CVE-2026-43821Network attack vector

File disclosure via unrestricted temporary-directory loads

Published Jul 27, 2026 · Updated Jul 27, 2026

Improper access control in WebKit before 26.6 allows attackers to read files outside an app sandbox through local file loads. NetworkResourceLoader::isLocalFileLoadAllowed authorized resolved paths under the container temporary directory without requiring a sandbox extension. A user must run or interact with the malicious app, and the reported consequence is limited to disclosure of readable local files.

CVSS severity6.5
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in WebKit before 26.6 allows attackers to read files outside an app sandbox through local file loads. NetworkResourceLoader::isLocalFileLoadAllowed authorized resolved paths under the container temporary directory without requiring a sandbox extension. A user must run or interact with the malicious app, and the reported consequence is limited to disclosure of readable local files.

The record

CVE
CVE-2026-43821
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-284, T1005
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=0 <26.6
Apple · visionOSversion=0 <26.6
Apple · Safariversion=0 <26.6
Apple · tvOSversion=0 <26.6
Apple · macOSversion=0 <26.6
Apple · watchOSversion=0 <26.6

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/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-284Improper Access Control
T1005Data from Local System

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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