Security Advisory WSO2-2021-1238

Published: September 02, 2021

Version: 1.0.0

Severity: Medium

CVSS Score: 4.9 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H)


  • WSO2 API Manager : 2.2.0, 2.5.0 , 2.6.0 , 3.0.0 , 3.1.0 , 3.2.0
  • WSO2 IS as Key Manager : 5.6.0 , 5.7.0 , 5.9.0 , 5.10.0


Zip Bomb vulnerability in API Publisher.


A Zip Bomb attack could be performed by uploading a maliciously crafted zip file using the API Publisher.


By leveraging the Zip bomb vulnerability in the API Publisher, an attacker could cause an availability impact to the application or the server where the application is running.


If the latest version of the affected WSO2 product is not mentioned under the affected product list, you may migrate to the latest version to receive security fixes.

Otherwise, you may apply the relevant fixes to the product based on the public fix(s):


If you are a WSO2 customer with a support subscription, use WSO2 Updates in order to apply the fix.