What’s Vulnerable › Vulnerabilities

CVE-2026-13723: Develar's electron-builder allows arbitrary file overwrite

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-29 · updated 2026-10-24
• Weakness: CWE-22

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.

Affected products

• Develar app-builder: through 4.2.0

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

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