CVE-2024-40776Network attack vector

Process crash via WebKit use-after-free

Published Jul 29, 2024 · Updated Apr 2, 2026

Use-after-free in WebKit across affected Apple operating systems and Safari allows remote attackers to crash the WebContent process. Apple identifies WebKit as the affected component but has not published the object, function, or lifetime error that leaves freed memory reachable. Processing maliciously crafted web content requires user interaction and interrupts only the rendering process; no data access, code execution, or system-wide shutdown is documented.

CVSS severity6.5
Medium
EPSS probability1.01%
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 operating systems and Safari allows remote attackers to crash the WebContent process. Apple identifies WebKit as the affected component but has not published the object, function, or lifetime error that leaves freed memory reachable. Processing maliciously crafted web content requires user interaction and interrupts only the rendering process; no data access, code execution, or system-wide shutdown is documented.

The record

CVE
CVE-2024-40776
Published
Jul 29, 2024
Updated
Apr 2, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-416, T1499
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

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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 <16.7.9
  2. Affected versionversion=0 <17.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

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 · watchOSversion=0 <10.6

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
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
T1499Endpoint Denial of Service

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

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Your stack

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