GHSA-mh29-5h37-fv8m
js-yaml has prototype pollution in merge (<<)
At a glance
- Published
- Updated
- CVE
- CVE-2025-64718
- CVSS_V3
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Description
### 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
Affected packages
| Package | Versions |
|---|---|
| npm · js-yaml | introduced 4.0.0, fixed 4.1.1 |
| npm · js-yaml | introduced 0, fixed 3.14.2 |
References
- https://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8m WEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-64718 ADVISORY
- https://github.com/nodeca/js-yaml/issues/730#issuecomment-3549635876 WEB
- https://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879 WEB
- https://github.com/nodeca/js-yaml/commit/5278870a17454fe8621dbd8c445c412529525266 WEB
- https://github.com/advisories/GHSA-mh29-5h37-fv8m ADVISORY
- https://github.com/nodeca/js-yaml PACKAGE
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |