CVE-2026-64779Network attack vector

Browser crash via WebKit Storage race

Published Aug 17, 2026 · Updated Aug 18, 2026

Memory corruption in WebKit Storage in Apple Safari before 26.6.1 and macOS before 26.6.2 allows remote attackers to crash Safari via crafted web content. Apple attributes the flaw to WebKit Storage and states that improved locking fixed it, while CISA-ADP maps the issue to CWE-362, indicating improper synchronization around shared storage state that can corrupt memory during concurrent access. Reachability requires attacker-controlled web content to be rendered in a WebKit browser context, and the public record describes an unexpected Safari crash rather than code execution, data disclosure, or privilege gain.

CVSS severity3.1
Low
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in WebKit Storage in Apple Safari before 26.6.1 and macOS before 26.6.2 allows remote attackers to crash Safari via crafted web content. Apple attributes the flaw to WebKit Storage and states that improved locking fixed it, while CISA-ADP maps the issue to CWE-362, indicating improper synchronization around shared storage state that can corrupt memory during concurrent access. Reachability requires attacker-controlled web content to be rendered in a WebKit browser context, and the public record describes an unexpected Safari crash rather than code execution, data disclosure, or privilege gain.

The record

CVE
CVE-2026-64779
Published
Aug 17, 2026
Updated
Aug 18, 2026
Vendor
Apple
Product
Safari
Classifications
CWE-362
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

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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=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

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

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.

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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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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