CVE-2026-17524

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-28 · updated 2026-07-30
Weakness: CWE-22

Description

Versions of the package zip-lib before 1.1.0 are vulnerable to Directory Traversal via the caching mechanism for path validation during the extraction process. An attacker can bypass security checks designed to prevent directory traversal. The intended security function, isOutsideTargetFolder, only checks and caches the path status when the initial directory symlink is created during the first extraction.

Affected products

zip-lib: before 1.1.0 — fixed in 1.1.0

How to fix

Upgrade to a fixed version: zip-lib 1.1.0. Check the vendor advisory for mitigations.

References

https://github.com/fpsqdb/zip-lib/commit/0c29b1e17050f2611f4f37e6aaa92a60b3cb89d5
https://github.com/fpsqdb/zip-lib/issues/14
https://security.snyk.io/vuln/SNYK-JS-ZIPLIB-13834403

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