Apple Safari CVE-2026-43720

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EUVD

EUVD-2026-40217 MEDIUM

Use After Free (CWE-416)

2026-06-29 apple

GHSA-wvfc-f72q-gqc3

Denial Of Service Use After Free Memory Corruption Apple Ios And Ipados

6.5

CVSS 3.1 · Vendor: apple

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Host maliciously crafted webpage
Delivery

Lure victim to visit URL via phishing or ad injection
Exploit

Safari loads and parses crafted web content
Execution

Use-after-free triggered in WebKit rendering engine
Impact

Safari crashes (denial of service)

Vulnerability Assessment

Weakness	CWE CWE-416 ASVS 5.0 V15 - Secure Coding and Architecture Memory lifecycle management MITRE ATT&CK 2 techniques across 2 tactics: Execution, Privilege Escalation The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Exploitation requires the victim to actively visit or be redirected to a page hosting maliciously crafted web content in an unpatched Safari browser (UI:R). No authentication, account, or privileged configuration is required on the attacker's side (PR:N), and the attack is deliverable over the network (AV:N) with low complexity (AC:L). The critical limiting factor is user interaction - the victim must load the malicious content in Safari; a passive network position alone is insufficient. The impact is strictly limited to a browser crash (A:H, C:N, I:N): no code execution, no data leakage, and no persistence mechanism are indicated by available data. On iOS and iPadOS, all browsers share the WebKit engine, expanding the affected surface beyond Safari-branded usage.
Impact	The CVSS 3.1 score of 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H) accurately reflects a remotely triggerable browser crash requiring only a single user interaction - visiting a malicious page. The availability impact is rated High (full application crash), but confidentiality and integrity are both None, meaning this is a pure denial-of-service with no data theft or persistent compromise path confirmed by available data. No EPSS score was provided in the input, so exploitation probability cannot be quantified numerically. The vulnerability is not listed in CISA KEV, and no public proof-of-concept code has been identified, further reducing immediate operational risk. Patches are already available from Apple across all affected platforms, which should dramatically reduce the window of exposure for patched environments. The real-world priority is moderate: browser crashes are disruptive for end users but do not enable lateral movement, data exfiltration, or persistent access, making this lower urgency than a code-execution or privilege-escalation class flaw in the same product.
Exploit ScenarioDerived	An attacker registers or compromises a website and embeds specially crafted web content - such as malformed HTML, JavaScript, or media assets - designed to trigger the use-after-free condition in Safari's rendering engine. A victim browsing to that page with an unpatched Safari version experiences an abrupt browser crash. No public exploit code is known at time of analysis, but the low attack complexity (AC:L) suggests that a working exploit would be straightforward to develop once the root cause is understood.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).

Patch available 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Jun 29, 2026

Use-after-free memory corruption in Safari's web content rendering engine causes a denial-of-service crash on Apple platforms running Safari, iOS/iPadOS, and macOS Tahoe prior to version 26.5.2. An attacker who can lure a victim to visit a maliciously crafted webpage can reliably crash the Safari browser, with no code execution or data exfiltration indicated by the available CVSS impact scores (C:N/I:N). No public exploit code and no CISA KEV listing have been identified at time of analysis, placing this in the category of a significant but non-critical browser crash vulnerability.

RemediationAI

Apply vendor-released patches immediately: update to Safari 26.5.2, iOS and iPadOS 26.5.2, or macOS Tahoe 26.5.2 as applicable. These updates are available through Apple Software Update and the App Store. Advisory references confirming the fix are https://support.apple.com/en-us/127594, https://support.apple.com/en-us/127595, and https://support.apple.com/en-us/127685. As a compensating control where immediate patching is not feasible, users can avoid browsing to untrusted or unknown websites in Safari and consider using Content Security Policy-enforcing browser extensions to block execution of arbitrary third-party scripts. Note that on iOS and iPadOS all browsers use WebKit and are equally affected regardless of browser brand; patch deployment via MDM is the only reliable enterprise mitigation on those platforms.

Affected VersionsENISA

iOS and iPadOS 0 <26.5.2

macOS 0 <26.5.2

Safari 0 <26.5.2

Affected Packages

euvd ios_and_ipados fix: 26.5.2

euvd macos fix: 26.5.2

euvd safari fix: 26.5.2

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 3 packages in euvd

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Technical ContextAI · show details

CWE-416 (Use After Free) describes a class of memory safety flaw where a program continues to use a pointer to a heap-allocated object after that memory has been freed. In Safari's case, the flaw resides in the web content processing pipeline - almost certainly Apple's WebKit rendering engine, which underpins Safari on all Apple platforms and is mandated for all third-party browsers on iOS/iPadOS. Affected CPEs confirm the scope: cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*, cpe:2.3:a:apple:ios_and_ipados:*:*:*:*:*:*:*:*, and cpe:2.3:a:apple:macos:*:*:*:*:*:*:*:*. The use-after-free is triggered by processing specially crafted HTML, CSS, JavaScript, or media content; Apple's fix involved improved memory management to ensure object lifetimes are correctly tracked before dereferencing.

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Exploit and PoC references, threat intelligence from 22 sources

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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 web content requires active user visit (UI:R); crash is availability-only with no confidentiality or integrity impact confirmed.

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 HIGH

Red Hat 6.5 MEDIUM

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

4

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

A use-after-free issue was addressed with improved memory management. 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 lead to an unexpected Safari crash.

Threat Intelligence Overview

EPSS Score

0.3%

Top 79% exploitable

Prevalence

High

default browser on hundreds of millions of Apple devices globally

Social Media

1

Sightings

Data Quality

7 sources

Confidence: High

EUVD

CVE.org

EPSS

Vulnrichment Vendor CIRCL

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity MEDIUM

CISA KEV No

Public POC No

EPSS 0.3%

Patch available Yes

Active threat No

Deciding rule

MEDIUM severity (CVSS 4.0-6.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation

None

System Exposure· derived

Open

Automatable

No

Human Impact· derived

High

Technical Impact

Partial

Priority Score

32

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +32

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Use After Free HIGH

Use-after-free vulnerabilities occur when a program continues to access memory through a pointer after that memory has been deallocated.

Memory Corruption HIGH

Memory corruption occurs when a program writes data beyond the boundaries of allocated memory regions or accesses memory in unintended ways, violating the integrity of the process's address space.

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

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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

References

Advisories & patches

ADVISORY https://access.redhat.com/errata/RHSA-2026:42062 ADVISORY https://access.redhat.com/errata/RHSA-2026:42088 ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-43720 ADVISORY https://vuldb.com/vuln/374743 REF https://support.apple.com/en-us/127594 REF https://support.apple.com/en-us/127595 REF https://support.apple.com/en-us/127685 REF https://support.apple.com/en-us/128068 REF https://support.apple.com/en-us/128069 REF https://support.apple.com/en-us/128070 REF https://support.apple.com/en-us/148287

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