# CVE-2026-110715: MuJS 1.3.6 before 1.3.9 Heap Out-of-Bounds Read/Write via Array.prototype.sort

> Attackers can corrupt memory and potentially execute code or crash the process by exploiting a heap out-of-bounds read/write in MuJS Array.prototype.sort.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 14 Oct 2026
- **Updated:** 15 Oct 2026
- **Also known as:** DEBIAN-CVE-2026-110715, GHSA-45w2-9pc7-5crm, UBUNTU-CVE-2026-110715

## What is CVE-2026-110715?

CVE-2026-110715 is a medium-severity memory corruption vulnerability in Artifex Software MuJS, published on 14 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

MuJS 1.3.6 before 1.3.9 contains a heap out-of-bounds read and write vulnerability in Array.prototype.sort that allows attackers to corrupt memory by inflating a simple array's length. Attackers can supply JavaScript that enlarges a dense array's length and calls sort, causing Ap_sort_cmp and Ap_sort_swap to access slots past the buffer and crash the process.

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2026-110715?


## How do I fix CVE-2026-110715?

No fix has been published for CVE-2026-110715 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-110715 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110715 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-110715 and fix it if it is affected.

What it is: CVE-2026-110715 is a medium-severity memory corruption vulnerability in Artifex Software MuJS, published on 14 Oct 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-110715 exists.

Affected product: Artifex Software MuJS. 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-2026-110715/ (Markdown: https://insights.sbomify.com/CVE-2026-110715/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-110715
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-110715
- OSV: https://osv.dev/vulnerability/CVE-2026-110715

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-110715/
Summaries are generated and may contain mistakes; the official description above is the record.