CVE-2024-40782Public exploitNetwork attack vector

Process crash via misparented ruby continuation cleanup

Published Jul 29, 2024 · Updated Apr 2, 2026

Use-after-free in WebKit across affected Apple platforms allows remote attackers to crash a web-content process with crafted HTML. WebCore mishandles display:ruby block continuations, leaves a previous renderer misparented, and releases it during RenderObject::destroy cleanup. A user must load attacker-controlled web content; the published consequence is process termination, with no reported code-execution impact.

CVSS severity6.5
Medium
EPSS probability0.98%
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 across affected Apple platforms allows remote attackers to crash a web-content process with crafted HTML. WebCore mishandles display:ruby block continuations, leaves a previous renderer misparented, and releases it during RenderObject::destroy cleanup. A user must load attacker-controlled web content; the published consequence is process termination, with no reported code-execution impact.

The record

CVE
CVE-2024-40782
Published
Jul 29, 2024
Updated
Apr 2, 2026
Vendor
Apple
Product
iOS
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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 <16.7
  2. Affected versionversion=0 <17.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOSversion=0 <16.7; version=0 <17.6
Apple · iOS and iPadOSversion=0 <16.7.9; version=0 <17.6
Apple · visionOSversion=0 <1.3
Apple · Safariversion=0 <17.6
Apple · tvOSversion=0 <17.6
Apple · macOSversion=0 <14.6
Apple · iPadOSversion=0 <16.7; version=0 <17.6
Apple · watchOSversion=0 <10.6

Published CVSS scores

6.5NIST National Vulnerability DatabaseCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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