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CVE-2026-15903 is a high-severity out-of-bounds read and write vulnerability in the V8 JavaScript engine used by Google Chrome before version 150.0.7871.128. V8's optimizing compiler can omit a safety check during integer conversion, permitting an out-of-bounds array index. Malicious JavaScript in a crafted HTML page can use this condition to read from or overwrite memory within the V8 heap sandbox.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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No public exploit code observed for this vulnerability.
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.
23 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity out-of-bounds read/write vulnerability in Chrome's V8 engine.
Out-of-bounds read/write vulnerability in Google's V8 JavaScript engine that allows remote code execution inside the sandbox via a crafted HTML page; notable because it was reportedly discovered by GPT-5.6-Cyber and could be chained with a second flaw for a V8 sandbox escape.
A high-severity out-of-bounds read/write vulnerability in the V8 JavaScript engine that could enable arbitrary code execution inside a sandbox via a crafted HTML page, and may be chained with another flaw to escape the V8 heap sandbox.
A vulnerability identifier assigned to issues in Chrome's V8 engine that OpenAI says could be chained to cause memory corruption and escape the browser sandbox.
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.