VDB-336969 · CVE-2025-43535 · Nessus 279093

WebKitGTK/WPE WebKit up to 2.50.3 Web memory corruption

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.0	$0-$5k	0.00

Summaryinfo

A vulnerability has been found in WebKitGTK and WPE WebKit up to 2.50.3 and classified as critical. The affected element is an unknown function of the component Web Handler. Performing a manipulation results in memory corruption. This vulnerability is cataloged as CVE-2025-43535. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in WebKitGTK and WPE WebKit up to 2.50.3. This affects an unknown part 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 confidentiality, integrity, and availability. The summary by CVE is:

The issue was addressed with improved memory handling. This issue is fixed in Safari 26.2, iOS 18.7.3 and iPadOS 18.7.3, iOS 26.2 and iPadOS 26.2, macOS Tahoe 26.2, visionOS 26.2. Processing maliciously crafted web content may lead to an unexpected process crash.

The weakness was shared by Nan Wang. The advisory is shared at seclists.org. This vulnerability is uniquely identified as CVE-2025-43535. 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. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 279093 (Debian dsa-6083 : gir1.2-javascriptcoregtk-4.0 - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.50.4 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (279093) and CERT Bund (WID-SEC-2025-2891). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

Amazon Linux 2
Red Hat Enterprise Linux
Ubuntu Linux
SUSE Linux
Oracle Linux
SUSE openSUSE
RESF Rocky Linux
Open Source WebKitGTK

Productinfo

Type

Web Browser

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.3
VulDB Meta Temp Score: 6.0

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

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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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-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 279093
Nessus Name: Debian dsa-6083 : gir1.2-javascriptcoregtk-4.0 - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: WebKitGTK/WPE WebKit 2.50.4

Timelineinfo

12/17/2025 Advisory disclosed
12/17/2025 +0 days VulDB entry created
01/24/2026 +38 days VulDB entry last update

Sourcesinfo

Advisory: seclists.org
Researcher: Nan Wang
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2025-43535 (🔒)
GCVE (CVE): GCVE-0-2025-43535
GCVE (VulDB): GCVE-100-336969
CERT Bund: WID-SEC-2025-2891 - WebKitGTK: Mehrere Schwachstellen ermöglichen Codeausführung und DoS

Entryinfo

Created: 12/17/2025 09:39
Updated: 01/24/2026 09:06
Changes: 12/17/2025 09:39 (54), 12/19/2025 02:50 (2), 12/20/2025 00:02 (7), 12/20/2025 09:01 (1), 01/04/2026 06:35 (1), 01/24/2026 09:06 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.