CVE-2018-18500

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

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.

Metrics

CVSS 3.0 9.8/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

VendorProductVersions
n/an/an/a

References

Timeline

Published
Feb 5, 2019
Last modified
Jun 17, 2026
NVD status
Modified

Related CVEs from 2018

CVE-2018-185019.8Mozilla developers and community members reported memory safety bugs present in Firefox 64 and Firefox ESR 60.4. Some of these bugs showed eCVE-2018-185029.8Mozilla developers and community members reported memory safety bugs present in Firefox 64. Some of these bugs showed evidence of memory corCVE-2018-185038.8When JavaScript is used to create and manipulate an audio buffer, a potentially exploitable crash may occur because of a compartment mismatcCVE-2018-185049.8A crash and out-of-bounds read can occur when the buffer of a texture client is freed while it is still in use during graphic operations. ThCVE-2018-1850510.0An earlier fix for an Inter-process Communication (IPC) vulnerability, CVE-2011-3079, added authentication to communication between IPC endpCVE-2018-185065.9When proxy auto-detection is enabled, if a web server serves a Proxy Auto-Configuration (PAC) file or if a PAC file is loaded locally, this CVE-2018-185086.5In Network Security Services (NSS) before 3.36.7 and before 3.41.1, a malformed signature can cause a crash due to a null dereference, resulCVE-2018-185095.3A flaw during verification of certain S/MIME signatures causes emails to be shown in Thunderbird as having a valid digital signature, even iCVE-2018-18519.8IBM WebSphere Application Server Liberty OpenID Connect could allow a remote attacker to execute arbitrary code on the system, caused by impCVE-2018-185106.5The about:crashcontent and about:crashparent pages can be triggered by web content. These pages are used to crash the loaded page or the broCVE-2018-185114.3Cross-origin images can be read from a canvas element in violation of the same-origin policy using the transferFromImageBitmap method. *NoteCVE-2018-185129.8A use-after-free vulnerability can occur while playing a sound notification in Thunderbird. The memory storing the sound data is immediately
CVE-2018-18500: Critical severity, CVSS 9.8 | Vulnix