SB20260513113 - Debian update for webkit2gtk
Published: May 13, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 9 vulnerabilities.
1) Improper Initialization (CVE-ID: CVE-2025-46299)
The vulnerability allows a remote attacker to gain access to sensitive information.
The vulnerability exists due to improper initialization in WebKit. A remote attacker can trick the victim into visiting a specially crafted website and disclose internal states of the app.
2) Protection mechanism failure (CVE-ID: CVE-2026-20643)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to insufficient implementation of security measures within the Navigation API in WebKit. A remote attacker can trick the victim into visiting a specially crafted website and bypass Same Origin Policy.
3) Memory corruption (CVE-ID: CVE-2026-20664)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected process crash.
4) State Issues (CVE-ID: CVE-2026-20665)
The vulnerability allows a remote attacker to bypass implemented security restrictions.
The vulnerability exists due to a state management issue in WebKit. A remote attacker can trick the victim into visiting a specially crafted website and prevent Content Security Policy from being enforced.
5) Information disclosure (CVE-ID: CVE-2026-20691)
The vulnerability allows a remote attacker to gain access to potentially sensitive information.
The vulnerability exists due to excessive data output by the WebKit Sandboxing component. A remote attacker can gain fingerprint the user.
6) Memory corruption (CVE-ID: CVE-2026-28857)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary error in WebKit. A remote attacker can trick the victim into opening a specially crafted file and perform an unexpected process crash.
7) Memory corruption (CVE-ID: CVE-2026-28859)
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to improper input validation in WebKit when processing web content. A remote attacker can trick the victim into visiting a specially crafted website and force the browser into processing restricted web content outside the sandbox.
8) State Issues (CVE-ID: CVE-2026-28861)
The vulnerability allows a remote attacker to disclose sensitive information.
The vulnerability exists due to improper handling of web content in WebKit when processing malicious web pages. A remote attacker can entice the victim to visit a specially crafted website and access script message handlers intended for other origins.
9) Universal cross-site scripting (CVE-ID: CVE-2026-28871)
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in WebKit. A remote attacker can trick the victim to follow a specially crafted link and execute arbitrary HTML and script code in user's browser in context of an arbitrary website.
Remediation
Install update from vendor's website.