# CVE-2023-50495: Null dereference in n/a

> A segmentation fault in NCurse allows attackers to cause a denial of service via the _nc_wrap_entry component.

- **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:** Yes
- **Published:** 12 Dec 2023
- **Updated:** 15 Oct 2026
- **Also known as:** AZL-32177, CLSA-2024-1716272110, DEBIAN-CVE-2023-50495, ECHO-f593-31a2-90df, GHSA-8p5h-3mcg-frjf, OESA-2023-1969, ROOT-OS-DEBIAN-11-CVE-2023-50495, ROOT-OS-DEBIAN-12-CVE-2023-50495, ROOT-OS-UBUNTU-2204-CVE-2023-50495, SUSE-SU-2023:4891-1, SUSE-SU-2023:4892-1, UBUNTU-CVE-2023-50495, USN-6684-1

## What is CVE-2023-50495?

CVE-2023-50495 is a medium-severity vulnerability in n/a, published on 12 Dec 2023. 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

NCurse v6.4-20230418 was discovered to contain a segmentation fault via the component _nc_wrap_entry().

## Which versions are affected by CVE-2023-50495?

It affects 1 product.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `ncurses` | SUSE:Linux Enterprise Micro 5.1 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | SUSE:Linux Enterprise Micro 5.2 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | SUSE:Linux Enterprise Micro 5.3 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | SUSE:Linux Enterprise Micro 5.4 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | SUSE:Linux Enterprise Micro 5.5 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | SUSE:Linux Enterprise Module for Basesystem 15 SP4 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | SUSE:Linux Enterprise Module for Basesystem 15 SP5 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | SUSE:Linux Enterprise Module for Development Tools 15 SP4 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | SUSE:Linux Enterprise Module for Development Tools 15 SP5 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | SUSE:Linux Enterprise Module for Legacy 15 SP4 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | SUSE:Linux Enterprise Module for Legacy 15 SP5 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | SUSE:Linux Enterprise Server 12 SP5 | All versions | 5.9-85.1 |
| `ncurses` | SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 5.9-85.1 |
| `ncurses` | SUSE:Linux Enterprise Software Development Kit 12 SP5 | All versions | 5.9-85.1 |
| `ncurses` | openSUSE:Leap 15.4 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | openSUSE:Leap 15.5 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | openSUSE:Leap Micro 5.3 | All versions | 6.1-150000.5.20.1 |
| `ncurses` | openSUSE:Leap Micro 5.4 | All versions | 6.1-150000.5.20.1 |

Products: Invisible-Island Ncurse.

## How do I fix CVE-2023-50495?

Upgrade to a fixed version.

## Is CVE-2023-50495 being exploited?

There is no known exploitation of CVE-2023-50495 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-50495 and fix it if it is affected.

What it is: CVE-2023-50495 is a medium-severity vulnerability in n/a, published on 12 Dec 2023. 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-2023-50495 in the wild and no public exploit code.

Affected product: n/a. 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-2023-50495/ (Markdown: https://insights.sbomify.com/CVE-2023-50495/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-50495
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-50495
- OSV: https://osv.dev/vulnerability/CVE-2023-50495

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-50495/
Summaries are generated and may contain mistakes; the official description above is the record.