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Apple Safari CVE-2026-43804

| EUVDEUVD-2026-49434 MEDIUM
Uncontrolled Resource Consumption (CWE-400)
2026-07-27 apple GHSA-mj89-jhh3-3x9r
Apple Denial Of Service Ios And Ipados Visionos Red Hat Suse
6.5
CVSS 3.1 · Vendor: apple
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Severity by source

Vendor (apple) PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
vuln.today AI
6.5 MEDIUM

Network-delivered via webpage visit (AV:N/AC:L), no authentication required (PR:N), but user must navigate to the site (UI:R); impact is crash-only with no data exposure (C:N/I:N/A:H).

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
6.5 MEDIUM
qualitative

Primary rating from Vendor (apple).

CVSS VectorVendor: apple

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jul 28, 2026 - 16:37 vuln.today
CVSS changed
Jul 28, 2026 - 16:22 NVD
6.5 (MEDIUM)
Patch available
Jul 27, 2026 - 21:17 EUVD
CVE Published
Jul 27, 2026 - 20:14 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 27, 2026 - 20:14 cve.org
MEDIUM 6.5

DescriptionCVE.org

This issue was addressed through improved state management. This issue is fixed in Safari 26.6, iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, visionOS 26.6. Visiting a website may lead to an app denial-of-service.

AnalysisAI

Safari and WebKit-based apps across Apple platforms crash when a user visits a specially crafted website, due to a state management flaw (CWE-400: Uncontrolled Resource Consumption) in versions prior to 26.6. Affected platforms include Safari on macOS Tahoe, iOS 26, iPadOS 26, and visionOS 26. No confidentiality or integrity impact is present - the consequence is an app-level denial-of-service. No public exploit code exists and CISA SSVC confirms no active exploitation, with EPSS at 0.16% (6th percentile), indicating very low exploitation likelihood at time of analysis.

Technical ContextAI

The root cause is CWE-400 (Uncontrolled Resource Consumption), a class of flaw where a program fails to properly limit resource usage, here triggered through improper state management in Apple's WebKit rendering engine - the engine underlying Safari and all iOS/iPadOS/visionOS in-app browsers. CPE data confirms the affected surface: cpe:2.3:a:apple:safari, cpe:2.3:a:apple:ios_and_ipados, cpe:2.3:a:apple:macos, and cpe:2.3:a:apple:visionos, all before version 26.6. Apple's fix description ('improved state management') suggests the engine failed to correctly track or release internal state during page rendering or script execution, allowing a malicious page to exhaust a resource and crash the hosting application.

RemediationAI

The primary fix is to update to the patched versions released by Apple: Safari 26.6, iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, and visionOS 26.6. These updates are available through standard Apple software update mechanisms and are documented in Apple's security advisories at https://support.apple.com/en-us/128066 (Safari), https://support.apple.com/en-us/128067 (iOS/iPadOS), https://support.apple.com/en-us/128070 (macOS Tahoe), and https://support.apple.com/en-us/128073 (visionOS). As a compensating control where immediate patching is not possible, restricting user access to untrusted or unknown websites via DNS filtering or web proxy content policies can reduce exposure, though this introduces usability trade-offs. There is no known server-side mitigation since the flaw is entirely client-side.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Performance Computing 15 SP7 Affected
SUSE Linux Enterprise Module for Basesystem 15 SP7 Affected
SUSE Linux Enterprise Module for Desktop Applications 15 SP7 Affected
SUSE Linux Enterprise Module for Development Tools 15 SP7 Affected

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CVE-2026-43804 vulnerability details – vuln.today
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