Memory Allocation with Excessive Size Value Affecting adm-zip package, versions <0.6.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-JS-ADMZIP-19963965
- published20 Sept 2026
- disclosed18 Sept 2026
- creditJosé Antonio Zamudio Amaya
Introduced: 18 Sep 2026
NewCVE-2026-77301 (opens in a new tab)How to fix?
Upgrade adm-zip to version 0.6.1 or higher.
Overview
adm-zip is a JavaScript implementation for zip data compression for NodeJS.
Affected versions of this package are vulnerable to Memory Allocation with Excessive Size Value via the async decompression path in methods/inflater.js, where the decompression size cap enforced by zlib's maxOutputLength option is not applied to the streaming API. An attacker can supply a zip archive whose entries declare a small or zero uncompressed size but contain a large compressed payload (a decompression bomb), causing unbounded memory growth and a crash of the host process. Additionally, a declared size of 0 previously disabled the cap entirely on the synchronous path, allowing the same class of attack through entries that lie about their size.