CVE-2026-57054

Summary

A Use of Incorrectly-Resolved Name or Reference vulnerability in the URL filtering plugin of Juniper Networks Junos OS on MX Series allows an unauthenticated, network-based attacker to bypass web filtering and access downstream resources that should be unreachable.

If an MX Series device is configured with web filtering, and an attacker sends a request with a specifically formatted URL, this request will get forwarded despite the system being configured to block it. In turn, an attacker can access downstream resources that are expected to be unreachable.

This issue affects Junos OS on MX Series:

  • all versions before 23.2R2-S7,
  • 23.4 versions before 23.4R2-S8,
  • 24.2 versions before 24.2R2-S5,
  • 24.4 versions before 24.4R2-S4,
  • 25.2 versions before 25.2R2-S1,
  • 25.4 versions before 25.4R1-S2, 25.4R2.

Affected Software

VendorProductVersion RangeStatus
Juniper NetworksJunos OS0 < 23.2R2-S7affected
Juniper NetworksJunos OS23.4 < 23.4R2-S8affected
Juniper NetworksJunos OS24.2 < 24.2R2-S5affected
Juniper NetworksJunos OS24.4 < 24.4R2-S4affected
Juniper NetworksJunos OS25.2 < 25.2R2-S1affected
Juniper NetworksJunos OS25.4 < 25.4R1-S2, 25.4R2affected

Weaknesses

  • CWE-706: CWE-706 Use of Incorrectly-Resolved Name or Reference

Workarounds

There are no known workarounds for this issue.

References