Improper Validation of Syntactic Correctness of Input in Junos OS - CVE-2026-57026

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Main Vulnerability Database Vulnerabilities #VU137139

Improper Validation of Syntactic Correctness of Input in Junos OS - CVE-2026-57026

Published: July 8, 2026


Vulnerability identifier: #VU137139
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-57026
CWE-ID: CWE-1286
Exploitation vector: Remote access
Exploit availability: No public exploit available
Vendor: Juniper Networks, Inc.
Affected software:
Junos OS

Detailed vulnerability description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper validation of syntactic correctness of input error in the SIP plugin. A remote non-authenticated attacker can cause a Denial-of-Service (DoS).

If the SIP ALG is enabled on an affected device, the processing of a malformed SIP invite packet will cause a flow processing daemon (flowd) crash and restart.

This leads to a complete service outage until the system has automatically recovered.


How to mitigate CVE-2026-57026

Install updates from vendor's website.

Sources