CVE-2026-13723
Develar's electron-builder allows arbitrary file overwrite
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.
INFO
Published Date :
July 29, 2026, 6:16 p.m.
Last Modified :
Oct. 24, 2026, 1:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | MEDIUM | 134c704f-9b21-4f2e-91b3-4a467353bcc0 |
Solution
- Implement robust Unicode normalization for all file paths.
- Validate file paths rigorously after normalization.
- Update app-builder to the latest secure version.
- Avoid processing ZIP archives from untrusted sources.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-13723.
| URL | Resource |
|---|---|
| http://kb.cert.org/vuls/id/293714 | |
| https://github.com/develar/app-builder | |
| https://github.com/develar/app-builder/pull/163 | |
| https://www.kb.cert.org/vuls/id/293714 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-13723 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-13723
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-13723 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-13723 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 24, 2026
Action Type Old Value New Value Added Translation Title: app-builder de Develar, Description: Una vulnerabilidad en la rutina de extracción “zipx.Unzip” del creador de aplicaciones de Develar permite a un atacante sobrescribir archivos arbitrarios en macOS APFS explotando una Colisión de Normalización Unicode combinada con el comportamiento de seguimiento de enlaces simbólicos. APFS trata ciertos nombres de archivo equivalentes en Unicode como idénticos (p. ej., ß ? ss), mientras que el creador de aplicaciones no realiza ninguna normalización canónica antes de validar o escribir rutas. Como resultado, un archivo ZIP manipulado que contenga: • una entrada de enlace simbólico llamada ss que apunta a un archivo objetivo, y • un archivo regular llamado ß que contiene datos controlados por el atacante, hará que la segunda escritura siga el enlace simbólico y sobrescriba el archivo objetivo. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 29, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L Added CWE CWE-22 Added CWE CWE-59 Added SSVC {'id': 'CVE-2026-13723', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-07-29T18:21:31.256338Z'} -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Jul. 29, 2026
Action Type Old Value New Value Added Reference https://www.kb.cert.org/vuls/id/293714 -
New CVE Received by [email protected]
Jul. 29, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Develar', 'product': 'app-builder', 'versions': [{'status': 'affected', 'version': '0', 'versionType': 'custom', 'lessThanOrEqual': '4.2.0'}]}] Added 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. Added Reference http://kb.cert.org/vuls/id/293714 Added Reference https://github.com/develar/app-builder Added Reference https://github.com/develar/app-builder/pull/163