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CVE-2026-5859 Google CVE debrief

CVE-2026-5859 is an integer overflow vulnerability in WebML in Google Chrome prior to 147.0.7727.55. This CVE record was published on 2026-04-08T22:16:25.383Z and was last modified on 2026-07-24T08:10:00.150Z. The NVD entry is currently Analyzed. The vulnerability could allow a remote attacker to potentially exploit heap corruption via a crafted HTML page. The Chromium security severity is Critical, with a CVSS score of 8.8. Users of Google Chrome prior to version 147.0.7727.55 should update to the latest version to mitigate this vulnerability.

Vendor
Google
Product
Chrome
CVSS
HIGH 8.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-04-08
Original CVE updated
2026-07-24
Advisory published
2026-04-08
Advisory updated
2026-07-24

Who should care

Users of Google Chrome prior to version 147.0.7727.55 should update to the latest version to mitigate this vulnerability. This includes administrators and users of Google Chrome on various platforms, including Windows, macOS, and Linux. Vulnerability management and security teams should prioritize patching and review compensating controls for exposed systems.

Technical summary

The vulnerability is an integer overflow in WebML in Google Chrome prior to 147.0.7727.55. This could allow a remote attacker to potentially exploit heap corruption via a crafted HTML page. The Chromium security severity is Critical, with a CVSS score of 8.8. The vulnerability affects Google Chrome users who have not updated to version 147.0.7727.55 or later. Affected product deployments should be confirmed in managed environments, and owners should be assigned for follow-up. Review of official advisories or CVE records is necessary to validate affected scope, severity, and vendor guidance. Planning for vendor-supported updates or mitigations through normal change control is recommended where exposure is confirmed. Additionally, reviewing compensating controls for exposed systems while remediation is scheduled and verified is crucial. Relevant monitoring, detection, and logs for exposed assets should be checked, and exceptions should be tracked and retested.

Defensive priority

High

Recommended defensive actions

  • Update Google Chrome to version 147.0.7727.55 or later
  • Review and apply vendor advisories
  • Monitor for suspicious activity
  • Implement compensating controls
  • Perform regular vulnerability scans
  • Review exposure and apply mitigations
  • Track exceptions and retest remediated assets

Evidence notes

The CVE record was published on 2026-04-08T22:16:25.383Z and was last modified on 2026-07-24T08:10:00.150Z. The NVD entry is currently Analyzed. Evidence is limited to public sources and may not reflect the full scope or impact of this vulnerability. Defenders should verify affected systems and apply patches or mitigations as needed.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-5859 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-5859

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-5859 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-5859

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.