CVE-2026-45684

OpenTelemetry eBPF Instrumentation: Log enricher writev path can overread and overwrite user buffers

State: Published
Severity: 4.9 Medium
Published: Jun 2, 2026
Updated: Jun 2, 2026
Reserved: May 12, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	4.9 Medium	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L	GitHub_M

Weaknesses

CWE-126 Buffer Over-read
CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
opentelemetry-ebpf-instrumentationopen-telemetry	>= 0.7.0, < 0.9.0Affected

References

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