Red Hat Security Advisory: libxml2 security update

Fixed packages 9

Vulnerabilities 3

• Critical 9.1
  CVE-2025-49794

  Libxml: heap use after free (uaf) leads to denial of service (dos)

  A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the <sch:name path="..."/> schema elements. This flaw allows a malicious actor to craft a malicious XML …

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 6 Linux Debian Ubuntu Azure Linux Alpine
  Jun 16, 2025
• Critical 9.1
  CVE-2025-49796

  Libxml: type confusion leads to denial of service (dos)

  A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that can lead libxml to crash, resulting in a denial of …

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 6 Linux Debian Ubuntu Azure Linux Alpine
  Jun 16, 2025
• High 7.5
  CVE-2025-6021

  Libxml2: integer overflow in xmlbuildqname() leads to stack buffer overflow in libxml2

  A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.

  Red Hat Red Hat Enterprise Linux 9 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 6 Linux Debian Ubuntu Azure Linux Alpine
  Jun 12, 2025

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2372373
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2372385
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2372406
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2025/rhsa-2025_11580.json
• report
  https://access.redhat.com/security/cve/CVE-2025-6021
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-6021
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-6021
• article
  https://gitlab.gnome.org/GNOME/libxml2/-/issues/926
• report
  https://access.redhat.com/security/cve/CVE-2025-49794
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-49794
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-49794
• article
  https://gitlab.gnome.org/GNOME/libxml2/-/issues/931
• report
  https://access.redhat.com/security/cve/CVE-2025-49796
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-49796
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-49796
• article
  https://gitlab.gnome.org/GNOME/libxml2/-/issues/933