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Ubuntu 16.04 Expat Important Denial of Service CVE-2026-41080 USN-8520-1

ubuntu
Calendar Grey July 9, 2026
Dist Ubuntu Esm H88
Update Ubuntu 16.04 LTS to fix Expat denial of service issue due to improper input handling. Critical security patch needed.
Expat could be made to crash if it received specially crafted input.

Summary

Expat could be made to crash if it received specially crafted input.

Software Description:

- expat: XML parsing C library

Details:

It was discovered that Expat used insufficient entropy when generating

hash salt values for its internal hash table. An attacker could use this

to craft an XML document that triggers hash flooding, leading to a

denial of service.

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important expat hash flooding

Update Instructions

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

Ubuntu 16.04 LTS
  libexpat1                       2.1.0-7ubuntu0.16.04.5+esm12
                                  Available with Ubuntu Pro

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

References

https://ubuntu.com/security/notices/USN-8520-1

CVE-2026-41080

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8520-1

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important expat hash flooding

Package Information

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