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GHSA-mh29-5h37-fv8m

js-yaml has prototype pollution in merge (<<)

Source: GitHub Advisory Database (reviewed) Moderate CVE-2025-64718

Packages

EcosystemPackageAffectedFixed in
npm js-yaml >= 4.0.0, < 4.1.1 4.1.1
npm js-yaml < 3.14.2 3.14.2

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact In js-yaml 4.1.0, 4.0.0, and 3.14.1 and below, it's possible for an attacker to modify the prototype of the result of a parsed yaml document via prototype pollution (`__proto__`). All users who parse untrusted yaml documents may be impacted. ### Patches Problem is patched in js-yaml 4.1.1 and 3.14.2. ### Workarounds You can protect against this kind of attack on the server by using `node --disable-proto=delete` or `deno` (in Deno, pollution protection is on by default). ### References https://cheatsheetseries.owasp.org/cheatsheets/Prototype_Pollution_Prevention_Cheat_Sheet.html

References

External links from the advisory. They lead to third-party sites.