Debian: DSA-4556-1 Critical: Qtbase Out-of-Bounds Memory Issue

An out-of-bounds memory access was discovered in the Qt library, which
could result in denial of service through a text file containing many
directional characters.

The oldstable distribution (stretch) is not affected.

For the stable distribution (buster), this problem has been fixed in
version 5.11.3+dfsg1-1+deb10u1.

We recommend that you upgrade your qtbase-opensource-src packages.

For the detailed security status of qtbase-opensource-src please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/qtbase-opensource-src

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/