SB2026070853 - Improper Validation of Syntactic Correctness of Input in Junos OS

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Main Vulnerability Database SB2026070853

SB2026070853 - Improper Validation of Syntactic Correctness of Input in Junos OS

Published: July 8, 2026

Security Bulletin ID SB2026070853
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Validation of Syntactic Correctness of Input (CVE-ID: CVE-2026-57026)

CWE-ID: CWE-1286 - Improper Validation of Syntactic Correctness of Input

CVSSv4: 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


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.


Remediation

Install update from vendor's website.

References