UBUNTU-CVE-2019-12519

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    UBUNTU-CVE-2019-12519

    Published: 15 Apr 2020Last Modified: 4 Feb 2026
    Upstream:
    CVE-2019-12519
    Aliases:
    USN-4356-1

    Summary:

    Details: An issue was discovered in Squid through 4.7. When handling the tag esi:when when ESI is enabled, Squid calls ESIExpression::Evaluate. This function uses a fixed stack buffer to hold the expression while it's being evaluated. When processing the expression, it could either evaluate the top of the stack, or add a new member to the stack. When adding a new member, there is no check to ensure that the stack won't overflow.

    References: https://ubuntu.com/security/CVE-2019-12519, https://gitlab.com/jeriko.one/security/-/blob/master/squid/CVEs/CVE-2019-12519.txt, http://www.squid-cache.org/Advisories/SQUID-2019_12.txt, https://ubuntu.com/security/notices/USN-4356-1, https://www.cve.org/CVERecord?id=CVE-2019-12519

    Affected packages

    Package

    Name: squid3

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=xenial

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -3.5.12-1ubuntu7.11

    Affected versions

    3.3.8-1ubuntu16
    3.3.8-1ubuntu17

    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-2019-12519 | CVE-DB