SB2026070860 - Return of pointer value outside of expected range in Junos OS Evolved and Junos OS

Security Bulletin ID SB2026070860

CSH Severity

Low

Patch available

YES

Number of vulnerabilities 1

Exploitation vector Local access

Highest impact Denial of service

Breakdown by Severity

Low
Medium
High
Critical

Description

This security bulletin contains information about 1 vulnerability.

1) Return of pointer value outside of expected range (CVE-ID: CVE-2026-57025)

CWE-ID: CWE-466 - Return of pointer value outside of expected range

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to return of pointer value outside of expected range error in the fileio library. A local user can cause a Denial-of-Service (DoS).

On EX Series, QFX Series and MX Series a low-privileged attacker issuing a specific 'show l2-learning' command will cause an l2ald crash which will lead to a temporary service impact for all layer 2 services until the process has automatically restarted.

Remediation

Install update from vendor's website.

References

https://supportportal.juniper.net/s/article/2026-07-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-EX-Series-QFX-Series-MX-Series-A-specific-show-l2-learning-command-causes-l2ald-crash-CVE-2026-57025