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Apple WebKit CVE-2026-28955

| EUVDEUVD-2026-29260 HIGH
Buffer Overflow (CWE-119)
2026-05-11 apple GHSA-q34x-fmmg-9c36
Apple Buffer Overflow Ios And Ipados Tvos Visionos Watchos
8.8
CVSS 3.1 · Vendor: apple
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Severity by source

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

Network-delivered web content with required user interaction (UI:R); Apple substantiates only a single-process crash, so C:N/I:N and A:L rather than the NVD C:H/I:H/A:H.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
4.0 AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
SUSE
7.5 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Red Hat
8.8 HIGH
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
High
Availability
High

Lifecycle Timeline

7
Analysis Generated
Jul 23, 2026 - 23:41 vuln.today
CVSS changed
Jun 30, 2026 - 03:24 NVD
7.5 (HIGH) 8.8 (HIGH)
CVSS changed
May 12, 2026 - 20:22 NVD
7.5 (HIGH)
Patch available
May 11, 2026 - 22:18 EUVD
CVE Published
May 11, 2026 - 20:07 nvd
HIGH 7.5
CVE Published
May 11, 2026 - 20:07 nvd
UNKNOWN (no severity yet)
CVE Published
May 11, 2026 - 20:07 cve.org
HIGH 8.8

DescriptionCVE.org

The issue was addressed with improved memory handling. This issue is fixed in iOS 18.7.9 and iPadOS 18.7.9, iOS 26.5 and iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, watchOS 26.5. Processing maliciously crafted web content may lead to an unexpected process crash.

AnalysisAI

Memory-safety corruption (CWE-119) in Apple's web content engine allows a remote attacker who lures a victim to a malicious page to crash the WebKit rendering process across iOS/iPadOS, macOS Tahoe, tvOS, visionOS and watchOS. Reported by Apple and fixed in iOS/iPadOS 18.7.9 and 26.5 and the 26.5 releases of the other platforms; there is no public exploit identified at time of analysis, EPSS is very low (0.03%), and CISA SSVC records exploitation status as none. Note a signal conflict: the NVD vector claims full confidentiality/integrity/availability impact (C:H/I:H/A:H) while Apple's description substantiates only 'an unexpected process crash.'

Technical ContextAI

The flaw is in the code path that processes untrusted web content, i.e. Apple's WebKit browser/rendering engine that backs Safari, the in-app WebView (WKWebView) and any component that renders HTML/JavaScript across all listed operating systems. CWE-119 (improper restriction of operations within the bounds of a memory buffer) and the 'Buffer Overflow' tag indicate the root cause is an out-of-bounds memory access when parsing or laying out crafted markup, script or media. Apple states it was 'addressed with improved memory handling,' which is Apple's standard phrasing for bounds/allocation hardening in the affected parser. The CPE set (apple:ios_and_ipados, apple:macos, apple:tvos, apple:visionos, apple:watchos) confirms the shared engine spans the entire Apple OS family.

RemediationAI

Vendor-released patch: update to iOS 18.7.9 / iPadOS 18.7.9, or iOS 26.5 / iPadOS 26.5, macOS Tahoe 26.5, tvOS 26.5, visionOS 26.5, and watchOS 26.5, following the matching Apple advisory (support.apple.com/en-us/127110 through 127121 for the specific platform). Because the fix is a memory-handling correction inside WebKit there is no reliable configuration-only workaround; as interim compensating controls you can disable JavaScript in Safari (Settings > Safari > Advanced) which breaks most modern sites, restrict browsing to trusted sites or route traffic through a filtering proxy/MDM web-content policy to reduce exposure to malicious pages, and enable Lockdown Mode on high-risk devices (which aggressively restricts WebKit features at the cost of usability). These controls only lower the odds of reaching the vulnerable code path and are not substitutes for installing the patched OS version.

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Vendor StatusVendor

SUSE

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

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CVE-2026-28955 vulnerability details – vuln.today
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