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CVE

CVE-2025-64718

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

CVE-2025-64718

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

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/PrototypePollutionPreventionCheatSheet.html

Package Versions Affected

Package Version
patch Availability
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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
-
C
H
U
-
C
H
U
-

Related Resources

No items found.

References

Severity

5.3

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
5.3
EPSS Probability
0.0002%
EPSS Percentile
0.04212%
Introduced Version
3.2.3
Fix Available
3.14.2

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