CVE-2026-2265: Replicator Replicator Deserializes Untrusted User Input Vulnerability

MODERATE
Advisory Identifier: GHSA-2gmp-34j9-fqjm
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CVSS 6.5
CWE-502
Published
Advisory Summary

CVE-2026-2265 is a MODERATE (CVSS 6.5) replicator deserializes untrusted user input vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Replicator libraries in the npm ecosystem. The issue involves replicator deserializes untrusted user input. Remediation is available in the latest vendor maintenance releases.

CVE-2026-2265 at a Glance

CVE Identifier CVE-2026-2265
GHSA Identifier GHSA-2gmp-34j9-fqjm
Severity MODERATE
CVSS v3.1 Base Score 6.5
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Replicator
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 6.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality Low (C:L)
Integrity Low (I:L)
Availability None (A:N)

How to Fix CVE-2026-2265

To remediate this vulnerability, upgrade all affected Replicator dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

replicator fixed: Latest secure release 
npm install replicator@Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

npm ls replicator

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2026-2265, inspect your project dependencies using npm:

npm ls replicator

Analyze the terminal output to locate any version of Replicator in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: The npm ls replicator command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Replicator, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

An unauthenticated Remote Code Execution (RCE) vulnerability exists in applications that use the Replicator node package manager (npm) version 1.0.5 to deserialize untrusted user input and execute the resulting object.

CVE-2026-2265 Affected Replicator Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
replicator
npm/replicator
npm
≤ 1.0.5

References

NVD — CVE-2026-2265 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-2265
Replicator Source Repository REPOSITORY
https://github.com/inikulin/replicator/pull/19
Replicator Source Repository REPOSITORY
https://github.com/inikulin/replicator
morielharush.github.io/2026/03/31/cve-2026... WEB
https://morielharush.github.io/2026/03/31/cve-2026-2265-replicator-deserialization-of-untrusted-data

Frequently Asked Questions

What is CVE-2026-2265?
CVE-2026-2265 is a security vulnerability in Replicator involving Replicator deserializes untrusted user input under CWE-502: Deserialization of Untrusted Data.
Which Replicator versions are affected?
Affected versions include releases prior to current release patches across affected packages: replicator.
What version fixes CVE-2026-2265?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is replicator affected?
Yes, replicator is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-2265?
CVE-2026-2265 has a CVSS v3.1 base score of 6.5 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-2265?
CVE-2026-2265 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check npm dependencies for CVE-2026-2265?
Run the dependency tree command: 'npm ls replicator'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-2gmp-34j9-fqjm",
  "modified" : "2026-04-03T23:15:20Z",
  "published" : "2026-04-01T18:36:38Z",
  "aliases" : [ "CVE-2026-2265" ],
  "summary" : "Replicator deserializes untrusted user input",
  "details" : "An unauthenticated Remote Code Execution (RCE) vulnerability exists in applications that use the Replicator node package manager (npm) version 1.0.5 to deserialize untrusted user input and execute the resulting object.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "replicator"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.0.5"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-2265"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/inikulin/replicator/pull/19"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/inikulin/replicator"
  }, {
    "type" : "WEB",
    "url" : "https://morielharush.github.io/2026/03/31/cve-2026-2265-replicator-deserialization-of-untrusted-data"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-04-03T23:15:20Z",
    "nvd_published_at" : "2026-04-01T17:28:38Z"
  }
}