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Ubuntu 24.04 LTS Expat Critical Denial of Service USN-8022-2 CVE-2026-24515

ubuntu
Calendar Grey February 16, 2026
Dist Ubuntu Esm H88
Security notice for Ubuntu detailing issues found in Expat libraries and necessary updates to secure the system.
Several security issues were fixed in Expat.

Summary

Several security issues were fixed in Expat.

Software Description:

- expat: XML parsing C library

Details:

USN-8022-1 fixed vulnerabilities in Expat. This update provides the

corresponding updates for Ubuntu 24.04 LTS.

Original advisory details:

It was discovered that Expat 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 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)

Topics%20covered

Topics Covered

security advisory denial of service update Ubuntu important expat

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.04 LTS
  expat                           2.6.1-2ubuntu0.4
  libexpat1                       2.6.1-2ubuntu0.4

In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-8022-2

https://ubuntu.com/security/notices/USN-8022-1

CVE-2026-24515, CVE-2026-25210

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8022-2

Topics%20covered

Topics Covered

security advisory denial of service update Ubuntu important expat

Package Information

https://launchpad.net/ubuntu/+source/expat/2.6.1-2ubuntu0.4

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