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    CVE-2018-18500

    A use-after-free vulnerability can occur while parsing an HTML5 stream in concert with custom HTML elements. This results in the stream parser object being freed while still in use, leading to a potentially exploitable crash. This vulnerability affects Thunderbird < 60.5, Firefox ESR < 60.5, and Firefox < 65.

    Published:Jan 29, 2019
    Last Modified:Nov 21, 2024
    EPS:Feb 5, 2019
    EPSS Score:0.28802
    CVSS Score:9.8

    Affected Products

    Vendor
    Canonical
    Product
    Ubuntu Linux
    Vendor
    Debian
    Product
    Debian Linux
    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Firefox Esr
    Vendor
    Mozilla
    Product
    Thunderbird
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Enterprise Linux Desktop
    Vendor
    Redhat
    Product
    Enterprise Linux Server
    Vendor
    Redhat
    Product
    Enterprise Linux Server Aus
    Vendor
    Redhat
    Product
    Enterprise Linux Server Eus
    Vendor
    Redhat
    Product
    Enterprise Linux Server Tus
    Vendor
    Redhat
    Product
    Enterprise Linux Workstation

    Exploits

    https://github.com/sophoslabs/CVE-2018-18500

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-13476 (CVSS 7.3) — IBM Informix Dynamic Server 14.10, 15.0, and 12.10 could allow an unauthenticated user to execute arbitrary co…
    CVE-2026-13367 (CVSS 7.8) — IBM Informix Dynamic Server 14.10, and 15.0 contain a local privilege escalation vulnerability in the oninit s…
    CVE-2026-47337 (CVSS 3.3) — Ubuntu Linux 6.8, 6.17 and 7.0 contain SAUCE patches with a possible NULL pointer dereference in the handling …
    CVE-2026-47336 (CVSS 3.3) — Ubuntu Linux 6.8 contains SAUCE patches with a possible use of an uninitialized variable in AppArmor AF_INET/A…
    CVE-2026-47335 (CVSS 5.5) — Ubuntu Linux 6.8 contains SAUCE patches with a possible NULL pointer dereference in the handling of AppArmor n…
    CVE-2026-47334 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly sleep while holding a spinlock…
    CVE-2026-47333 (CVSS 7.8) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which can potentially incorrectly compute the si…
    CVE-2026-47332 (CVSS 5.5) — Ubuntu Linux 6.8, 6.17 and 7.0 contain AppArmor SAUCE patches which incorrectly validate the size of an intern…
    CVE-2026-47331 (CVSS 7.8) — Ubuntu Linux 6.8 contains AppArmor SAUCE patches which fail to acquire a lock when modifying a linked list. An…
    CVE-2026-47330 (CVSS 3.3) — Ubuntu Linux 6.8, 7.17 and 7.0 contain AppArmor SAUCE patches which can, under certain circumstances, use an u…

    References

    http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00021.html
    http://www.securityfocus.com/bid/106781
    https://access.redhat.com/errata/RHSA-2019:0218
    https://access.redhat.com/errata/RHSA-2019:0219
    https://access.redhat.com/errata/RHSA-2019:0269
    https://access.redhat.com/errata/RHSA-2019:0270
    https://lists.debian.org/debian-lts-announce/2019/01/msg00025.html
    https://lists.debian.org/debian-lts-announce/2019/02/msg00024.html
    https://security.gentoo.org/glsa/201903-04
    https://security.gentoo.org/glsa/201904-07
    https://usn.ubuntu.com/3874-1/
    https://usn.ubuntu.com/3897-1/
    https://www.debian.org/security/2019/dsa-4376
    https://www.debian.org/security/2019/dsa-4392
    https://www.mozilla.org/security/advisories/mfsa2019-01/
    https://www.mozilla.org/security/advisories/mfsa2019-02/
    https://www.mozilla.org/security/advisories/mfsa2019-03/
    http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00021.html
    http://www.securityfocus.com/bid/106781
    https://access.redhat.com/errata/RHSA-2019:0218
    https://access.redhat.com/errata/RHSA-2019:0219
    https://access.redhat.com/errata/RHSA-2019:0269
    https://access.redhat.com/errata/RHSA-2019:0270
    https://lists.debian.org/debian-lts-announce/2019/01/msg00025.html
    https://lists.debian.org/debian-lts-announce/2019/02/msg00024.html
    https://security.gentoo.org/glsa/201903-04
    https://security.gentoo.org/glsa/201904-07
    https://usn.ubuntu.com/3874-1/
    https://usn.ubuntu.com/3897-1/
    https://www.debian.org/security/2019/dsa-4376
    https://www.debian.org/security/2019/dsa-4392
    https://www.mozilla.org/security/advisories/mfsa2019-01/
    https://www.mozilla.org/security/advisories/mfsa2019-02/
    https://www.mozilla.org/security/advisories/mfsa2019-03/

    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