Apple Safari/iOS/iPadOS/macOS/tvOS/visionOS/watchOS up to 26.3 Website memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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5.2$25k-$100k0.00

Summaryinfo

A vulnerability, which was classified as critical, was found in Apple Safari, iOS, iPadOS, macOS, tvOS, visionOS and watchOS up to 26.3. Affected is an unknown function of the component Website Handler. The manipulation results in memory corruption. This vulnerability is identified as CVE-2026-28859. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Apple Safari, iOS, iPadOS, macOS, tvOS, visionOS and watchOS up to 26.3. Affected is some unknown functionality of the component Website Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. CWE is classifying the issue as CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The issue was addressed with improved memory handling. This issue is fixed in Safari 26.4, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, tvOS 26.4, visionOS 26.4, watchOS 26.4. A malicious website may be able to process restricted web content outside the sandbox.

The advisory is shared for download at support.apple.com. This vulnerability is traded as CVE-2026-28859 since 03/03/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $25k-$100k (estimation calculated on 05/02/2026).

The vulnerability scanner Nessus provides a plugin with the ID 304104 (Linux Distros Unpatched Vulnerability : CVE-2026-28859), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 26.4 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (304104) and CERT Bund (WID-SEC-2026-0911). Once again VulDB remains the best source for vulnerability data.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • SUSE Linux
  • Oracle Linux
  • RESF Rocky Linux
  • Open Source WebKitGTK

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.3
VulDB Meta Temp Score: 5.2

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 4.3
ADP CISA Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 304104
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-28859

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Safari/iOS/iPadOS/macOS/tvOS/visionOS/watchOS 26.4

Timelineinfo

03/03/2026 CVE reserved
03/25/2026 +22 days Advisory disclosed
03/25/2026 +0 days VulDB entry created
05/02/2026 +38 days VulDB entry last update

Sourcesinfo

Vendor: apple.com

Advisory: support.apple.com
Status: Confirmed

CVE: CVE-2026-28859 (🔒)
GCVE (CVE): GCVE-0-2026-28859
GCVE (VulDB): GCVE-100-352956
CERT Bund: WID-SEC-2026-0911 - WebKitGTK: Mehrere Schwachstellen

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

Entryinfo

Created: 03/25/2026 07:52
Updated: 05/02/2026 08:34
Changes: 03/25/2026 07:52 (57), 03/29/2026 20:44 (12), 03/30/2026 06:08 (2), 03/30/2026 14:27 (7), 04/22/2026 19:24 (1), 05/02/2026 08:34 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

Discussion

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