PT-2026-40678 · F5 · Big-Ip

Published 2026-05-13 · Updated 2026-05-17 · CVE-2026-42930

Positive Technologies (AI Summary)

CVSS v3.1

8.7

High

Base vector

AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions F5 BIG-IP versions prior to 17.1.3.2 F5 BIG-IP versions prior to 17.5.1.6 F5 BIG-IP versions prior to 21.0.0.2

Description When operating in Appliance mode, an authenticated attacker with the 'Administrator' role can bypass system restrictions through a path traversal issue. Path traversal is a technique that allows an attacker to access files and directories that are stored outside the web root folder by manipulating variables and parameters.

Recommendations Update F5 BIG-IP to version 17.1.3.2 or later. Update F5 BIG-IP to version 17.5.1.6 or later. Update F5 BIG-IP to version 21.0.0.2 or later.

Fix

Weakness Enumeration

CWE-35

Related Identifiers

CVE-2026-42930

Affected Products

Big-Ip

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2026-42930 · Security Note
• https://my.f5.com/manage/s/article/K000160876 · Patch, Vendor Advisory
• https://twitter.com/f1tym1/status/2056025523587838076 · Twitter Post