Memory disclosure via oversized fallback-buffer read
Published Jun 2, 2026 · Updated Jun 2, 2026
Out-of-bounds read in OpenTelemetry eBPF Instrumentation before 0.9.0 allows remote attackers to expose adjacent memory through telemetry. On a CPU mismatch, k_tracer selects the 256-byte fallback_buf but passes its unchanged real_size, which can reach 8KB, to HTTP large-buffer capture. Reachability requires context propagation, the tpinjector sock_msg path, nonzero HTTP large-buffer capture, and a CPU mismatch; the consequence is export of unrelated memory.
Summary
What happened
Out-of-bounds read in OpenTelemetry eBPF Instrumentation before 0.9.0 allows remote attackers to expose adjacent memory through telemetry. On a CPU mismatch, k_tracer selects the 256-byte fallback_buf but passes its unchanged real_size, which can reach 8KB, to HTTP large-buffer capture. Reachability requires context propagation, the tpinjector sock_msg path, nonzero HTTP large-buffer capture, and a CPU mismatch; the consequence is export of unrelated memory.
The record
- CVE
- CVE-2026-45681
- Published
- Jun 2, 2026
- Updated
- Jun 2, 2026
- Vendor
- OpenTelemetry
- Product
- OpenTelemetry eBPF Instrumentation
- Classifications
- CWE-125, CWE-130, T1005
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 2, 2026CVE publishedPublication date reported by the CVE source.
- Jun 2, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 0.9.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- ASan fallback-buffer over-read reproducerproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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