CVE WatchJul 29, 2026

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 APF

CVSS

6.5

Medium

EPSS

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KEV

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Exploit Today

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0-100

Published: Jul 29, 2026 · Last modified: Jul 29, 2026 · CWE-22 · CWE-59

EPSS · 30d

Not enough EPSS history yet.

Technical 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.

Official references

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