[GHSA-mh29-5h37-fv8m] js-yaml has prototype pollution in merge (<<) #6420
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Hi there @puzrin! A community member has suggested an improvement to your security advisory. If approved, this change will affect the global advisory listed at github.com/advisories. It will not affect the version listed in your project repository. This change will be reviewed by our Security Curation Team. If you have thoughts or feedback, please share them in a comment here! If this PR has already been closed, you can start a new community contribution for this advisory |
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mhassan1
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Nov 15, 2025
| ], | ||
| "summary": "js-yaml has prototype pollution in merge (<<)", | ||
| "details": "### Impact\n\nIn js-yaml 4.1.0 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.\n\n### Patches\n\nProblem is patched in js-yaml 4.1.1.\n\n### Workarounds\n\nYou 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).\n\n### References\n\nhttps://cheatsheetseries.owasp.org/cheatsheets/Prototype_Pollution_Prevention_Cheat_Sheet.html", | ||
| "details": "### Impact\n\nIn js-yaml 4.1.0 and below (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.\n\n### Patches\n\nProblem is patched in js-yaml 4.1.1 and 3.14.2.\n\n### Workarounds\n\nYou 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).\n\n### References\n\nhttps://cheatsheetseries.owasp.org/cheatsheets/Prototype_Pollution_Prevention_Cheat_Sheet.html", |
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| "details": "### Impact\n\nIn js-yaml 4.1.0 and below (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.\n\n### Patches\n\nProblem is patched in js-yaml 4.1.1 and 3.14.2.\n\n### Workarounds\n\nYou 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).\n\n### References\n\nhttps://cheatsheetseries.owasp.org/cheatsheets/Prototype_Pollution_Prevention_Cheat_Sheet.html", | |
| "details": "### Impact\n\nIn 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.\n\n### Patches\n\nProblem is patched in js-yaml 4.1.1 and 3.14.2.\n\n### Workarounds\n\nYou 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).\n\n### References\n\nhttps://cheatsheetseries.owasp.org/cheatsheets/Prototype_Pollution_Prevention_Cheat_Sheet.html", |
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I confirm |
louischan-oursky
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Nov 17, 2025
Due to github/advisory-database#6420 [email protected] is still not considered as non-vulnerable as of 2025-11-17
louischan-oursky
added a commit
to louischan-oursky/authgear-server
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Nov 17, 2025
Due to github/advisory-database#6420 [email protected] is still not considered as non-vulnerable as of 2025-11-17
tung2744
added a commit
to authgear/authgear-server
that referenced
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Nov 17, 2025
advisory-database
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merged commit b91b533
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mhassan1/advisory-improvement-6420
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Hi @mhassan1! Thank you so much for contributing to the GitHub Advisory Database. This database is free, open, and accessible to all, and it's people like you who make it great. Thanks for choosing to help others. We hope you send in more contributions in the future! |
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The vulnerability has also been patched in 3.14.2.