WebKitGTK and WPE WebKit Security Advisory WSA-2025-0009

• Date Reported: December 04, 2025

• Advisory ID: WSA-2025-0009

• CVE identifiers: CVE-2025-13502, CVE-2025-13947, CVE-2025-43421, CVE-2025-43458, CVE-2025-66287

Several vulnerabilities were discovered in WebKitGTK and WPE WebKit.

• CVE-2025-13502
  • Versions affected: WebKitGTK and WPE WebKit before 2.50.2.
  • Credit to Stanislav Fort, Aisle Research.
  • Impact: Processing maliciously crafted web content may lead to an unexpected process crash. Description: A buffer overflow was addressed with improved bounds checking.
  • WebKit Bugzilla: 302218
• CVE-2025-13947
  • Versions affected: WebKitGTK and WPE WebKit before 2.50.3.
  • Credit to Janet Black.
  • Impact: A website may be able to exfiltrate sensitive system information. Description: The issue was addressed through improved state checks.
  • WebKit Bugzilla: 271957
• CVE-2025-43421
  • Versions affected: WebKitGTK and WPE WebKit before 2.50.3.
  • Credit to Nan Wang (@eternalsakura13).
  • Impact: Processing maliciously crafted web content may lead to an unexpected process crash. Description: Multiple issues were addressed by disabling array allocation sinking.
  • WebKit Bugzilla: 300718
• CVE-2025-43458
  • Versions affected: WebKitGTK and WPE WebKit before 2.50.3.
  • Credit to Phil Beauvoir.
  • Impact: Processing maliciously crafted web content may lead to an unexpected process crash. Description: This issue was addressed through improved state management.
  • WebKit Bugzilla: 296693
• CVE-2025-66287
  • Versions affected: WebKitGTK and WPE WebKit before 2.50.3.
  • Credit to Stanislav Fort, Aisle Research.
  • Impact: Processing maliciously crafted web content may lead to an unexpected process crash. Description: The issue was addressed with improved memory handling.
  • WebKit Bugzilla: 302220

We recommend updating to the latest stable versions of WebKitGTK and WPE WebKit. It is the best way to ensure that you are running safe versions of WebKit. Please check our websites for information about the latest stable releases.

Further information about WebKitGTK and WPE WebKit security advisories can be found at: webkitgtk.org/security.html or wpewebkit.org/security.