CVE-2026-76043Network attack vector

Sandboxed code execution via V8 miscompilation

Published Aug 18, 2026 · Updated Aug 20, 2026

Incorrect calculation in V8 in Google Chrome before 151.0.7922.169 allows remote attackers to execute code inside the sandbox via crafted HTML. Public V8 regression tests added after the release show TurboFan can miscompile long AdditiveSafeInteger addition chains by truncating them to Word32 or preserving exact integer sums after JavaScript should round once intermediates pass 2^53. Exploitation requires a victim to render a malicious page, and public sources do not disclose an out-of-sandbox escape or a more specific memory-corruption primitive.

CVSS severity8.8
High
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect calculation in V8 in Google Chrome before 151.0.7922.169 allows remote attackers to execute code inside the sandbox via crafted HTML. Public V8 regression tests added after the release show TurboFan can miscompile long AdditiveSafeInteger addition chains by truncating them to Word32 or preserving exact integer sums after JavaScript should round once intermediates pass 2^53. Exploitation requires a victim to render a malicious page, and public sources do not disclose an out-of-sandbox escape or a more specific memory-corruption primitive.

The record

CVE
CVE-2026-76043
Published
Aug 18, 2026
Updated
Aug 20, 2026
Vendor
Go standard library
Product
Google Chrome
Classifications
CWE-682, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=151.0.7922.169 <151.0.7922.169

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Go standard library · Google Chromeversion=151.0.7922.169 <151.0.7922.169

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-682Incorrect Calculation
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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