# CVE-2026-83347: Denial of service in Oracle Database Server

> An unauthenticated attacker can cause a complete denial of service in Oracle Net Services via network access, requiring user interaction.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 15 Sep 2026
- **Updated:** 18 Sep 2026
- **Also known as:** GHSA-rfc8-ww65-r55w

## What is CVE-2026-83347?

CVE-2026-83347 is a medium-severity denial of service vulnerability in Oracle Database Server, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Vulnerability in the Oracle Net Services component of Oracle Database Server.  Supported versions that are affected are 23.4.0-23.26.3. Easily exploitable vulnerability allows unauthenticated attacker with network access via TCPS to compromise Oracle Net Services.  Successful attacks require human interaction from a person other than the attacker. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Net Services. CVSS 3.1 Base Score 6.5 (Availability impacts).  CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H).

Weakness: CWE-400 (Uncontrolled Resource Consumption)

## Which versions are affected by CVE-2026-83347?


## How do I fix CVE-2026-83347?

No fix has been published for CVE-2026-83347 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-83347 being exploited?

There is no known exploitation of CVE-2026-83347 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-83347 and fix it if it is affected.

What it is: CVE-2026-83347 is a medium-severity denial of service vulnerability in Oracle Database Server, published on 15 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-83347 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-2026-83347/ (Markdown: https://insights.sbomify.com/CVE-2026-83347/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-83347
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-83347
- OSV: https://osv.dev/vulnerability/CVE-2026-83347

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-83347/
Summaries are generated and may contain mistakes; the official description above is the record.