# CVE-2018-19217: Null dereference in n/a

> A NULL pointer dereference in the ncurses library allows attackers to cause a denial of service via the _nc_name_match function.

- **Severity:** Medium 6.5 (`CVSS:3.0/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 Nov 2018
- **Updated:** 5 Aug 2024
- **Also known as:** AZL-40988, DEBIAN-CVE-2018-19217, GHSA-gm6j-8p43-6m5w, UBUNTU-CVE-2018-19217

## What is CVE-2018-19217?

CVE-2018-19217 is a medium-severity vulnerability in n/a, published on 12 Nov 2018. 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

In ncurses, possibly a 6.x version, there is a NULL pointer dereference at the function _nc_name_match that will lead to a denial of service attack. NOTE: the original report stated version 6.1, but the issue did not reproduce for that version according to the maintainer or a reliable third-party

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2018-19217?

It affects 1 product.


Products: Invisible-Island Ncurses.

## How do I fix CVE-2018-19217?

Apply the vendor's patch.

## Is CVE-2018-19217 being exploited?

There is no known exploitation of CVE-2018-19217 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2017-10684](https://insights.sbomify.com/CVE-2017-10684/): Memory corruption in n/a (critical 9.8)
- [CVE-2017-10685](https://insights.sbomify.com/CVE-2017-10685/): Code injection in n/a (critical 9.8)
- [CVE-2023-29491](https://insights.sbomify.com/CVE-2023-29491/): Memory corruption in n/a (high 7.8)
- [CVE-2017-16879](https://insights.sbomify.com/CVE-2017-16879/): Memory corruption in n/a (high 7.8)
- [CVE-2017-13728](https://insights.sbomify.com/CVE-2017-13728/): Denial of service in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-19217 and fix it if it is affected.

What it is: CVE-2018-19217 is a medium-severity vulnerability in n/a, published on 12 Nov 2018. 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-2018-19217 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-2018-19217/ (Markdown: https://insights.sbomify.com/CVE-2018-19217/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-19217
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-19217
- OSV: https://osv.dev/vulnerability/CVE-2018-19217

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-19217/
Summaries are generated and may contain mistakes; the official description above is the record.