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Fencer Intel
high 8.8

CVE-2018-18342 json

Execution of user supplied Javascript during object deserialization can update object length leading to an out of bounds write in V8 in Goo…

published 2018-12-11 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-10073

cvss
8.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

Execution of user supplied Javascript during object deserialization can update object length leading to an out of bounds write in V8 in Google Chrome prior to 71.0.3578.80 allowed a remote attacker to execute arbitrary code inside a sandbox via a crafted HTML page.

Patch / fix

  • Google Chrome 71.0.3578.80
  • chromium Debian 14, Debian 13, Debian 12 71.0.3578.80-1

debian advisories DEBIAN-CVE-2018-18342

  • chromium-browser Ubuntu 16.04 LTS 71.0.3578.80-0ubuntu0.16.04.1
  • chromium-browser Ubuntu 18.04 LTS 71.0.3578.80-0ubuntu0.18.04.1

ubuntu advisories UBUNTU-CVE-2018-18342

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • chromium-browser RHEL 6 EXTRAS 71.0.3578.80-1.el6_10

red hat advisories RHSA-2018:3803

  • chromium openSUSE Tumbleweed 93.0.4577.82-1.1
  • chromium openSUSE Tumbleweed 113.0.5672.92-1.1
  • chromium Package Hub 12 SP2 71.0.3578.98-80.1

opensuse advisories openSUSE-SU-2024:10681-1openSUSE-SU-2024:12948-1openSUSE-SU-2018:4143-1

  • chromium Arch Linux 71.0.3578.80-1

arch linux advisories AVG-824

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-18342 updated cvss 8.8

chromium-browser: Out of bounds write in V8

  • Red Hat Enterprise Linux Desktop Supplementary (v. 6) chromium-browser 71.0.3578.80-1.el6_10 Red Hat Enterprise Linux Server Supplementary (v. 6) chromium-browser 71.0.3578.80-1.el6_10 Red Hat Enterprise Linux Workstation Supplementary (v. 6) chromium-browser 71.0.3578.80-1.el6_10
    fixed: vendor fix RHSA-2018:3803

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.65% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.0 8.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

Affected products

  • Google Chrome

Classification

Weakness
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.