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CVE-2026-56876 is a high-severity vulnerability in the extract-zip package caused by improper validation of symbolic link targets during ZIP archive extraction. When extract-zip processes a malicious archive containing a symlink entry whose target uses a relative path that traverses outside the intended destination, it creates the symlink without verifying that the resolved target remains within the extraction directory. This allows archive contents to escape the intended trust boundary through a symlink validation bypass. Depending on how the calling application subsequently handles the extracted content, the flaw can expose arbitrary file read or arbitrary file write conditions outside the extraction path.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a minimal proof-of-concept exploit consisting of a short README and a single JavaScript file, 'poc.js'. The PoC targets unsafe ZIP extraction behavior in Node.js workflows using the 'extract-zip' library. It programmatically creates a ZIP archive with 'yazl', embedding a symlink entry named 'innocent.txt' that points to '/etc/passwd' by setting the ZIP entry mode to a symlink-compatible value. After writing 'malicious_passwd.zip', the script extracts it into './extracted_poc', checks whether the extracted entry is a symbolic link, resolves the link target, determines whether it escapes the extraction directory, and if so reads and prints the first lines of '/etc/passwd'. There are no network capabilities, remote callbacks, or shell payloads; the exploit is a local file-handling PoC demonstrating arbitrary file read via symlink traversal during archive extraction. The repository structure is extremely small and purpose-built for vulnerability demonstration rather than operational exploitation.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
6 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An arbitrary file write and information disclosure vulnerability in extract-zip caused by a symlink validation bypass.
A path traversal vulnerability in extract-zip caused by improper validation of symlink targets during ZIP extraction, potentially allowing arbitrary file read or write outside the intended extraction directory.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.