Effective July 31st, two major Root CAs used by Chunghwa Telecom will no longer be trusted on Chrome 139 and higher. Chunghwa Telecom is the largest telecommunication company responsible for Taiwan's network infrastructure, and their root CA is used to sign certificates used by major Taiwanese government websites.
Google cited "compliance failures, unmet improvement commitments and the absence of tangible, measurable progress in response to publicly disclosed incident reports."
The Taiwan Ministry of Digital Affairs (MoDA) has issued a press release today stating that MoDA was made aware of CHT's improper conduct in March, and have since begun migrating to another Root CA provider (possibly Taiwan CA, another major Root CA that had worked with TW govs).
Meanwhile, CHT has also published a statement and attempting to downplay the situation by claiming "only" Chrome is affected and none of the other browsers like Apple's and Microsoft's (curiously, Firefox was not explicitly mentioned), and that they are "attempting to work with Chrome to get Root CA trust back in March 2026."
Source:
https://newtalk.tw/news/view/2025-06-03/974334
https://www.cht.com.tw/home/enterprise/news/latest-news/2025/0602-1810
Still