# CVE-2026-47040: Auth bypass in Oracle Net Services

> Unauthenticated attackers can access critical data or cause denial of service in Oracle Net Services via network access.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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:** No
- **Published:** 21 Jul 2026
- **Updated:** 23 Jul 2026
- **Also known as:** GHSA-9vwg-jr6q-mqf6

## What is CVE-2026-47040?

CVE-2026-47040 is a critical authentication bypass vulnerability in Oracle Database Server, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Vulnerability in the Oracle Net Services component of Oracle Database Server.  Supported versions that are affected are 19.3-19.31, 21.3-21.22 and  23.4.0-23.26.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via Oracle Net to compromise Oracle Net Services.  Successful attacks of this vulnerability can result in  unauthorized access to critical data or complete access to all Oracle Net Services accessible data and unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Net Services. CVSS 3.1 Base Score 9.1 (Confidentiality and Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H).

Weakness: CWE-306 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-47040?

It affects 1 product.


Products: Oracle Database Server.

## How do I fix CVE-2026-47040?

No fix has been published for CVE-2026-47040 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-47040 being exploited?

There is no known exploitation of CVE-2026-47040 in the wild and no public exploit code.

## Other vulnerabilities in Oracle Database Server

- [CVE-2015-4863](https://insights.sbomify.com/CVE-2015-4863/): Other in n/a (critical 10.0)
- [CVE-2013-1534](https://insights.sbomify.com/CVE-2013-1534/): Other in n/a (critical 10.0)
- [CVE-2010-0071](https://insights.sbomify.com/CVE-2010-0071/): Other in n/a (critical 10.0)
- [CVE-2009-1979](https://insights.sbomify.com/CVE-2009-1979/): Other in n/a (critical 10.0)
- [CVE-2009-1985](https://insights.sbomify.com/CVE-2009-1985/): Other in n/a (critical 10.0)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-47040 and fix it if it is affected.

What it is: CVE-2026-47040 is a critical authentication bypass vulnerability in Oracle Database Server, published on 21 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-2026-47040 in the wild and no public exploit code.

Affected product: Oracle Database Server. 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-2026-47040/ (Markdown: https://insights.sbomify.com/CVE-2026-47040/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-47040
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-47040
- OSV: https://osv.dev/vulnerability/CVE-2026-47040

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-47040/
Summaries are generated and may contain mistakes; the official description above is the record.