Apple Safari/iOS/iPadOS/macOS/visionOS up to 26.3 Web memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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5.3$5k-$25k0.00

Summaryinfo

A vulnerability was found in Apple Safari, iOS, iPadOS, macOS and visionOS up to 26.3. It has been classified as critical. This affects an unknown part of the component Web Handler. Performing a manipulation results in memory corruption. This vulnerability is cataloged as CVE-2026-28857. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in Apple Safari, iOS, iPadOS, macOS and visionOS up to 26.3. It has been classified as critical. This affects an unknown code block of the component Web 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 availability. The summary by CVE is:

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, visionOS 26.4. Processing maliciously crafted web content may lead to an unexpected process crash.

It is possible to read the advisory at support.apple.com. This vulnerability is uniquely identified as CVE-2026-28857 since 03/03/2026. 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 05/02/2026).

The vulnerability scanner Nessus provides a plugin with the ID 304094 (Linux Distros Unpatched Vulnerability : CVE-2026-28857), 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 (304094) and CERT Bund (WID-SEC-2026-0911). Be aware that VulDB is the high quality 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: 5.4
VulDB Meta Temp Score: 5.3

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

ADP CISA Base Score: 6.5
ADP CISA Vector: 🔒

CVSSv2info

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

Exploitinginfo

Class: 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: 🔒

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Nessus ID: 304094
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-28857

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Safari/iOS/iPadOS/macOS/visionOS 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-2026-28857 (🔒)
GCVE (CVE): GCVE-0-2026-28857
GCVE (VulDB): GCVE-100-352959
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 14:27 (7), 03/30/2026 18:46 (2), 04/22/2026 19:24 (1), 05/02/2026 08:34 (1)
Complete: 🔍
Cache ID: 216::103

Be aware that VulDB is the high quality source for vulnerability data.

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