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Apexward Pulse
Type Vulnerability

Google · Memory corruption

Google Chromium WebP Heap-Based Buffer Overflow Vulnerability

2 sourcesCVE-2023-4863CVE-2026-16436CVE-2026-16437+1 more

At a glance

High
Suggested 24-hour window, counted from the last update
ActiveConfirmed in-the-wild exploitation
Evidence-weighted, not popularity
Signal

Actively exploited in the wild — prioritise confirming exposure.

Why High

High rather than Critical: exposure is scored at a default because we cannot see your systems or suppliers. If you run or depend on Google Chrome, treat it as Critical.

Briefing

  • Organisations using Google Chromium should assess their exposure to this vulnerability and monitor for potential exploitation attempts.
  • The high probability score suggests urgent attention is required to mitigate potential risks associated with this vulnerability.

Questions to ask IT

  • Do we run Google Chrome, Mozilla Firefox, Mozilla Thunderbird and 2 more, and which versions?
  • Is any of it reachable from the internet?
  • Have we checked whether it has already been used against us?
  • If it is still not patched, what mitigation is in place, and what is holding the fix up?

Next steps

  1. Confirm exposure and remediation status for affected products

Summary

  • A vulnerability in Google Chromium's WebP component could allow attackers to execute arbitrary code, bypass authentication, or cause system denial-of-service conditions.
  • CVE-2023-4863 is confirmed as exploited in the wild, with an estimated 100% chance of attack within 30 days.

Read the original reportCISA Cybersecurity Advisories(opens in a new tab)

Products and services involved

Pulse

Last checked yesterday · Recheck overdue since 8 Nov 2026, 10:33 UK time

  1. Story3 Nov 2026, 12:04 UK time · 5d ago

    Linked reporting from CISA Cybersecurity Advisories (official authority).

    Read source (CISA Cybersecurity Advisories)
  2. Story3 Nov 2026, 12:04 UK time · 5d ago

    Linked reporting from CISA ICS Advisories (official authority).

    Read source (CISA ICS Advisories)

2 entries so far. The timeline chart appears once this story has more history.

Sources

How we know

Statements extracted from sources. Higher confidence means stronger corroboration.

  • ClaimedHeadline60% confidence

    Google Chromium WebP Heap-Based Buffer Overflow Vulnerability

  • ProbableSummary fact75% confidence

    View CSAF Summary Successful exploitation of these vulnerabilities could allow an attacker to execute arbitrary code (CVE-2023-4863), bypass authentication (CVE-2026-16436 and CVE-2026-16437), or perform arbitrary operations (CVE-2026-16438), resulting in information disclosure, tampering with, destruction, or deletion of information, and a denial-of-service (DoS) condition of the system.

  • ConfirmedCVE identifier95% confidence

    Event involves CVE-2023-4863

  • ConfirmedKnown-exploited catalogue98% confidence

    CVE-2023-4863 is confirmed as exploited in the wild (US known-exploited catalogue)

  • ConfirmedEstimated attack likelihood95% confidence

    CVE-2023-4863 has an estimated ~100% chance of attack in 30 days (100th percentile) as of 2026-11-02 — probability signal, not confirmed exploitation

  • ConfirmedCVE identifier95% confidence

    Event involves CVE-2026-16436

  • ConfirmedCVE identifier95% confidence

    Event involves CVE-2026-16437

  • ConfirmedCVE identifier95% confidence

    Event involves CVE-2026-16438