Arbitrary file write via backslash traversal
Published Jul 23, 2026 · Updated Jul 23, 2026
Path traversal in Ne-Lexa PhpZip 4.0.0 through 4.0.2 allows remote attackers to write files outside the extraction directory. ZipFile::extractTo passes entryName through normalizeZipPath, which splits only on forward slashes, so Windows backslash-separated dot-dot components remain when the path is joined to the destination. Exploitation requires a consuming Windows application to extract an attacker-supplied archive; writes are limited by that application's filesystem permissions.
Summary
What happened
Path traversal in Ne-Lexa PhpZip 4.0.0 through 4.0.2 allows remote attackers to write files outside the extraction directory. ZipFile::extractTo passes entryName through normalizeZipPath, which splits only on forward slashes, so Windows backslash-separated dot-dot components remain when the path is joined to the destination. Exploitation requires a consuming Windows application to extract an attacker-supplied archive; writes are limited by that application's filesystem permissions.
The record
- CVE
- CVE-2026-16767
- Published
- Jul 23, 2026
- Updated
- Jul 23, 2026
- Vendor
- Ne-Lexa
- Product
- PhpZip
- Classifications
- CWE-22
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 23, 2026CVE publishedPublication date reported by the CVE source.
- Jul 23, 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.
- Affected versionversion=4.0.0
- Affected versionversion=4.0.1
- Affected versionversion=4.0.2
What conditions does exploitation require?
What is affected?
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.
Weakness, pattern, technique
Public exploit references
- Windows backslash traversal proof of conceptproof of concept · demonstrated
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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