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Watchos CVE-2026-20635

MEDIUM
Buffer Overflow (CWE-119)
2026-02-11 product-security@apple.com
Buffer Overflow Apple Ipados Iphone Os Tvos Visionos Watchos
4.3
CVSS 3.1 · Vendor: apple
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Vulnerability Assessment

Weakness
CWE
CWE-119
OWASP Top 10:2025
A06:2021 - Vulnerable and Outdated Components
ASVS 5.0
V15 - Secure Coding and Architecture Bounds checking, buffer size validation
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.

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Impact

CVSS 4.3 (MEDIUM). Attack vector: Network. Complexity: Low. Privileges required: None. User interaction: Required.
Exploit ScenarioDerived

An attacker could exploit this vulnerability to an unexpected process crash.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

Denial of service affecting Apple's macOS, iOS, iPadOS, watchOS, tvOS, and visionOS results from a memory handling flaw that crashes processes when parsing malicious web content. An unauthenticated remote attacker can trigger unexpected application termination through crafted web pages, requiring only user interaction to visit a malicious site. A patch is not currently available for this medium-severity vulnerability.

Earlier versions of this analysis (1)
v1 Mar 12, 2026 - 22:02 CVSS 4.3

The issue was addressed with improved memory handling. This issue is fixed in watchOS 26.3, tvOS 26.3, macOS Tahoe 26.3, iOS 18.7.5 and iPadOS 18.7.5, visionOS 26.3, iOS 26.3 and iPadOS 26.3, Safari 26.3. [CVSS 4.3 MEDIUM]

RemediationAI

Monitor vendor advisories for a patch. Enable ASLR, DEP/NX, and stack canaries where possible. Restrict network access to the affected service where possible.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

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Technical ContextAI · show details

Classified as CWE-119 (Buffer Overflow). Affects Safari. The issue was addressed with improved memory handling. This issue is fixed in watchOS 26.3, tvOS 26.3, macOS Tahoe 26.3, iOS 18.7.5 and iPadOS 18.7.5, visionOS 26.3, iOS 26.3 and iPadOS 26.3, Safari 26.3. Processing maliciously crafted web content may lead to an unexpected process crash.

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (apple) PRIMARY 4.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
SUSE MEDIUM
Red Hat 8.8 HIGH

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
Low

Lifecycle Timeline

2
Patch released
Apr 09, 2026 - 14:30 nvd
Patch available
CVE Published
Feb 11, 2026 - 23:16 nvd
MEDIUM 4.3

DescriptionCVE.org

The issue was addressed with improved memory handling. This issue is fixed in watchOS 26.3, tvOS 26.3, macOS Tahoe 26.3, iOS 18.7.5 and iPadOS 18.7.5, visionOS 26.3, iOS 26.3 and iPadOS 26.3, Safari 26.3. Processing maliciously crafted web content may lead to an unexpected process crash.

Executive ViewAI

Why It Matters

Organizations using The should be aware of moderate risk from CVE-2026-20635, a buffer overflow vulnerability rated CVSS 4.3. Exploitation could cause memory corruption or application crashes. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Low
Compensating Controls

Apply vendor patch. If patching is delayed: restrict network access and enable monitoring.

Threat Intelligence Overview

EPSS Score
0.0%
Top 86% exploitable
Data Quality
5 sources
Confidence: Medium
NVD CVE.org EPSS Vendor 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 0.0%
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
Defer
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
No
Human Impact
Low

Priority Score

22
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +22
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Affected Products (CPE)CVE.org

cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:*
cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*

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Same weakness CWE-119 – Buffer Overflow

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CVE-2013-3918 HIGH POC
8.8
CVE-2023-4966 HIGH POC
7.5
CVE-2017-11774 HIGH POC
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CVE-2013-3660 HIGH POC
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Same technique Buffer Overflow

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CVE-2009-0927 HIGH POC
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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS Fixed
SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS Fixed
SUSE Linux Enterprise Server 12 SP5-LTSS Fixed

References

Advisories & patches
ADVISORY https://support.apple.com/en-us/126346 ADVISORY https://support.apple.com/en-us/126347 ADVISORY https://support.apple.com/en-us/126348 ADVISORY https://support.apple.com/en-us/126351 ADVISORY https://support.apple.com/en-us/126352 ADVISORY https://support.apple.com/en-us/126353 ADVISORY https://support.apple.com/en-us/126354 ADVISORY https://vuldb.com/?id.345691 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1139/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1150/ REF https://access.redhat.com/errata/RHSA-2026:10702 REF https://access.redhat.com/errata/RHSA-2026:11329 REF https://access.redhat.com/errata/RHSA-2026:11814 REF https://access.redhat.com/errata/RHSA-2026:13845 REF https://access.redhat.com/errata/RHSA-2026:14659 REF https://access.redhat.com/errata/RHSA-2026:16056 REF https://access.redhat.com/errata/RHSA-2026:16695 REF https://access.redhat.com/errata/RHSA-2026:19206 REF https://access.redhat.com/errata/RHSA-2026:19535 REF https://access.redhat.com/errata/RHSA-2026:22136 REF https://access.redhat.com/errata/RHSA-2026:9692 REF https://access.redhat.com/security/cve/CVE-2026-20635 REF https://bugzilla.redhat.com/show_bug.cgi?id=2448790 REF https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-20635.json

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