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OpenAdvisories
High RHSA-2021:2569 5 CVEs

Red Hat Security Advisory: libxml2 security update

Published Sep 13, 2024 · Updated Oct 15, 2026

Ecosystem: Red Hat

Fixed packages 9

ReleasePackageFixed in
Red Hat · RHEL 8 enterprise_linux:8::appstream libxml2-debuginfo 0:2.9.7-9.el8_4.2
Red Hat · RHEL 8 enterprise_linux:8::appstream libxml2-debugsource 0:2.9.7-9.el8_4.2
Red Hat · RHEL 8 enterprise_linux:8::appstream libxml2-devel 0:2.9.7-9.el8_4.2
Red Hat · RHEL 8 enterprise_linux:8::appstream python3-libxml2-debuginfo 0:2.9.7-9.el8_4.2
Red Hat · RHEL 8 enterprise_linux:8::baseos libxml2 0:2.9.7-9.el8_4.2
Red Hat · RHEL 8 enterprise_linux:8::baseos libxml2-debuginfo 0:2.9.7-9.el8_4.2
Red Hat · RHEL 8 enterprise_linux:8::baseos libxml2-debugsource 0:2.9.7-9.el8_4.2
Red Hat · RHEL 8 enterprise_linux:8::baseos python3-libxml2 0:2.9.7-9.el8_4.2
Red Hat · RHEL 8 enterprise_linux:8::baseos python3-libxml2-debuginfo 0:2.9.7-9.el8_4.2

Vulnerabilities 5

  • High 8.8
    CVE-2021-3518 EPSS 22%

    Nokogiri Implements libxml2 version vulnerable to use-after-free

    There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact from this flaw is to confidentiality, integrity, an…

    libxml2 libxml2 nokogiri libxml2 Debian Ubuntu Alpine RubyGems
  • High 8.6
    CVE-2021-3517 EPSS 17%

    Nokogiri contains libxml Out-of-bounds Write vulnerability

    There is a flaw in the xml entity encoding functionality of libxml2 in versions before 2.9.11. An attacker who is able to supply a crafted file to be processed by an application linked with the affected functionality of libxml2 could trigger an out-of-bounds …

    qt5-qtwebengine libxml2 libxml2 nokogiri Debian Ubuntu Alpine RubyGems
  • Medium 5.9
    CVE-2021-3537

    Nokogiri Implements libxml2 version vulnerable to null pointer dereferencing

    A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated, the flaw could be used …

    libxml2 libxml2 nokogiri libxml2 Debian Ubuntu Alpine RubyGems
  • Unscored —
    CVE-2021-3516

    There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted file to be p…

    libxml2 libxml2 Debian Ubuntu
  • Unscored —
    CVE-2021-3541

    A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing protection mechani…

    qt5-qtwebengine libxml2 libxml2 libxml2 Debian Ubuntu Alpine

References

  • article
    https://access.redhat.com/security/updates/classification/#moderate
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1950515
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1954225
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1954232
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1954242
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=1956522
  • advisory
    https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_2569.json
  • report
    https://access.redhat.com/security/cve/CVE-2021-3516
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2021-3516
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2021-3516
  • report
    https://access.redhat.com/security/cve/CVE-2021-3517
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2021-3517
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2021-3517
  • report
    https://access.redhat.com/security/cve/CVE-2021-3518
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2021-3518
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2021-3518
  • report
    https://access.redhat.com/security/cve/CVE-2021-3537
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2021-3537
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2021-3537
  • report
    https://access.redhat.com/security/cve/CVE-2021-3541
  • advisory
    https://www.cve.org/CVERecord?id=CVE-2021-3541
  • advisory
    https://nvd.nist.gov/vuln/detail/CVE-2021-3541