PT-2026-65851 · Develar · App Builder

CVE-2026-13723 · Published 2026-07-29 · Updated 2026-07-29

Mitre

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

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.

Fix

Path traversal

Link Following

Weakness Enumeration

CWE-22

CWE-59

Related Identifiers

CVE-2026-13723

Affected Products

App Builder

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-13723 · Security Note
• https://github.com/develar/app-builder/pull/163 · Note
• https://github.com/develar/app-builder · Note
• http://kb.cert.org/vuls/id/293714 · Note
• https://kb.cert.org/vuls/id/293714 · Note