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TI-2025-35519 Aliases CVE-2025-57349GHSA-xfqm-j7pc-xrfc

The messageformat package, an implementation of the Unicode MessageFormat 2 specification…

Priority LOW 39CWE-1321Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub.

Summary

The messageformat package, an implementation of the Unicode MessageFormat 2 specification for JavaScript, is vulnerable to prototype pollution due to improper handling of message key paths in versions prior to 2.3.0. The flaw arises when processing nested message keys containing special characters (e.g., __proto__ ), which can lead to unintended modification of the JavaScript Object prototype. This vulnerability may allow a remote attacker to inject properties into the global object prototype via specially crafted message input, potentially causing denial of service or other undefined behaviors in applications using the affected component.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00402 34th percentileScored 2026-11-07
Fix Fixed messageformat (npm): 3.0.0-beta.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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
——all versions—No fix listedCNA
—messageformat (npm)before 3.0.0-beta.03.0.0-beta.0Patch availableGHSA-xfqm-j7pc-xrfc
  • — Vendor— Affected all versions Fixed in — No fix listed CNA
  • messageformat (npm) Vendor— Affected before 3.0.0-beta.0 Fixed in 3.0.0-beta.0 Patch available GHSA-xfqm-j7pc-xrfc

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:openjsf:messageformat:*:*:*:*:*:*:*:*before 2.3.0Vulnerablefast-uri
  • cpe:2.3:a:openjsf:messageformat:*:*:*:*:*:*:*:* Versions before 2.3.0 Vulnerable ·fast-uri

Remediation

  • Fix · GHSA-xfqm-j7pc-xrfc messageformat (npm) Fixed in 3.0.0-beta.0 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-57349
  2. 2026-10-03 Alias added: GHSA-xfqm-j7pc-xrfc

References

Advisory 2

Other 1

Sources

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