USN-6055-2

    Dashboard / Vulnerabilities / USN-6055-2

    USN-6055-2

    Published: 5 May 2023Last Modified: 25 Jun 2026

    Summary: ruby2.3, ruby2.5, ruby2.7 regression

    Details: USN-6055-1 fixed a vulnerability in Ruby. Unfortunately it introduced a regression. This update reverts the patches applied to CVE-2023-28755 in order to fix the regression pending further investigation. We apologize for the inconvenience. Original advisory details: It was discovered that Ruby incorrectly handled certain regular expressions. An attacker could possibly use this issue to cause a denial of service. (CVE-2023-28755)

    References: https://ubuntu.com/security/notices/USN-6055-2, https://ubuntu.com/security/CVE-2023-28755, https://launchpad.net/bugs/2018547

    Affected packages

    Package

    Name: ruby2.3

    Purl: pkg:deb/ubuntu/ruby2.3?arch=source&distro=esm-infra%2Fxenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2.3.1-2~ubuntu16.04.16+esm6

    Affected versions

    2.3.0-1
    2.3.0-2
    2.3.0-4ubuntu2
    2.3.0-4ubuntu3
    2.3.0-5ubuntu1
    2.3.1-2~16.04
    2.3.1-2~16.04.2
    2.3.1-2~16.04.4
    2.3.1-2~16.04.5
    2.3.1-2~16.04.6
    2.3.1-2~16.04.7
    2.3.1-2~16.04.9
    2.3.1-2~16.04.10
    2.3.1-2~16.04.11
    2.3.1-2~16.04.12
    2.3.1-2~ubuntu16.04.13
    2.3.1-2~ubuntu16.04.14
    2.3.1-2~ubuntu16.04.15
    2.3.1-2~ubuntu16.04.16
    2.3.1-2~ubuntu16.04.16+esm1
    2.3.1-2~ubuntu16.04.16+esm2
    2.3.1-2~ubuntu16.04.16+esm3
    2.3.1-2~ubuntu16.04.16+esm4
    2.3.1-2~ubuntu16.04.16+esm5

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    USN-6055-2 | CVE-DB