# CVE-2018-1000663: Memory corruption in n/a

> A buffer overflow in the jsish JavaScript engine allows attackers to cause a denial of service via crafted JavaScript code execution.

- **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:** No
- **Published:** 6 Sep 2018
- **Updated:** 16 Sep 2024
- **Also known as:** GHSA-f6rr-c89r-f66w

## What is CVE-2018-1000663?

CVE-2018-1000663 is a medium-severity memory corruption vulnerability in Jsish Jsish, published on 6 Sep 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

jsish version 2.4.70 2.047 contains a Buffer Overflow vulnerability in function _jsi_evalcode from jsiEval.c that can result in Crash due to segmentation fault. This attack appear to be exploitable via The victim must execute crafted javascript code.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2018-1000663?

It affects 1 product.


Products: Jsish Jsish.

## How do I fix CVE-2018-1000663?

No fix has been published for CVE-2018-1000663 yet. Limit exposure of the affected software until one is available.

## Is CVE-2018-1000663 being exploited?

There is no known exploitation of CVE-2018-1000663 in the wild and no public exploit code.

## Other vulnerabilities in Jsish Jsish

- [CVE-2025-65570](https://insights.sbomify.com/CVE-2025-65570/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-24186](https://insights.sbomify.com/CVE-2024-24186/): Denial of service in n/a (critical 9.8)
- [CVE-2024-24188](https://insights.sbomify.com/CVE-2024-24188/): Memory corruption in n/a (critical 9.8)
- [CVE-2024-24189](https://insights.sbomify.com/CVE-2024-24189/): Use after free in n/a (critical 9.8)
- [CVE-2020-22873](https://insights.sbomify.com/CVE-2020-22873/): Memory corruption in n/a (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2018-1000663 and fix it if it is affected.

What it is: CVE-2018-1000663 is a medium-severity memory corruption vulnerability in Jsish Jsish, published on 6 Sep 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-2018-1000663 in the wild and no public exploit code.

Affected product: Jsish Jsish. 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-2018-1000663/ (Markdown: https://insights.sbomify.com/CVE-2018-1000663/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-1000663
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-1000663
- OSV: https://osv.dev/vulnerability/CVE-2018-1000663

---
From sbomify Insights: https://insights.sbomify.com/CVE-2018-1000663/
Summaries are generated and may contain mistakes; the official description above is the record.