Apple iOS/iPadOS/macOS/tvOS/visionOS/watchOS up to 26.4 Web denial of service

CVSS Meta Temp Score
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CTI Interest Score
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5.8$5k-$25k0.00

Summaryinfo

A vulnerability was found in Apple iOS, iPadOS, macOS, tvOS, visionOS and watchOS up to 26.4. It has been rated as problematic. This affects an unknown part of the component Web Handler. Performing a manipulation results in denial of service. This vulnerability is cataloged as CVE-2026-43658. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in Apple iOS, iPadOS, macOS, tvOS, visionOS and watchOS up to 26.4. It has been classified as problematic. This affects an unknown function of the component Web Handler. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability. The summary by CVE is:

The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5, 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 Safari crash.

It is possible to read the advisory at support.apple.com. This vulnerability is uniquely identified as CVE-2026-43658 since 05/02/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 07/02/2026). The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 318337 (Linux Distros Unpatched Vulnerability : CVE-2026-43658), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 26.5 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (318337) and CERT Bund (WID-SEC-2026-1543). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Apple Safari

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 7.5
ADP CISA Vector: 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 318337
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-43658

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: iOS/iPadOS/macOS/tvOS/visionOS/watchOS 26.5

Timelineinfo

05/02/2026 CVE reserved
05/12/2026 +10 days Advisory disclosed
05/12/2026 +0 days VulDB entry created
07/02/2026 +51 days VulDB entry last update

Sourcesinfo

Vendor: apple.com

Advisory: support.apple.com
Status: Confirmed

CVE: CVE-2026-43658 (🔒)
GCVE (CVE): GCVE-0-2026-43658
GCVE (VulDB): GCVE-100-362859
CERT Bund: WID-SEC-2026-1543 - Apple Safari: Mehrere Schwachstellen

scip Labs: https://www.scip.ch/en/?labs.20180712

Entryinfo

Created: 05/12/2026 04:22
Updated: 07/02/2026 22:59
Changes: 05/12/2026 04:22 (57), 05/16/2026 13:22 (7), 06/03/2026 14:48 (2), 07/02/2026 22:59 (12)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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