Buffer overflow in Open-Telemetry Opentelemetry-Ebpf-Instrumentation
CVE-2026-45684
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.002 (6.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 6th percentile — 6.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Open-Telemetry Opentelemetry-Ebpf-Instrumentation — versions >= 0.7.0, < 0.9.0
- Opentelemetry Ebpf Instrumentation
Weakness classification (CWE)
References
- github.com/open-telemetry/opentelemetry-ebpf-instrumentation/security/advisorie… (Exploit, Vendor Advisory)
- github.com/open-telemetry/opentelemetry-ebpf-instrumentation/releases/tag/v0.9.0 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-45684?
- CVE-2026-45684 is a medium-severity vulnerability in Open-Telemetry Opentelemetry-Ebpf-Instrumentation, classified under Buffer Over-read. CVSS score: 4.9/10. Published 2026-06-02.
- How severe is CVE-2026-45684?
- Medium severity. CVSS v3 base score is 4.9 out of 10.