CVE-2024-40789Network attack vector

Information disclosure via WebCodecs buffer over-read

Published Jul 29, 2024 · Updated Apr 2, 2026

Out-of-bounds read in WebKit on affected Apple platforms allows remote attackers to disclose data through malicious web content. The VideoFrame WebCodecs API fails to validate user-supplied data before reading past the end of an allocated buffer. Exploitation requires a user to visit a malicious page or open a malicious file; Apple reports a process crash, while ZDI identifies limited disclosure and possible chaining with other flaws.

CVSS severity6.5
Medium
EPSS probability1.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in WebKit on affected Apple platforms allows remote attackers to disclose data through malicious web content. The VideoFrame WebCodecs API fails to validate user-supplied data before reading past the end of an allocated buffer. Exploitation requires a user to visit a malicious page or open a malicious file; Apple reports a process crash, while ZDI identifies limited disclosure and possible chaining with other flaws.

The record

CVE
CVE-2024-40789
Published
Jul 29, 2024
Updated
Apr 2, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-125, T1203
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

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.3Trend Micro Zero Day InitiativeCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

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-125Out-of-bounds Read
T1203Exploitation for Client Execution

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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