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Apple Safari CVE-2026-43740

| EUVDEUVD-2026-40212 MEDIUM
Buffer Overflow (CWE-119)
2026-06-29 apple GHSA-xxx6-g6jv-xq96
Buffer Overflow Apple Ios And Ipados
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:H/I:N/A:N
vuln.today AI
6.5 MEDIUM

Network-reachable via web content with no privileges; UI:R because a page visit is required; C:H for process memory disclosure; no integrity or availability impact.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
SUSE
HIGH
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
High
Integrity
None
Availability
None

Lifecycle Timeline

5
Analysis Generated
Jun 29, 2026 - 22:40 vuln.today
CVSS changed
Jun 29, 2026 - 22:22 NVD
6.5 (MEDIUM)
Patch available
Jun 29, 2026 - 22:02 EUVD
CVE Published
Jun 29, 2026 - 19:43 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 29, 2026 - 19:43 cve.org
MEDIUM 6.5

DescriptionCVE.org

The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2. Processing maliciously crafted web content may result in the disclosure of process memory.

AnalysisAI

Safari, iOS/iPadOS, and macOS Tahoe expose process memory when the browser engine processes maliciously crafted web content, rooted in a CWE-119 improper memory buffer restriction (tagged Buffer Overflow). The CVSS vector (AV:N/AC:L/PR:N/UI:R/C:H) indicates a network-reachable, low-complexity attack requiring only that the victim visit or render attacker-controlled content, resulting in high confidentiality impact through memory leakage. No active exploitation has been confirmed in CISA KEV and no public proof-of-concept has been identified at the time of analysis; Apple has released patched versions (26.5.2) across all affected platforms.

Technical ContextAI

The vulnerability resides in Apple's web content processing layer - almost certainly WebKit, the rendering engine shared across Safari, iOS/iPadOS WKWebView, and macOS. CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer) indicates a failure to enforce buffer boundaries during content parsing or layout, permitting reads from regions of process memory that should be inaccessible to the web layer. This class of flaw in browser engines typically manifests in DOM parsing, JavaScript JIT compilation, or media/resource decoding pipelines. The affected CPE strings cover cpe:2.3:a:apple:safari, cpe:2.3:a:apple:ios_and_ipados, and cpe:2.3:a:apple:macos across all versions prior to 26.5.2, confirming the shared WebKit codebase as the root locus. Memory disclosure bugs of this class can leak heap pointers, session tokens, cached credentials, or other process-resident sensitive data to attacker-controlled JavaScript or network responses.

RemediationAI

The primary fix is to upgrade to the patched versions released by Apple: Safari 26.5.2, iOS 26.5.2 and iPadOS 26.5.2, and macOS Tahoe 26.5.2. Updates are available through Software Update on macOS and Settings > General > Software Update on iOS/iPadOS. iOS and iPadOS users should prioritize this update given the platform's broad consumer exposure and typically slower enterprise patch cadence. For environments where immediate updates are not feasible, a compensating control is to restrict access to untrusted or external web content by enforcing content filtering at the network layer or configuring managed device policies to block untrusted browsing; however, this does not eliminate the attack surface for socially engineered or email-delivered links. No workaround eliminates the underlying memory handling flaw short of patching. Advisory references: https://support.apple.com/en-us/127594 (Safari), https://support.apple.com/en-us/127595 (iOS/iPadOS), https://support.apple.com/en-us/127685 (macOS).

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Liberty Linux 8 Fixed
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Affected
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Affected
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Affected

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CVE-2026-43740 vulnerability details – vuln.today
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