Threat Intelligence / CVE / CVE-2026-5859

CVE-2026-5859 — Google Chrome

CVSS v3.1 8.8 (HIGH) · EPSS 0.0% (higher than 23.3% of all scored CVEs) · Priority 5.3/10 · Published 2026-04-08

As of 2026-04-13, CVE-2026-5859 is a HIGH-severity vulnerability in Google Chrome, CVSS v3.1 8.8, EPSS 0.0% (23.3th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-5859, most recently “Microsoft April 2026 Patch Tuesday — 163 CVEs / 88 Advisories (CVE-2026-32201 SharePoint Zero-Day Exploited In-The-Wild, CVE-2026-33825 Defender EoP Public PoC, CVE-2026-33824 IKE RCE CVSS 9.8, CVE-2026-33827 TCP/IP Wormable RCE)”.

Last updated: 2026-04-13

What is CVE-2026-5859?

Integer overflow in WebML in Google Chrome prior to 147.0.7727.55 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page.

The record classifies CVE-2026-5859 under weakness class CWE-472. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 4 affected-product entries are recorded, across 4 vendors, listed below. The identifier was first published 157 days ago.

Severity and exploitation probability

CVSS v3.1 base score
8.8 — HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (FIRST)
0.0% probability of exploitation in the next 30 days, higher than 23.3% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
5.3/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-04-08, last modified 2026-04-13

Is CVE-2026-5859 being exploited?

It currently carries a trending score of 11 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-5859

The record marks a vendor fix as available for CVE-2026-5859. Vendor advisory: https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-5859

1 tracked threat in the Threadlinqs corpus references CVE-2026-5859, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2026-5859 are available via the Threadlinqs MCP server (Purple tier). View plans →

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