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Ubuntu 22.04 LTS USN-8219-1 ujson Important Denial Service Issues

ubuntu
Calendar Grey April 28, 2026
Dist Ubuntu Esm H88
Multiple security issues in UltraJSON on various Ubuntu versions require immediate attention for safe operation.
Several security issues were fixed in UltraJSON.

Summary

Several security issues were fixed in UltraJSON.

Software Description:

- ujson: Ultra fast JSON encoder and decoder

Details:

Cameron Criswell discovered that UltraJSON contained a memory leak

that would occur when parsing large integers. An attacker could

possibly use this issue to cause UltraJSON to crash, resulting in a

denial of service. This issue only affected Ubuntu 24.04 LTS,

Ubuntu 25.10, and Ubuntu 26.04 LTS. (CVE-2026-32874)

It was discovered that UltraJSON contained integer overflow/underflow

issues when calculating how much memory to reserve for indentation in

certain instances. An attacker could possibly use this issue to cause

UltraJSON to crash, resulting in a denial of service. (CVE-2026-32875)

Topics%20covered

Topics Covered

security advisory denial of service update Ubuntu important ujson

Update Instructions

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

Ubuntu 26.04 LTS
  python3-ujson                   5.11.0-3ubuntu0.1

Ubuntu 25.10
  python3-ujson                   5.10.0-1ubuntu0.1

Ubuntu 24.04 LTS
  python3-ujson                   5.9.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 22.04 LTS
  python3-ujson                   5.1.0-1ubuntu0.1~esm2
                                  Available with Ubuntu Pro

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

References

https://ubuntu.com/security/notices/USN-8219-1

CVE-2026-32874, CVE-2026-32875

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8219-1

Topics%20covered

Topics Covered

security advisory denial of service update Ubuntu important ujson

Package Information

https://launchpad.net/ubuntu/+source/ujson/5.11.0-3ubuntu0.1
https://launchpad.net/ubuntu/+source/ujson/5.10.0-1ubuntu0.1

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