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Canonical Ubuntu Server 22.04 LTS (Jammy Jellyfish) Update Version 2.1.12-stable-1ubuntu0.1

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Update Summary

USN-8710-1 fixes multiple libevent security issues on Ubuntu 22.04 LTS Jammy Jellyfish. The update addresses use-after-free, HTTP request smuggling, out-of-bounds read, resource exhaustion, and security restriction bypass issues.

Update Details

Security

  • Fixes a use-after-free in certain empty output buffers that could lead to denial of service or arbitrary code execution (CVE-2026-63381).
  • Fixes HTTP request boundary desynchronization that could allow HTTP request smuggling (CVE-2026-63382).
  • Fixes an out-of-bounds read in malformed tagged RPC data that could cause denial of service (CVE-2026-63383).
  • Fixes excessive resource consumption from large tagged RPC payload lengths that could cause denial of service (CVE-2026-63384).
  • Fixes inconsistent handling of HTTP URIs and header values that could bypass security restrictions (CVE-2026-63385).

Hints

  • A standard system update installs the required fixes.
  • For Ubuntu 22.04 LTS jammy, update libevent-2.1-7, libevent-core-2.1-7, libevent-dev, and libevent-extra-2.1-7 to 2.1.12-stable-1ubuntu0.1.

Product Information

Vendor: Canonical

Product: Ubuntu Server

Product type: Software

Application category: Utilities

Platform: Linux

Variant: 22.04 LTS (Jammy Jellyfish)

Version: 2.1.12-stable-1ubuntu0.1

Vendor release date: Sep 1, 2026

Original release notes: View on vendor site

Published on updatealert.io: Sep 2, 2026

Description: Server operating system for Linux infrastructure and workloads.

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