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Unscored USN-8023-1 0 CVEs

libxmltok vulnerabilities

Published Feb 11, 2026 · Updated Jun 25, 2026

Summary

It was discovered that Expat, contained within the xmltok library, incorrectly
handled the initialization of parsers for external entities. An attacker could
possibly use this issue to cause a denial of service. (CVE-2026-24515)

It was discovered that Expat, contained within the xmltok library, incorrectly
handled integer calculations when allocating memory for XML tags. An attacker
could possibly use this issue to cause a denial of service or execute arbitrary
code. (CVE-2026-25210)

Fixed packages 5

ReleasePackageFixed in
Ubuntu · Pro 16.04 LTS Pro:16.04:LTS libxmltok 1.2-3ubuntu0.16.04.1~esm5
Ubuntu · Pro 18.04 LTS Pro:18.04:LTS libxmltok 1.2-4ubuntu0.18.04.1~esm6
Ubuntu · Pro 20.04 LTS Pro:20.04:LTS libxmltok 1.2-4ubuntu0.20.04.1~esm6
Ubuntu · Pro 22.04 LTS Pro:22.04:LTS libxmltok 1.2-4ubuntu0.22.04.1~esm6
Ubuntu · Pro 24.04 LTS Pro:24.04:LTS libxmltok 1.2-4.1ubuntu2.24.0.4.1+esm4

References

  • report
    https://ubuntu.com/security/CVE-2026-24515
  • report
    https://ubuntu.com/security/CVE-2026-25210