A new release of the Ubuntu Cloud Images for stable Ubuntu release 18.04 LTS (Bionic Beaver) is available at [1]. These new images superseded the existing images [2]. Images are available for download or immediate use on EC2 via publish AMI ids. Users who wish to update their existing installations can do so with:
   'sudo apt-get update && sudo apt-get dist-upgrade && sudo reboot'.

The following packages have been updated. Please see the full changelogs
for a complete listing of changes:
 * expat: 2.2.5-3ubuntu0.4 => 2.2.5-3ubuntu0.7 


The following is a complete changelog for this image.
new: {}
removed: {}
changed: ['libexpat1:amd64']
new snaps: {}
removed snaps: {}
changed snaps: []
==== expat: 2.2.5-3ubuntu0.4 => 2.2.5-3ubuntu0.7 ====
====     libexpat1:amd64
  * SECURITY UPDATE: Stack exhaustion
    - debian/patches/CVE-2022-25313.patch: prevent
      stack exhaustion in build_model in expat/lib/xmlparse.c.
    - debian/patches/fix-build_model-regression.patch: fix build_model
      regression in expat/lib/xmlparse.c.
    - CVE-2022-25313
  * SECURITY UPDATE: Integer overflow
    - debian/patches/CVE-2022-25314.patch: prevent integer overflow in
      copyString in expat/lib/xmlparse.c.
    - CVE-2022-25314
  * SECURITY UPDATE: Integer overflow
    - debian/patches/CVE-2022-25315.patch: prevent integer overflow in
      storeRawNames in expat/lib/xmlparse.c.
    - CVE-2022-25315
  * SECURITY UPDATE: relax fix to CVE-2022-25236 with regard to
    RFC 3986 URI characters and possibly regressions
    - debian/patches/CVE-2022-25236-3.patch: add a note on namespace URI
      validation in expat/doc/reference.html, expat/lib/expat.h.
    - debian/patches/CVE-2022-25236-4.patch: document namespace separator
      effect right in header expat/lib/expat.h.
    - debian/patches/CVE-2022-25236-5.patch: cover relaxed fix in tests.
    - debian/patches/CVE-2022-25236-6.patch: relax fix with regard to
      RFC 3986 URI characters in expat/lib/xmlparse.c. (LP: #1963903)

--
[1] http://cloud-images.ubuntu.com/releases/bionic/release-20220310/
[2] http://cloud-images.ubuntu.com/releases/bionic/release-20220308/