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).
CVE-2025-64718
This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 66% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- Lower severity and no public exploit yet
A fix is available — apply it.
- CVSS v3
- 5.3
- EG Score
- 5.3(medium)
- EG Risk
- 39(Track)EG Risk 39/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity53% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 0%
- EPSS %ILE
- 34%
- KEV
- Not listed
Published
November 13, 2025
Last Modified
June 17, 2026
References (5)
- security-advisories@githubhttps://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879
- security-advisories@githubhttps://github.com/nodeca/js-yaml/commit/5278870a17454fe8621dbd8c445c412529525266
- security-advisories@githubhttps://github.com/nodeca/js-yaml/issues/730#issuecomment-3549635876
- security-advisories@githubhttps://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8m
- af854a3a-2127-422b-91ae-364da2661108https://github.com/advisories/GHSA-mh29-5h37-fv8m
Vendor Advisories for CVE-2025-64718(3)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:56431Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.18.27 security, enhancement & bug fix update
- RHSA-2026:26411Red Hat Product SecurityHigh
Red Hat Security Advisory: New container image: rhceph-9.0
- RHSA-2026:15979Red Hat Product SecurityHigh
Red Hat Security Advisory: Red Hat Ceph Storage
Patch Availability(1)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | rhceph/grafana-rhel9:1777566546 | 2026-05-11 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(5 across 5 ecosystems)
Debian:11(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| node-js-yaml | 3.14.1+dfsg+~3.12.6-2 ... 4.2.0+~4.0.9-1 (10 versions) | — | — |
Debian:12(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| node-js-yaml | 4.1.0+dfsg+~4.0.5-7, 4.1.1+dfsg+~4.0.9-1, 4.2.0+~4.0.9-1, 4.2.0+~4.0.9-2 | — | — |
Debian:13(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| node-js-yaml | 4.1.0+dfsg+~4.0.5-7, 4.1.1+dfsg+~4.0.9-1, 4.2.0+~4.0.9-1, 4.2.0+~4.0.9-2 | — | — |
Debian:14(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| node-js-yaml | 4.1.0+dfsg+~4.0.5-7 | 4.1.1+dfsg+~4.0.9-1 | — |
npm(1)
| Package | Vulnerable range | Fixed in | Dependents |
|---|---|---|---|
| js-yaml | — | 3.14.2 | — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 5× in last 7d / 28× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
Showing the most recent 100 of 139 total refreshes for this CVE.
- 2026-09-08 22:00 UTCEPSS rescore
- 2026-09-07 16:00 UTCEPSS rescore
- 2026-09-06 13:47 UTCEPSS rescore
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- 2026-08-24 23:44 UTCOSV refresh
- 2026-08-24 14:16 UTCEPSS rescore
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- 2026-08-12 13:50 UTCEPSS rescore
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- 2026-07-23 15:41 UTCOSV refresh
- 2026-07-23 14:18 UTCEPSS rescore
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- 2026-07-23 03:01 UTCEG score recompute
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- 2026-07-06 10:11 UTCOSV refresh
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Frequently asked(5)
What is CVE-2025-64718?
When was CVE-2025-64718 disclosed?
Is CVE-2025-64718 actively exploited?
What is the CVSS score of CVE-2025-64718?
How do I remediate CVE-2025-64718?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2025-64718
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