# CVE-2026-73445: Security Advisory 0167

> An incorrect authorization policy may become active during a gRPC stream, potentially bypassing intended security controls on Arista EOS devices.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 16 Sep 2026
- **Updated:** 16 Sep 2026
- **Also known as:** GHSA-v35v-w3pj-vq65

## What is CVE-2026-73445?

CVE-2026-73445 is a medium-severity authentication bypass vulnerability in Arista Networks EOS, published on 16 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

On affected platforms running Arista EOS, an issue with the gRPC Network Security Interface (gNSI) Authz Rotate RPC may cause an incorrect Authz policy which was uploaded in the ongoing RPC stream to become active. This does not affect Bootz.

This issue was discovered internally by Arista and the company is not aware of any malicious uses of this issue in customer networks.

Weakness: CWE-20 (Improper Input Validation)

## Which versions are affected by CVE-2026-73445?


## How do I fix CVE-2026-73445?

No fix has been published for CVE-2026-73445 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-73445 being exploited?

There is no known exploitation of CVE-2026-73445 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-73445 and fix it if it is affected.

What it is: CVE-2026-73445 is a medium-severity authentication bypass vulnerability in Arista Networks EOS, published on 16 Sep 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-73445 in the wild and no public exploit code.

Affected product: Arista Networks EOS. No package-level version data is available, so check the vendor advisory linked from the reference page.

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-2026-73445/ (Markdown: https://insights.sbomify.com/CVE-2026-73445/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-73445
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-73445
- OSV: https://osv.dev/vulnerability/CVE-2026-73445

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-73445/
Summaries are generated and may contain mistakes; the official description above is the record.