CVE-2026-13723Public exploitNetwork attack vector

Arbitrary file overwrite via Unicode-colliding symlink following

Published Jul 29, 2026 · Updated Jul 29, 2026

Path traversal in Develar app-builder 4.2.0 and earlier allows remote attackers to overwrite arbitrary files during ZIP extraction. The zipx.Unzip routine creates archive-supplied symlinks without checking target containment, then opens regular files without O_NOFOLLOW; APFS can resolve Unicode-colliding names to the planted link. A build must consume the crafted archive, and writes are limited to paths writable by the build user's account.

CVSS severity6.5
Medium
EPSS probability0.46%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Develar app-builder 4.2.0 and earlier allows remote attackers to overwrite arbitrary files during ZIP extraction. The zipx.Unzip routine creates archive-supplied symlinks without checking target containment, then opens regular files without O_NOFOLLOW; APFS can resolve Unicode-colliding names to the planted link. A build must consume the crafted archive, and writes are limited to paths writable by the build user's account.

The record

CVE
CVE-2026-13723
Published
Jul 29, 2026
Updated
Jul 29, 2026
Vendor
Develar
Product
app-builder
Classifications
CWE-22, CWE-59, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=4.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Develar · app-builderversion=0 <=4.2.0

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-59Improper Link Resolution Before File Access ('Link Following')
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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