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TI-2026-33423 Aliases CVE-2026-45681GHSA-r6c9-g6q5-qrf9

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

Priority MEDIUM 60CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-125 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00287 21st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed opentelemetry-ebpf-instrumentation (open-telemetry): 0.9.0go.opentelemetry.io/obi (Go): 0.9.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
open-telemetryopentelemetry-ebpf-instrumentationbefore 0.9.00.9.0Patch availableCNA
—go.opentelemetry.io/obi (Go)before 0.9.00.9.0Patch availableGHSA-r6c9-g6q5-qrf9
  • opentelemetry-ebpf-instrumentation Vendoropen-telemetry Affected before 0.9.0 Fixed in 0.9.0 Patch available CNA
  • go.opentelemetry.io/obi (Go) Vendor— Affected before 0.9.0 Fixed in 0.9.0 Patch available GHSA-r6c9-g6q5-qrf9

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:opentelemetry:ebpf_instrumentation:*:*:*:*:*:go:*:*before 0.9.0Vulnerableopen-telemetry
  • cpe:2.3:a:opentelemetry:ebpf_instrumentation:*:*:*:*:*:go:*:* Versions before 0.9.0 Vulnerable ·open-telemetry

Remediation

  • Fix · CNA opentelemetry-ebpf-instrumentation (open-telemetry) Fixed in 0.9.0
  • Fix · GHSA-r6c9-g6q5-qrf9 go.opentelemetry.io/obi (Go) Fixed in 0.9.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-45681
  2. 2026-10-03 Alias added: GHSA-r6c9-g6q5-qrf9

References

Exploit 1

Advisory 1

Other 2

  • TI-2026-33428 OpenTelemetry eBPF Instrumentation: Memcached payload length overflow can crash OBI CVSS 3.1HIGH 7.5
  • TI-2026-33427 OpenTelemetry eBPF Instrumentation: MongoDB parser panics on malformed wire messages CVSS 3.1HIGH 7.5
  • TI-2026-33420 OpenTelemetry eBPF Instrumentation: Postgres BIND parsing can panic on malformed payloads CVSS 3.1HIGH 7.5
  • TI-2026-33421 OpenTelemetry eBPF Instrumentation: Redis error text is exported in span status messages CVSS 3.1MEDIUM 6.5
  • TI-2026-33422 OpenTelemetry eBPF Instrumentation: Unbounded BPF internal metrics replay can exhaust CPU CVSS 3.1HIGH 7.5
  • TI-2026-33424 OpenTelemetry eBPF Instrumentation: CappedConcurrentHashMap leaks keys after removals CVSS 3.1MEDIUM 5.5
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences