7.4 High

zip is a zip library for Rust that supports reading and writing simple ZIP files.

CVE-2026-115908

Summary Verified version: zip 9.0.0-pre3 Affected versions: 7.2.0 and later Precondition: The attacker knows (or can guess) the absolute path of the extraction destination The validation applied to symlinks is purely lexical. As a result, an attacker can write arbitrary files outside the extraction directory through a symlink. Exploitation requires the attacker to know (or guess) the absolute path of the destination, but this is realistic in practice: CI workspaces, /opt/app, a fixed Downloads path, and so on. Impact extends further on Windows (verified on real hardware for both the separate-drive and UNC-share cases): Because simplifiedcomponents discards the Prefix component, paths like D:\ or a UNC path \\attacker\share\ pass the startswith check. As a result, outpath.push gets replaced onto a different drive/remote share, so a single symlink is enough — no intermediate symlink chain is required. That said, creating a symlink on Windows requires SeCreateSymbolicLinkPrivilege (administrator rights or Developer Mode enabled). Real-hardware verification (Windows 10 VM (19045.2604), tests/pocwin.rs): With the extraction target set to a temporary directory under C:, both of the…

Assessment

CVSS: 7.4 (v3.1)
Severity: High
EPSS: 0.00432% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 26 October 2026
Last updated: 29 October 2026
Affected: rust · zip
Weakness: CWE-22, CWE-59, CWE-61
Assigner: security-advisories@github.com

CVSS vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H

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