# CVE-2018-11489: Memory corruption in n/a

> Heap-based buffer overflow in GIFLIB allows attackers to cause denial of service or potentially execute arbitrary code via crafted GIF files.

- **Severity:** High 8.8 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/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:** 26 May 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-11489, GHSA-w8g7-8frf-5h65

## What is CVE-2018-11489?

CVE-2018-11489 is a high-severity memory corruption vulnerability in n/a, published on 26 May 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

The DGifDecompressLine function in dgif_lib.c in GIFLIB (possibly version 3.0.x), as later shipped in cgif.c in sam2p 0.49.4, has a heap-based buffer overflow because a certain CrntCode array index is not checked. This will lead to a denial of service or possibly unspecified other impact.

Weakness: CWE-787 (Out-of-bounds Write), CWE-129 (Improper Validation of Array Index)

## Which versions are affected by CVE-2018-11489?

It affects 2 products.


Products: Giflib Project Giflib, Sam2p Project Sam2p.

## How do I fix CVE-2018-11489?

Apply the vendor's patch.

## Is CVE-2018-11489 being exploited?

There is no known exploitation of CVE-2018-11489 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2016-3177](https://insights.sbomify.com/CVE-2016-3177/): Use after free in n/a (critical 9.8)
- [CVE-2021-40633](https://insights.sbomify.com/CVE-2021-40633/): Denial of service in n/a (high 8.8)
- [CVE-2026-26740](https://insights.sbomify.com/CVE-2026-26740/): Memory corruption in n/a (high 8.2)
- [CVE-2023-48161](https://insights.sbomify.com/CVE-2023-48161/): Memory corruption in n/a (high 7.1)
- [CVE-2024-45993](https://insights.sbomify.com/CVE-2024-45993/): Memory corruption in n/a (medium 6.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-11489 and fix it if it is affected.

What it is: CVE-2018-11489 is a high-severity memory corruption vulnerability in n/a, published on 26 May 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-2018-11489 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-2018-11489/ (Markdown: https://insights.sbomify.com/CVE-2018-11489/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-11489
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-11489
- OSV: https://osv.dev/vulnerability/CVE-2018-11489

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-11489/
Summaries are generated and may contain mistakes; the official description above is the record.