Debian Security Advisory

DLA-2369-1 libxml2 -- LTS security update

Date Reported:
10 Sep 2020
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 895245, Bug 862450, Bug 949583, Bug 969529, Bug 949582.
In Mitre's CVE dictionary: CVE-2017-8872, CVE-2017-18258, CVE-2018-14404, CVE-2018-14567, CVE-2019-19956, CVE-2019-20388, CVE-2020-7595, CVE-2020-24977.
More information:

Several security vulnerabilities were corrected in libxml2, the GNOME XML library.

  • CVE-2017-8872

    Global buffer-overflow in the htmlParseTryOrFinish function.

  • CVE-2017-18258

    The xz_head function in libxml2 allows remote attackers to cause a denial of service (memory consumption) via a crafted LZMA file, because the decoder functionality does not restrict memory usage to what is required for a legitimate file.

  • CVE-2018-14404

    A NULL pointer dereference vulnerability exists in the xpath.c:xmlXPathCompOpEval() function of libxml2 when parsing an invalid XPath expression in the XPATH_OP_AND or XPATH_OP_OR case. Applications processing untrusted XSL format inputs may be vulnerable to a denial of service attack.

  • CVE-2018-14567

    If the option --with-lzma is used, allows remote attackers to cause a denial of service (infinite loop) via a crafted XML file.

  • CVE-2019-19956

    The xmlParseBalancedChunkMemoryRecover function has a memory leak related to newDoc->oldNs.

  • CVE-2019-20388

    A memory leak was found in the xmlSchemaValidateStream function of libxml2. Applications that use this library may be vulnerable to memory not being freed leading to a denial of service.

  • CVE-2020-7595

    Infinite loop in xmlStringLenDecodeEntities can cause a denial of service.

  • CVE-2020-24977

    Out-of-bounds read restricted to xmllint --htmlout.

For Debian 9 stretch, these problems have been fixed in version 2.9.4+dfsg1-2.2+deb9u3.

We recommend that you upgrade your libxml2 packages.

For the detailed security status of libxml2 please refer to its security tracker page at:

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: