Arbitrary file write via cached directory symlink
Published Jul 28, 2026 · Updated Jul 28, 2026
Path traversal in fpsqdb zip-lib before 1.1.0 allows remote attackers to write files outside the extraction root through crafted ZIP archives. The isOutsideTargetFolder check omits previously created directory symlinks, so later extractions write through the cached path without validating its destination. Exploitation requires a consuming application to extract attacker-controlled archives in sequence, and writes remain limited to locations writable by the application account.
Summary
What happened
Path traversal in fpsqdb zip-lib before 1.1.0 allows remote attackers to write files outside the extraction root through crafted ZIP archives. The isOutsideTargetFolder check omits previously created directory symlinks, so later extractions write through the cached path without validating its destination. Exploitation requires a consuming application to extract attacker-controlled archives in sequence, and writes remain limited to locations writable by the application account.
The record
- CVE
- CVE-2026-17524
- Published
- Jul 28, 2026
- Updated
- Jul 28, 2026
- Vendor
- fpsqdb
- Product
- zip-lib
- Classifications
- CWE-22, T1565.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 28, 2026CVE publishedPublication date reported by the CVE source.
- Jul 28, 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=0 <1.1.0
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
- Directory-symlink archive sequence proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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