CVE-2016-1646: Google Chromium V8 Out-of-Bounds Read Vulnerability

Q: How do I fix CVE-2016-1646?

debian linux: mitigate or apply the listed mitigation; ubuntu linux: mitigate or apply the listed mitigation; chrome: upgrade to 49.0.2623.108. Exact commands for each OS are on this page.

Q: Is CVE-2016-1646 being exploited?

Yes. CVE-2016-1646 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

Q: What does CVE-2016-1646 affect?

CVE-2016-1646 affects debian linux, ubuntu linux, chrome. Severity is high (CVSS 8.8). The Array.prototype.concat implementation in builtins.cc in Google V8, as used in Google Chrome before 49.0.2623.108, does not properly consider element data types, which allows remote attackers to cause a denial of service (out-of-bounds r

Q: How urgent is CVE-2016-1646?

Priority 91/100. High severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; On your watchlist

Patch now

HIGH 8.8EXPLOITEDWATCHLISTMITIGATEMITIGATEUPGRADE

CVE-2016-1646 is a high-severity flaw (CVSS 8.8) affecting debian linux, ubuntu linux, chrome, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Array.prototype.concat implementation in builtins.cc in Google V8, as used in Google Chrome before 49.0.2623.108, does not properly consider element data types, which allows remote attackers to cause a denial of service (out-of-bounds read) or possibly have unspecified other impact via crafted JavaScript code.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Exploited in the wild (CISA KEV)
Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	48.1% (top 1%)
CISA exploited list	Yes, fix due 2022-06-22
Weakness	CWE-125
Published	2016-03-29
Last modified	2026-06-17

Publisher (CNA): Chrome · Vendor: canonical · debian · google · opensuse · suse

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2016-03-29 10:59 UTCPublished CVE record published
2022-06-08Exploited Added to the CISA Known Exploited Vulnerabilities list
2022-06-22Deadline CISA due date for US federal agencies to patch
2026-06-17 00:42 UTCUpdated Record last modified

debian debian linux MITIGATE

Affected: 8.0 · 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

canonical ubuntu linux MITIGATE

Affected: 14.04 · 15.10 · 16.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 14.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

google chrome UPGRADE

Affected: < 49.0.2623.108

Fixed in: 49.0.2623.108

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy chrome || rpm -q chrome || chrome --version

2. UPGRADE to 49.0.2623.108 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade chrome

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade chrome

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

suse package hub MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy package-hub || rpm -q package-hub || package-hub --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

opensuse leap MITIGATE

Affected: 42.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 42.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

opensuse opensuse MITIGATE

Affected: 13.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 13.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · perl-Net-IDN-Encode · FIXED · 2.600-1.fc46 · FEDORA-2026-84eff0ea64 · source

sudo dnf upgrade --advisory=FEDORA-2026-84eff0ea64

Fedora ELN · libXISF · FIXED · 0.2.15-2.eln159 · FEDORA-2026-b9e2d1bda0 · source

sudo dnf upgrade --advisory=FEDORA-2026-b9e2d1bda0

RHEL 6 Supplementary · chromium-browser · FIXED · chromium-browser-49.0.2623.108-1.el6

sudo dnf upgrade --advisory=RHSA-2016:0525 rpm -q chromium-browser

Verify at the official source NVD · CVE Program · CISA KEV catalog · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2016-1646?

debian linux: mitigate or apply the listed mitigation; ubuntu linux: mitigate or apply the listed mitigation; chrome: upgrade to 49.0.2623.108. Exact commands for each OS are on this page.

Is CVE-2016-1646 being exploited?

Yes. CVE-2016-1646 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.

What does CVE-2016-1646 affect?

CVE-2016-1646 affects debian linux, ubuntu linux, chrome. Severity is high (CVSS 8.8). The Array.prototype.concat implementation in builtins.cc in Google V8, as used in Google Chrome before 49.0.2623.108, does not properly consider element data types, which allows remote attackers to cause a denial of service (out-of-bounds r

How urgent is CVE-2016-1646?

Priority 91/100. High severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; On your watchlist

Software pages

Ubuntu vulnerabilities · Debian vulnerabilities · Google Chrome vulnerabilities · Chromium vulnerabilities

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References

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