CVE-2020-26959

    Dashboard / Vulnerabilities / CVE-2020-26959

    CVE-2020-26959

    Published: 9 Dec 2020Last Modified: 16 Apr 2026

    Summary:

    Details: During browser shutdown, reference decrementing could have occured on a previously freed object, resulting in a use-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 83, Firefox ESR < 78.5, and Thunderbird < 78.5.

    References: https://www.mozilla.org/security/advisories/mfsa2020-51/, https://www.mozilla.org/security/advisories/mfsa2020-52/, https://www.mozilla.org/security/advisories/mfsa2020-50/, https://bugzilla.mozilla.org/show_bug.cgi?id=1669466

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    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
    CVE-2020-26959 | CVE-DB