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

High · CVSS 7.5CVE-2026-77301GHSA-7Q85-XJ36-VMFC

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

Answer in brief

CVE-2026-77301 records a High severity (CVSS 7.5) vulnerability in adm-zip: Uncontrolled memory allocation via the declared uncompressed size (DoS). The current sources do not mark it as known exploited. The current feed maps cthackers/adm-zip (generic), adm-zip (npm), adm-zip (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 18, 2026Updated Sep 18, 2026Source checked Sep 18, 2026First seen by HOL Sep 18, 2026Material review Sep 18, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 7.5
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps cthackers/adm-zip (generic), adm-zip (npm), adm-zip (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
cthackers/adm-zipgeneric	< 0.6.1	Not reported
adm-zipnpm	<0.6.1	0.6.1
adm-zipnpm	>=0 <0.6.1	0.6.1

Recommended response

Check inventory. Check lockfiles and deployed manifests for cthackers/adm-zip, adm-zip, adm-zip.
Review the reported fix. Update adm-zip to 0.6.1; adm-zip to 0.6.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 18, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.