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Ubuntu 25.10 pyasn1 Critical Denial of Service Issue USN-8129-1

ubuntu
Calendar Grey March 30, 2026
Dist Ubuntu Esm H88
Security Notice USN-8129-1 addresses a critical DoS issue in pyasn1 for Ubuntu releases. Update now to protect your system.
pyasn1 could be made to consume resources and crash if it received specially crafted input.

Summary

pyasn1 could be made to consume resources and crash if it received

specially crafted input.

Software Description:

- pyasn1: ASN.1 library for Python

Details:

It was discovered that pyasn1 incorrectly handled recursion when decoding

ASN.1 data. An attacker could use this issue to cause pyasn1 to consume

resources, leading to a denial of service.

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu pyasn1

Update Instructions

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

Ubuntu 25.10
  python3-pyasn1                  0.6.1-1ubuntu0.2

Ubuntu 24.04 LTS
  python3-pyasn1                  0.4.8-4ubuntu0.2

Ubuntu 22.04 LTS
  python3-pyasn1                  0.4.8-1ubuntu0.2

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

References

https://ubuntu.com/security/notices/USN-8129-1

CVE-2026-30922

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8129-1

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu pyasn1

Package Information

https://launchpad.net/ubuntu/+source/pyasn1/0.6.1-1ubuntu0.2
https://launchpad.net/ubuntu/+source/pyasn1/0.4.8-4ubuntu0.2
https://launchpad.net/ubuntu/+source/pyasn1/0.4.8-1ubuntu0.2

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