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Ubuntu SimpleEval Significant Arbitrary Code Execution Flaw USN-8301-1

ubuntu
Calendar Grey May 25, 2026
Dist Ubuntu Esm H88
SimpleEval vulnerability allows arbitrary code execution via crafted input. Update is crucial for affected Ubuntu versions.
SimpleEval could be made to run programs if it received specially crafted input.

Summary

SimpleEval could be made to run programs if it received specially crafted

input.

Software Description:

- simpleeval: Python library for evaluating expressions

Details:

Byambadalai Sumiya discovered that SimpleEval did not properly restrict

attribute access and callback handling inside a sandbox. An attacker could

possibly use this issue to execute arbitrary code.

Topics%20covered

Topics Covered

security advisory Ubuntu important execution INPUT

Update Instructions

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

Ubuntu 26.04 LTS
  python3-simpleeval              1.0.3-1+deb13u1build0.26.04.1

Ubuntu 25.10
  python3-simpleeval              1.0.3-1+deb13u1build0.25.10.1

Ubuntu 24.04 LTS
  python3-simpleeval              0.9.12-1+deb12u1build0.24.04.1

Ubuntu 22.04 LTS
  python3-simpleeval              0.9.11-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  python3-simpleeval              0.9.10-1+deb11u1build0.20.04.1
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  python-simpleeval               0.9.5-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  python3-simpleeval              0.9.5-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  python-simpleeval               0.8.7-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  python3-simpleeval              0.8.7-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

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

References

https://ubuntu.com/security/notices/USN-8301-1

CVE-2026-32640

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8301-1

Topics%20covered

Topics Covered

security advisory Ubuntu important execution INPUT

Package Information

https://launchpad.net/ubuntu/+source/simpleeval/1.0.3-1+deb13u1build0.26.04.1
https://launchpad.net/ubuntu/+source/simpleeval/1.0.3-1+deb13u1build0.25.10.1
https://launchpad.net/ubuntu/+source/simpleeval/0.9.12-1+deb12u1build0.24.04.1

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