CVE-2026-77301

adm-zip is a JavaScript library for creating and extracting ZIP archives in Node.js. Prior to 0.6.1, getData() in zipEntry.js trusts an entry's central-directory uncompressed size and allocates output memory before validating that value against the actual compressed data and decompression result. A small crafted ZIP can declare a multi-gigabyte uncompressed size, causing Buffer.alloc and decompression handling to commit excessive resident memory before CRC validation reports an error. Applications that read entries from untrusted archives can therefore be terminated by the operating system or suffer service-wide memory exhaustion. This issue is fixed in version 0.6.1.

• https://github.com/cthackers/adm-zip/commit/491600683dacb6cb9fe0718a0eeb9cb5eb49afa6
• https://github.com/cthackers/adm-zip/releases/tag/v0.6.1
• https://github.com/cthackers/adm-zip/security/advisories/GHSA-7q85-xj36-vmfc
• https://github.com/cthackers/adm-zip/security/advisories/GHSA-7q85-xj36-vmfc