Skip to main content

Prototype Pollution CVE-2025-64718

MEDIUM
Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321)
2025-11-13 security-advisories@github.com
Information Disclosure Prototype Pollution Js Yaml Nodeca
5.3
CVSS 3.1 · Vendor: github
View

Vulnerability Assessment

Weakness
CWE
CWE-1321
OWASP Top 10:2025
A03:2021 - Injection
ASVS 5.0
V3 - Web Frontend Security Prototype pollution prevention
MITRE ATT&CK

2 techniques across 2 tactics: Execution, Initial Access

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

Sign in to read
Impact

CVSS score of 5.3 (MEDIUM). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. EPSS exploitation probability: 0.02%.
Exploit ScenarioDerived

A remote attacker could modify object prototypes to inject properties affecting application logic by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

Get an e-mail when this CVE is exploited, patched or re-scored. Free account.

Alert me

AnalysisAIv1 – Mar 28, 2026

js-yaml is a JavaScript YAML parser and dumper. Rated medium severity (CVSS 5.3), this vulnerability is remotely exploitable, no authentication required, low attack complexity. This Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) vulnerability could allow attackers to modify object prototypes to inject properties affecting application logic.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Freeze prototypes, validate object keys, avoid recursive merging of untrusted data.

Affected Packages

npm js-yaml fix: 3.14.2, 4.1.1

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in npm

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Sign in to check
Technical ContextAI · show details

This vulnerability is classified as Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution) (CWE-1321), which allows attackers to modify object prototypes to inject properties affecting application logic. 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). Affected products include: Nodeca Js-Yaml. Version information: before 4.1.1.

Know when Prototype Pollution gets its next vulnerability

  • Watch products and get an email when something new is published
  • Check this CVE against your own stack and servers
  • Exploit and PoC references, threat intelligence from 22 sources
Continue with Google Continue with GitHub

No credit card · 7-day full trial

Severity by source

Vendor (github) PRIMARY 5.3 MEDIUM
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
SUSE MEDIUM
Red Hat 5.3 MEDIUM

Primary rating from Vendor (github).

CVSS VectorVendor: github

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

2
Patch released
Mar 28, 2026 - 19:22 nvd
Patch available
CVE Published
Nov 13, 2025 - 16:15 nvd
MEDIUM 5.3

DescriptionCVE.org

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).

Blast Radius

ecosystem impact
† from your stack dependencies † transitive graph · vuln.today resolves 4-path depth
  • 5,994 npm packages depend on js-yaml (138 direct, 5,869 indirect)

Ecosystem-wide dependent count for version 4.0.0.

Executive ViewAI

Why It Matters

Organizations using js-yaml should be aware of moderate risk from CVE-2025-64718, a prototype pollution vulnerability rated CVSS 5.3. Exploitation could compromise the security of affected deployments. A patch is available and should be applied during regular vulnerability management.

Business Impact: Low
Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score
0.0%
Top 94% exploitable
Data Quality
5 sources
Confidence: Medium
NVD CVE.org EPSS Vendor GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact
Low

Priority Score

26
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +26
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Affected Products (CPE)CVE.org

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

More in Prototype Pollution

View all
CVE-2026-34621 HIGH POC
8.6 Apr 11

Prototype pollution in Adobe Acrobat Reader versions 24.001.30356, 26.001.21367 and earlier enables arbitrary code execu
CVE-2021-23450 CRITICAL POC
9.8 Dec 17

All versions of package dojo are vulnerable to Prototype Pollution via the setObject function. Rated critical severity (
CVE-2024-56059 CRITICAL
9.8 Dec 18

Prototype pollution in the farinspace Partners WordPress plugin (versions up to and including 0.2.0) enables remote unau
CVE-2021-23383 CRITICAL POC
9.8 May 04

The package handlebars before 4.7.7 are vulnerable to Prototype Pollution when selecting certain compiling options to co
CVE-2020-7788 CRITICAL POC
9.8 Dec 11

This affects the package ini before 1.3.6. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitabl
CVE-2020-28271 CRITICAL POC
9.8 Nov 12

Prototype pollution vulnerability in 'deephas' versions 1.0.0 through 1.0.5 allows attacker to cause a denial of service
CVE-2023-38894 CRITICAL POC
9.8 Aug 16

A Prototype Pollution issue in Cronvel Tree-kit v.0.7.4 and before allows a remote attacker to execute arbitrary code vi
CVE-2024-24292 CRITICAL POC
9.8 Mar 28

A Prototype Pollution issue in Aliconnect /sdk v.0.0.6 allows an attacker to execute arbitrary code via the aim function
CVE-2023-26121 CRITICAL POC
10.0 Apr 11

All versions of the package safe-eval are vulnerable to Prototype Pollution via the safeEval function, due to improper s
CVE-2021-23449 CRITICAL POC
10.0 Oct 18

This affects the package vm2 before 3.9.4 via a Prototype Pollution attack vector, which can lead to execution of arbitr
CVE-2024-39011 CRITICAL POC
9.8 Jul 30

Prototype Pollution in chargeover redoc v2.0.9-rc.69 allows attackers to execute arbitrary code or cause a Denial of Ser
CVE-2024-38988 CRITICAL POC
9.8 Mar 28

alizeait unflatto <= 1.0.2 was discovered to contain a prototype pollution via the method exports.unflatto at /dist/inde

Same technique Information Disclosure

View all
CVE-2019-2725 CRITICAL POC
9.8
CVE-2021-34523 CRITICAL POC
9.0
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2025-68613 HIGH POC
8.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Image SLES-Azure-3P Image SLES-Azure-Basic Image SLES-Azure-Standard Image SLES-BYOS-Azure Image SLES-BYOS-EC2 Image SLES-BYOS-GCE Image SLES-EC2 Image SLES-GCE Image SLES-Hardened-BYOS-Azure Image SLES-Hardened-BYOS-EC2 Image SLES-Hardened-BYOS-GCE Image SLES-SAP-Azure Image SLES-SAP-Azure-3P Image SLES-SAP-BYOS-Azure Image SLES-SAP-BYOS-EC2 Image SLES-SAP-BYOS-GCE Image SLES-SAP-GCE Image SLES-SAPCAL-Azure Image SLES-SAPCAL-EC2 Image SLES-SAPCAL-GCE Affected
SUSE Linux Enterprise Server 16.0 SUSE Linux Enterprise Server for SAP applications 16.0 Fixed
SUSE Linux Micro 6.2 Fixed
openSUSE Leap 16.0 Fixed
openSUSE Tumbleweed Fixed

References

Advisories & patches
PATCH https://github.com/nodeca/js-yaml/commit/383665ff4248ec2192d1274e934462bb30426879 PATCH https://github.com/nodeca/js-yaml/commit/5278870a17454fe8621dbd8c445c412529525266 ADVISORY https://github.com/advisories/GHSA-mh29-5h37-fv8m ADVISORY https://github.com/nodeca/js-yaml/security/advisories/GHSA-mh29-5h37-fv8m ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20170/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20182/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20540/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20580/ REF https://github.com/nodeca/js-yaml/issues/730#issuecomment-3549635876

Search Externally

GitHub PoC Exploit-DB PacketStorm Snyk Rapid7 Nuclei Templates Trickest PoC
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy