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TI-2018-13084 Aliases CVE-2018-18500GHSA-6hxm-h9g7-cg3m

A use-after-free vulnerability can occur while parsing an HTML5 stream in concert with…

Priority MEDIUM 56CWE-416Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

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.

Why it matters now

EPSS 0.12658 96th percentileScored 2026-11-07
Fix Fixed Red Hat: 4 advisories

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 18

CPEVersionsRoleVendor
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*before 65.0VulnerableMozilla
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*before 60.5VulnerableMozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*before 60.5VulnerableMozilla
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*14.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*18.10VulnerableCanonical
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
  • cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 65.0 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 60.5 Vulnerable ·Mozilla
  • cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 60.5 Vulnerable ·Mozilla
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* Versions 18.10 Vulnerable ·Canonical
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
Show 8 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*6.0VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*7.0VulnerableRed Hat
  • cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:* Versions 6.0 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* Versions 7.0 Vulnerable ·Red Hat

Remediation

Red Hat 4 advisories

  • RHSA-2019:0269 Released 2019-02-04 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Desktop (v. 6) thunderbird-60.5.0-1.el6_10
    • Red Hat Enterprise Linux Server Optional (v. 6) thunderbird-60.5.0-1.el6_10
    • Red Hat Enterprise Linux Workstation (v. 6) thunderbird-60.5.0-1.el6_10
  • RHSA-2019:0270 Released 2019-02-04 · Red Hat rating Important
    thunderbird security update
    • Red Hat Enterprise Linux Client (v. 7) thunderbird-60.5.0-1.el7_6
    • Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-60.5.0-1.el7_6
    • Red Hat Enterprise Linux Workstation (v. 7) thunderbird-60.5.0-1.el7_6
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) thunderbird-60.5.0-1.el7_6
  • RHSA-2019:0219 Released 2019-01-30 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux Client (v. 7) firefox-60.5.0-2.el7
    • Red Hat Enterprise Linux Client Optional (v. 7) firefox-60.5.0-2.el7
    • Red Hat Enterprise Linux Server (v. 7) firefox-60.5.0-2.el7
    • Red Hat Enterprise Linux Server Optional (v. 7) firefox-60.5.0-2.el7
    • Red Hat Enterprise Linux Workstation (v. 7) firefox-60.5.0-2.el7
    • Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-60.5.0-2.el7
    • Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) firefox-60.5.0-2.el7
Show 1 more Red Hat advisories
  • RHSA-2019:0218 Released 2019-01-30 · Red Hat rating Critical
    firefox security update
    • Red Hat Enterprise Linux Desktop (v. 6) firefox-60.5.0-2.el6
    • Red Hat Enterprise Linux Desktop Optional (v. 6) firefox-60.5.0-2.el6
    • Red Hat Enterprise Linux HPC Node Optional (v. 6) firefox-60.5.0-2.el6
    • Red Hat Enterprise Linux Server (v. 6) firefox-60.5.0-2.el6
    • Red Hat Enterprise Linux Server Optional (v. 6) firefox-60.5.0-2.el6
    • Red Hat Enterprise Linux Workstation (v. 6) firefox-60.5.0-2.el6
    • Red Hat Enterprise Linux Workstation Optional (v. 6) firefox-60.5.0-2.el6

Vendor assessments

Red Hat

Red Hat rating: Critical. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2019:0219, RHSA-2019:0270
Red Hat Enterprise Linux Client Optional (v. 7)Fixed RHSA-2019:0219
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2019:0218, RHSA-2019:0269
Red Hat Enterprise Linux Desktop Optional (v. 6)Fixed RHSA-2019:0218
Red Hat Enterprise Linux HPC Node Optional (v. 6)Fixed RHSA-2019:0218
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2019:0218
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2019:0219
Red Hat Enterprise Linux Server Optional (v. 6)Fixed RHSA-2019:0218, RHSA-2019:0269
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2019:0219, RHSA-2019:0270
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2019:0218, RHSA-2019:0269
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2019:0219, RHSA-2019:0270
Red Hat Enterprise Linux Workstation Optional (v. 6)Fixed RHSA-2019:0218
Red Hat Enterprise Linux Workstation Optional (v. 7)Fixed RHSA-2019:0219
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7)Fixed RHSA-2019:0219
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7)Fixed RHSA-2019:0270
Not affected: 1 product
  • Red Hat Enterprise Linux 8

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-18500
  2. 2026-10-03 Alias added: GHSA-6hxm-h9g7-cg3m

References

Advisory 16

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences