Uninitialized data in PDFium in Google Chrome prior to 90.0.4430.72 allowed a remote attacker to obtain potentially sensitive information from process memory via a crafted PDF file.
https://www.debian.org/security/2021/dsa-4906
https://security.gentoo.org/glsa/202104-08
https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop_14.html