# CVE-2026-13723: Develar's electron-builder allows arbitrary file overwrite

> Attackers can overwrite arbitrary files on macOS by exploiting Unicode normalization collisions and symlink following in the ZIP extraction routine.

- **Severity:** Medium 6.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 29 Jul 2026
- **Updated:** 29 Jul 2026
- **Also known as:** GHSA-m52r-27c6-4q88

## What is CVE-2026-13723?

CVE-2026-13723 is a medium-severity path traversal vulnerability in Develar app-builder, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the `zipx.Unzip` extraction routine of Develar's app-builder allows an attacker to overwrite arbitrary files on macOS APFS by exploiting a Unicode Normalization Collision combined with symlink following behavior. APFS treats certain Unicode equivalent filenames as identical (e.g., ß ↔ ss), while app builder performs no canonical normalization before validating or writing paths. As a result, a crafted ZIP archive containing:
•	a symlink entry named ss pointing to a target file, and
•	a regular file named ß containing attacker controlled data,
will cause the second write to follow the symlink and overwrite the target file.

Weakness: CWE-59 (Improper Link Resolution Before File Access), CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-13723?


## How do I fix CVE-2026-13723?

No fix has been published for CVE-2026-13723 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-13723 being exploited?

There is no known exploitation of CVE-2026-13723 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-13723 and fix it if it is affected.

What it is: CVE-2026-13723 is a medium-severity path traversal vulnerability in Develar app-builder, published on 29 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-13723 in the wild and no public exploit code.

Affected product: Develar app-builder. 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-2026-13723/ (Markdown: https://insights.sbomify.com/CVE-2026-13723/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-13723
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-13723
- OSV: https://osv.dev/vulnerability/CVE-2026-13723

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-13723/
Summaries are generated and may contain mistakes; the official description above is the record.