CVE-2026-64787Network attack vector

Process termination via WebKit use-after-free

Published Aug 17, 2026 · Updated Aug 18, 2026

Use-after-free in WebKit in Apple Safari before 26.6.1 and macOS before 26.6.2 allows attackers to crash a process via malicious web content. Apple describes the flaw only as a WebKit use-after-free fixed by improved memory management and does not identify a more specific function, file, or parser that retains a stale reference to freed memory. Reachability requires rendering attacker-controlled web content, and published scoring bounds the impact to unexpected process termination rather than code execution, privilege gain, or data access.

CVSS severity6.5
Medium
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Use-after-free in WebKit in Apple Safari before 26.6.1 and macOS before 26.6.2 allows attackers to crash a process via malicious web content. Apple describes the flaw only as a WebKit use-after-free fixed by improved memory management and does not identify a more specific function, file, or parser that retains a stale reference to freed memory. Reachability requires rendering attacker-controlled web content, and published scoring bounds the impact to unexpected process termination rather than code execution, privilege gain, or data access.

The record

CVE
CVE-2026-64787
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
Apple
Product
Safari
Classifications
CWE-416
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <26.6.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · Safariversion=0 <26.6.1
Apple · macOSversion=0 <26.6.2

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/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-416Use After Free

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo