

CVSS vector

CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

What the vulnerability does

01Description

OpenTelemetry eBPF Instrumentation provides eBPF instrumentation based on the OpenTelemetry standard. From version 0.7.0 to before version 0.9.0, OBI's log enricher mishandles writev buffers by reading only the first iovec entry but using the total iov_iter.count as the copy length. When log injection is enabled, a crafted multi-segment writev call can make OBI read and overwrite memory beyond the first segment. This issue has been patched in version 0.9.0.

Key dates

02Disclosure timeline

June 2, 2026 CVE published
June 2, 2026 Record updated