UBUNTU-CVE-2026-26962

    Dashboard / Vulnerabilities / UBUNTU-CVE-2026-26962

    UBUNTU-CVE-2026-26962

    Published: 2 Apr 2026Last Modified: 4 Nov 2026
    Upstream:
    CVE-2026-26962

    Summary:

    Details: Rack is a modular Ruby web server interface. From version 3.2.0 to before version 3.2.6, Rack::Multipart::Parser unfolds folded multipart part headers incorrectly. When a multipart header contains an obs-fold sequence, Rack preserves the embedded CRLF in parsed parameter values such as filename or name instead of removing the folded line break during unfolding. As a result, applications that later reuse those parsed values in HTTP response headers may be vulnerable to downstream header injection or response splitting. This issue has been patched in version 3.2.6.

    References: https://ubuntu.com/security/CVE-2026-26962, https://www.cve.org/CVERecord?id=CVE-2026-26962, https://ubuntu.com/security/notices/USN-8182-1, https://ubuntu.com/security/notices/USN-8989-1

    Affected packages

    Package

    Name: ruby-rack

    Purl: pkg:deb/ubuntu/ruby-rack?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.5.2-1
    1.5.2-1ubuntu0.1~esm1
    1.5.2-3+deb8u3ubuntu1~esm2
    1.5.2-3+deb8u3ubuntu1~esm3
    1.5.2-3+deb8u3ubuntu1~esm4
    1.5.2-3+deb8u3ubuntu1~esm6
    1.5.2-3+deb8u3ubuntu1~esm7
    1.5.2-3+deb8u3ubuntu1~esm8
    1.5.2-3+deb8u3ubuntu1~esm9
    1.5.2-3+deb8u3ubuntu1~esm10
    1.5.2-3+deb8u3ubuntu1~esm11

    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
    UBUNTU-CVE-2026-26962 | CVE-DB