USN-8956-2: Brotli vulnerability

Published Oct 27, 2026
·
Updated

USN-8956-1 fixed a vulnerability in Brotli. This update provides the corresponding fixes for Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, and Ubuntu 20.04 LTS.

Original advisory details:

It was discovered that Brotli incorrectly handled certain compressed streams. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code.

Affected Software

26 affected componentsFixes available
Ubuntu Brotli
All of the following
ubuntu/brotli<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/libbrotli1<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/python3-brotli<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=20.04
All of the following
ubuntu/brotli<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/libbrotli1<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/python-brotli<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/python3-brotli<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=18.04
All of the following
ubuntu/brotli<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/libbrotli1<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/python-brotli<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
All of the following
ubuntu/python3-brotli<Ubuntu Pro
Ubuntu Pro
Ubuntu Ubuntu=16.04
ubuntu/brotli<1.0.3-1ubuntu1~16.04.2+esm1
1.0.3-1ubuntu1~16.04.2+esm1
ubuntu/brotli<1.0.3-1ubuntu1.3+esm1
1.0.3-1ubuntu1.3+esm1
ubuntu/brotli<1.0.7-6ubuntu0.1+esm1
1.0.7-6ubuntu0.1+esm1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/brotli to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  2. Upgrade

    Upgrade ubuntu/libbrotli1 to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  3. Upgrade

    Upgrade ubuntu/python3-brotli to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  4. Upgrade

    Upgrade ubuntu/python-brotli to a version that resolves this vulnerability.

    Fixed in Ubuntu Pro
  5. Upgrade

    Upgrade ubuntu/brotli to a version that resolves this vulnerability.

    Fixed in 1.0.3-1ubuntu1~16.04.2+esm1
  6. Upgrade

    Upgrade ubuntu/brotli to a version that resolves this vulnerability.

    Fixed in 1.0.3-1ubuntu1.3+esm1
  7. Upgrade

    Upgrade ubuntu/brotli to a version that resolves this vulnerability.

    Fixed in 1.0.7-6ubuntu0.1+esm1
  8. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch USN-8956-1
  9. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Patch USN-8956-2

Event History

Oct 27, 2026
Advisory Published
via Ubuntu·12:00 AM
Data Sourced
via Ubuntu·12:00 AM
DescriptionAffected Software
Advisory Published
via OSV·09:14 PM
Data Sourced
via OSV·09:14 PM
DescriptionAffected Software

Child vulnerabilities

Contains the following vulnerabilities.

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