# CVE-2026-45685: OpenTelemetry eBPF Instrumentation: MongoDB parser panics on malformed wire messages

> A remote unauthenticated attacker can crash the telemetry agent by sending malformed MongoDB wire messages, causing denial of service.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 2 Jun 2026
- **Updated:** 2 Jun 2026
- **Also known as:** GHSA-j8p6-96vp-f3r9, GO-2026-5456

## What is CVE-2026-45685?

CVE-2026-45685 is a high-severity denial of service vulnerability in open-telemetry opentelemetry-ebpf-instrumentation, published on 2 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

OpenTelemetry eBPF Instrumentation provides eBPF instrumentation based on the OpenTelemetry standard. From version 0.1.0 to before version 0.9.0, malformed MongoDB wire messages can trigger uncaught panics in the MongoDB TCP parser, allowing a remote unauthenticated attacker to crash the telemetry agent and cause a denial of service. The parser operates on raw attacker-controlled network payloads before the input is fully validated, so a single crafted message can terminate telemetry collection for the affected process or node. This issue has been patched in version 0.9.0.

Weakness: CWE-704 (Incorrect Type Conversion or Cast), CWE-248 (Uncaught Exception), CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-45685?

3 open source packages ship an affected version, including go.opentelemetry.io/obi. It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `go.opentelemetry.io/obi` | Go | All versions | 0.9.0 |
| `go.opentelemetry.io/obi` | Go | All versions | 0.9.0 |
| `go.opentelemetry.io/obi` | Go | All versions | 0.9.0 |

Products: Opentelemetry Ebpf Instrumentation.

## How do I fix CVE-2026-45685?

Upgrade go.opentelemetry.io/obi to 0.9.0 or later.

## Is CVE-2026-45685 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45685 exists.

## Other vulnerabilities in open-telemetry opentelemetry-ebpf-instrumentation

- [CVE-2026-45678](https://insights.sbomify.com/CVE-2026-45678/): OpenTelemetry eBPF Instrumentation: Postgres BIND parsing can panic on malformed payloads (high 7.5)
- [CVE-2026-45686](https://insights.sbomify.com/CVE-2026-45686/): OpenTelemetry eBPF Instrumentation: Memcached payload length overflow can crash OBI (high 7.5)
- [CVE-2026-45679](https://insights.sbomify.com/CVE-2026-45679/): OpenTelemetry eBPF Instrumentation: Redis error text is exported in span status messages (medium 6.5)
- [CVE-2026-45680](https://insights.sbomify.com/CVE-2026-45680/): OpenTelemetry eBPF Instrumentation: Unbounded BPF internal metrics replay can exhaust CPU (medium 5.9)
- [CVE-2026-45681](https://insights.sbomify.com/CVE-2026-45681/): OpenTelemetry eBPF Instrumentation: CPU-mismatch fallback uses 256-byte buffer with 8KB size (medium 5.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-45685 and fix it if it is affected.

What it is: CVE-2026-45685 is a high-severity denial of service vulnerability in open-telemetry opentelemetry-ebpf-instrumentation, published on 2 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45685 exists.

Affected packages and fixed versions:
- go.opentelemetry.io/obi (Go): affected all versions; fixed in 0.9.0
- go.opentelemetry.io/obi (Go): affected all versions; fixed in 0.9.0
- go.opentelemetry.io/obi (Go): affected all versions; fixed in 0.9.0

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-45685/ (Markdown: https://insights.sbomify.com/CVE-2026-45685/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-45685
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45685
- OSV: https://osv.dev/vulnerability/CVE-2026-45685

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-45685/
Summaries are generated and may contain mistakes; the official description above is the record.