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Update

USN-7975-1: pyasn1 vulnerability

Ubuntu ServerUbuntu Server
Canonical

USN-7975-1: pyasn1 vulnerability

Publication date: 22 January 2026
Overview: pyasn1 could be made to crash if it received specially crafted input.

Packages
pyasn1 - ASN.1 library for Python

Details
It was discovered that pyasn1 incorrectly handled malformed RELATIVE-OIDs
with excessive continuation octets. An attacker could possibly use this
issue to cause pyasn1 to consume memory, leading to a denial of service.

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

  • 25.10 questing python3-pyasn1 – 0.6.1-1ubuntu0.1
  • 24.04 LTS noble python3-pyasn1 – 0.4.8-4ubuntu0.1
  • 22.04 LTS jammy python3-pyasn1 – 0.4.8-1ubuntu0.1
More updatesTo the product
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