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TI-2025-04223 Aliases CVE-2025-4727GHSA-j3v9-6gc7-vf5f

Meteor livedata_server.js Object.assign redos

Priority MEDIUM 61CWE-1333Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-1333.

Summary

A vulnerability was found in Meteor up to 3.2.1 and classified as problematic. This issue affects the function Object.assign of the file packages/ddp-server/livedata_server.js. The manipulation of the argument forwardedFor leads to inefficient regular expression complexity. The attack may be initiated remotely. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used. Upgrading to version 3.2.2 is able to address this issue. The identifier of the patch is f7ea6817b90952baaea9baace2a3b4366fee6a63. It is recommended to upgrade the affected component.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00922 60th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
—Meteor3.2.0; 3.2.1—No fix listedCNA
—meteor (npm)up to 3.2.1—No fix listedGHSA-j3v9-6gc7-vf5f
  • Meteor Vendor— Affected 3.2.0; 3.2.1 Fixed in — No fix listed CNA
  • meteor (npm) Vendor— Affected up to 3.2.1 Fixed in — No fix listed GHSA-j3v9-6gc7-vf5f

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:meteor:meteor:*:*:*:*:*:*:*:*before 3.2.2VulnerableMeteor
  • cpe:2.3:a:meteor:meteor:*:*:*:*:*:*:*:* Versions before 3.2.2 Vulnerable ·Meteor

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-4727
  2. 2026-10-03 Alias added: GHSA-j3v9-6gc7-vf5f

References

Patch 3

Advisory 1

Other 2

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences