CVE-2025-43457Network attack vector

Process crash via mis-modeled JavaScriptCore array allocation

Published Nov 4, 2025 · Updated Nov 4, 2025

Use-after-free in WebKit in Apple Safari and affected operating systems before 26.1 allows remote attackers to crash Safari via crafted web content. JavaScriptCore's DFG ObjectAllocationSinking modeled an Array and its Butterfly through a reverse dependency at GetButterfly instead of separate allocations, allowing a freed object to remain in use. A victim must process attacker-controlled web content; the documented consequence is an unexpected Safari process crash, with no reported data access or code execution.

CVSS severity6.5
Medium
EPSS probability0.57%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in WebKit in Apple Safari and affected operating systems before 26.1 allows remote attackers to crash Safari via crafted web content. JavaScriptCore's DFG ObjectAllocationSinking modeled an Array and its Butterfly through a reverse dependency at GetButterfly instead of separate allocations, allowing a freed object to remain in use. A victim must process attacker-controlled web content; the documented consequence is an unexpected Safari process crash, with no reported data access or code execution.

The record

CVE
CVE-2025-43457
Published
Nov 4, 2025
Updated
Nov 4, 2025
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record 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=unspecified <26.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <26.1
Apple · visionOSversion=unspecified <26.1
Apple · Safariversion=unspecified <26.1
Apple · watchOSversion=unspecified <26.1

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
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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