# CVE-2018-19839: Memory corruption in n/a

> Attackers can cause a denial-of-service via heap-based buffer over-read in LibSass by providing a crafted sass file.

- **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:** 4 Dec 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-19839, GHSA-pfp7-r6qm-94j7, UBUNTU-CVE-2018-19839

## What is CVE-2018-19839?

CVE-2018-19839 is a medium-severity memory corruption vulnerability in n/a, published on 4 Dec 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 LibSass prior to 3.5.5, the function handle_error in sass_context.cpp allows attackers to cause a denial-of-service resulting from a heap-based buffer over-read via a crafted sass file.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2018-19839?

It affects 1 product.


Products: Sass-Lang Libsass.

## How do I fix CVE-2018-19839?

Upgrade to a fixed version.

## Is CVE-2018-19839 being exploited?

There is no known exploitation of CVE-2018-19839 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2018-11499](https://insights.sbomify.com/CVE-2018-11499/): Use after free in n/a (critical 9.8)
- [CVE-2022-26592](https://insights.sbomify.com/CVE-2022-26592/): Memory corruption in n/a (high 8.8)
- [CVE-2018-19827](https://insights.sbomify.com/CVE-2018-19827/): Use after free in n/a (high 8.8)
- [CVE-2018-11694](https://insights.sbomify.com/CVE-2018-11694/): Null dereference in n/a (high 8.8)
- [CVE-2018-11695](https://insights.sbomify.com/CVE-2018-11695/): Null dereference in n/a (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-19839 and fix it if it is affected.

What it is: CVE-2018-19839 is a medium-severity memory corruption vulnerability in n/a, published on 4 Dec 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-2018-19839 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-2018-19839/ (Markdown: https://insights.sbomify.com/CVE-2018-19839/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-19839
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-19839
- OSV: https://osv.dev/vulnerability/CVE-2018-19839

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-19839/
Summaries are generated and may contain mistakes; the official description above is the record.