# CVE-2026-40140: High-Severity Pre-Authentication Vulnerability in BeyondTrust Remote Support and Privileged Remote Access

> Unauthenticated remote attackers can cause denial of service in BeyondTrust Remote Support and Privileged Remote Access via insufficient input validation.

- **Severity:** High 8.7 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 6 Jul 2026
- **Updated:** 7 Jul 2026
- **Also known as:** GHSA-8v46-5p7g-p46j

## What is CVE-2026-40140?

CVE-2026-40140 is a high-severity denial of service vulnerability in BeyondTrust Privileged Remote Access, published on 6 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

BeyondTrust Remote Support and Privileged Remote Access contain a high-severity pre-authentication vulnerability in the network communication subsystem. Insufficient validation of client-supplied input may allow an unauthenticated remote attacker to trigger a denial-of-service condition affecting appliance availability.

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2026-40140?

It affects 2 products.


Products: Beyondtrust Privileged Remote Access, Beyondtrust Remote Support.

## How do I fix CVE-2026-40140?

No fix has been published for CVE-2026-40140 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-40140 being exploited?

There is no known exploitation of CVE-2026-40140 in the wild and no public exploit code.

## Other vulnerabilities in BeyondTrust Privileged Remote Access

- [CVE-2026-1731](https://insights.sbomify.com/CVE-2026-1731/): BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA) OS Command Injection (critical 9.9, exploited in the wild)
- [CVE-2024-12356](https://insights.sbomify.com/CVE-2024-12356/): BeyondTrust Privileged Remote Access (PRA) and Remote Support (RS) Command Injection Vulnerability (critical 9.8, exploited in the wild)
- [CVE-2024-12686](https://insights.sbomify.com/CVE-2024-12686/): BeyondTrust Privileged Remote Access (PRA) and Remote Support (RS) OS Command Injection (medium 6.6, exploited in the wild)
- [CVE-2023-4310](https://insights.sbomify.com/CVE-2023-4310/): Command injection in Privileged Remote Access (PRA) (critical 9.8)
- [CVE-2026-40138](https://insights.sbomify.com/CVE-2026-40138/): Critical Pre-Authentication Vulnerability in BeyondTrust Remote Support and Privileged Remote Access (critical 9.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-40140 and fix it if it is affected.

What it is: CVE-2026-40140 is a high-severity denial of service vulnerability in BeyondTrust Privileged Remote Access, published on 6 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-40140 in the wild and no public exploit code.

Affected product: BeyondTrust Privileged Remote Access. 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-2026-40140/ (Markdown: https://insights.sbomify.com/CVE-2026-40140/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-40140
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40140
- OSV: https://osv.dev/vulnerability/CVE-2026-40140

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-40140/
Summaries are generated and may contain mistakes; the official description above is the record.