What’s Vulnerable › Vulnerabilities

CVE-2026-77301: adm-zip: Uncontrolled memory allocation via the declared uncompressed size (DoS)

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-18 · updated 2026-09-24
• Weakness: CWE-789

Description

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.

Affected products

• cthackers adm-zip: before 0.6.1

References

• 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

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