How severe is CVE-2025-64718?

CVE-2025-64718 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2025-64718 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-64718?

CVE-2025-64718 affects Nodeca Js-yaml. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-64718?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-64718 have an EU (EUVD) identifier?

Yes. CVE-2025-64718 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-175314.

When was CVE-2025-64718 published?

CVE-2025-64718 was published on 2025-11-13 and last updated on 2026-06-17.

CVE-2025-64718

CVE-2025-64718 is a medium-severity vulnerability in Nodeca Js-yaml with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1321.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-175314
Weakness: CWE-1321
Affected product: Nodeca Js-yaml
Published: 2025-11-13
Last modified: 2026-06-17

Description

js-yaml is a JavaScript YAML parser and dumper. In js-yaml before 4.1.1 and 3.14.2, 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. The problem is patched in js-yaml 4.1.1 and 3.14.2. Users 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).

Frequently asked questions

What is CVE-2025-64718?: js-yaml is a JavaScript YAML parser and dumper. In js-yaml before 4.1.1 and 3.14.2, 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. The problem is patched in js-yaml 4.1.1 and 3.14.2. Users 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).
How severe is CVE-2025-64718?: CVE-2025-64718 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2025-64718 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-64718?: CVE-2025-64718 affects Nodeca Js-yaml. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-64718?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-64718 have an EU (EUVD) identifier?: Yes. CVE-2025-64718 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-175314.
When was CVE-2025-64718 published?: CVE-2025-64718 was published on 2025-11-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nodeca:js-yaml:*:*:*:*:*:node.js:*:*

More vulnerabilities in Nodeca Js-yaml

CVE-2013-4660 — Medium (CVSS 6.8): The JS-YAML module before 2.0.5 for Node.js parses input without properly considering the unsafe !!js/function tag,…
CVE-2026-53550 — Medium (CVSS 5.3): js-yaml is a JavaScript YAML parser and dumper. Prior to 4.2.0 and 3.15.0, a crafted YAML document can trigger…

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