CVE-2026-13723

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.

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Produits concernés

• Develar app-builder

Scores CVSS

Faiblesses (CWE)

• CWE-22
• CWE-59

Références

• 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

Ailleurs

• NVD
• CVE.org
• CIRCL Vulnerability-Lookup
• CERT-FR
• GitHub Advisories