Ubuntu alert USN-8219-1 (ujson)

From:
             
 
noreply+usn-bot@canonical.com
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8219-1] UltraJSON vulnerabilities
Date:
             
 
Tue, 28 Apr 2026 18:45:47 +0000
Message-ID:
             
 
<E1wHnRL-00009s-UH@lists.ubuntu.com>
==========================================================================
Ubuntu Security Notice USN-8219-1
April 28, 2026

ujson vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

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)

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

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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