MEDIUM 6.5 NVD
CVE-2026-13723
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 Un
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.
References
- 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
This medium severity vulnerability with a CVSS score of 6.5 was published on 2026-07-29 via NVD.
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