Out-of-bounds read in Google V8 Array.prototype.concat
CVE-2016-1646 is an out-of-bounds read vulnerability in the Array.prototype.concat implementation in Google V8, specifically in builtins.cc, as used by Google Chrome before 49.0.2623.108. The flaw stems from improper handling of element data types during concat operations. A remote attacker can trigger the bug by supplying crafted JavaScript that causes V8 to incorrectly process array element representations, leading to an out-of-bounds memory read. The published description notes denial of service as a demonstrated outcome and leaves open the possibility of additional unspecified impact.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Google Chrome vulnerability used as one of the Android browser exploits in the MOONSHINE exploit kit.
A Chromium vulnerability targeted by the MOONSHINE exploit kit against Android apps embedding vulnerable Chrome versions.
A Google Chrome vulnerability (used here as part of the MOONSHINE Android exploit kit) enabling browser exploitation on specific Chrome versions.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.