Bug ID 1021201: JSON parser is not fully UTF-8 compliant

Last Modified: Feb 10, 2023

Bug Tracker

Affected Product:  See more info
BIG-IP ASM(all modules)

Known Affected Versions:
15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,

Opened: May 25, 2021
Severity: 3-Major


JSON parser's character set does not include support for UTF-8 characters and that can result in 'Malformed JSON data' violation when processing requests containing those characters in JSON data.


Requests are blocked.


Requests contain unsupported UTF-8 characters, such as emoji characters, in JSON payload.


The System Variable 'relax_unicode_in_json' can be utilized to ignore what JSON identifies as malformed characters when it encounters such unsupported characters. (1) Enable 'relax_unicode_in_json' through CLI: # /usr/share/ts/bin/add_del_internal add relax_unicode_in_json 1 (2) Restart ASM to ensure changes take effect: # bigstart restart asm

Fix Information


Behavior Change