UBUNTU-CVE-2026-120632

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    UBUNTU-CVE-2026-120632

    Published: 4 Nov 2026Last Modified: 5 Nov 2026
    Upstream:
    CVE-2026-120632

    Summary:

    Details: CGI versions before 5.00 for Perl allow CPU exhaustion via a backtracking regex on the XForms multipart/related Content-Type. When a POST Content-Type contains multipart/related, the boundary and start parameters are extracted with an unanchored pattern that puts .+ on either side of the boundary capture, which backtracks in cubic time on a header that does not match. No request body is needed.

    References: https://ubuntu.com/security/CVE-2026-120632, https://www.cve.org/CVERecord?id=CVE-2026-120632, https://lists.security.metacpan.org/cve-announce/msg/44874729/, https://github.com/leejo/CGI.pm/commit/1e529c7ac8d410a51b4b04ab9d6cc00d51ef33c0, https://github.com/leejo/CGI.pm/commit/1e529c7ac8d410a51b4b04ab9d6cc00d51ef33c0.patch, https://metacpan.org/release/LEEJO/CGI-4.72/source/lib/CGI.pm, https://metacpan.org/release/LEEJO/CGI-5.00/changes

    Affected packages

    Package

    Name: libcgi-pm-perl

    Purl: pkg:deb/ubuntu/libcgi-pm-perl?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    4.21-1

    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-2026-120632 | CVE-DB