This bug was fixed in the package libxml2 - 2.9.10+dfsg-5ubuntu0.20.04.5

libxml2 (2.9.10+dfsg-5ubuntu0.20.04.5) focal-security; urgency=medium

  * SECURITY UPDATE: NULL pointer dereference
    - debian/patches/CVE-2022-2309.patch: reset nsNr in
      xmlCtxReset in parser.c (LP: #1996494).
    - CVE-2022-2309
  * SECURITY UPDATE: Integer overflow
    - debian/patches/CVE-2022-40303.patch: fix integer overflows
      with XML_PARSE_HUGE in parser.c.
    - CVE-2022-40303
  * SECURITY UPDATE: Double-free
    - debian/patches/CVE-2022-40304.patch: fix dict
      corruption caused by entity ref cycles in
    - CVE-2022-40304

 -- Leonidas Da Silva Barbosa <>  Wed, 30 Nov
2022 09:53:52 -0300

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  CVE-2022-2309: NULL Pointer Dereference allows attackers to cause a
  denial of service (or application crash)

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