------------------------------------------------------------------------ WebKitGTK and WPE WebKit Security Advisory WSA-2026-0005 ------------------------------------------------------------------------

Date reported : August 20, 2026 Advisory ID : WSA-2026-0005 WebKitGTK Advisory URL : https://webkitgtk.org/security/WSA-2026-0005.html WPE WebKit Advisory URL : https://wpewebkit.org/security/WSA-2026-0005.html CVE identifiers : CVE-2026-28984, CVE-2026-43804, CVE-2026-64713, CVE-2026-64719, CVE-2026-64728, CVE-2026-64730, CVE-2026-64757, CVE-2026-64783, CVE-2026-64787.

Several vulnerabilities were discovered in WebKitGTK and WPE WebKit.

CVE-2026-28984 Versions affected: WebKitGTK and WPE WebKit before 2.52.4. Credit to Artem Dinaburg of Trail of Bits via Anthropic CVD. Impact: Processing maliciously crafted web content may lead to an unexpected Safari crash. Description: The issue was addressed with improved memory handling. WebKit Bugzilla: 311883

CVE-2026-43804 Versions affected: WebKitGTK and WPE WebKit before 2.52.6. Credit to Heiko Kiesel of SEEMOO, TU Darmstadt. Impact: Visiting a website may lead to an app denial-of-service. Description: This issue was addressed through improved state management. WebKit Bugzilla: 316816

CVE-2026-64713 Versions affected: WebKitGTK and WPE WebKit before 2.52.6. Credit to Kwak Kiyong, Song Nuri. Impact: Websites may know if the user has visited a given link. Description: This issue was addressed with improved checks. WebKit Bugzilla: 316827

CVE-2026-64719 Versions affected: WebKitGTK and WPE WebKit before 2.52.6. Credit to Shaheen Fazim. Impact: Processing maliciously crafted web content may lead to an unexpected Safari crash. Description: An out-of-bounds access issue was addressed with improved bounds checking. WebKit Bugzilla: 319404

CVE-2026-64728 Versions affected: WebKitGTK and WPE WebKit before 2.52.6. Credit to an anonymous researcher. Impact: Maliciously crafted web content may violate iframe sandboxing policy. Description: A permissions issue was addressed with improved validation. WebKit Bugzilla: 313220

CVE-2026-64730 Versions affected: WebKitGTK and WPE WebKit before 2.52.6. Credit to Kagami Rosylight of Mozilla. Impact: Visiting a website that frames malicious content may lead to UI spoofing. Description: The issue was addressed with improved UI. WebKit Bugzilla: 311660

CVE-2026-64757 Versions affected: WebKitGTK and WPE WebKit before 2.52.6. Credit to Milad Nasr and Nicholas Carlini with Claude, Anthropic. Impact: Processing maliciously crafted web content may lead to an unexpected Safari crash. Description: A memory corruption issue was addressed with improved state management. WebKit Bugzilla: 315082

CVE-2026-64783 Versions affected: WebKitGTK and WPE WebKit before 2.52.6. Credit to 杉山 壮太, lattice, Behzad Najjarpour Jabbari (@G4ru), Junyeong Lee, Mooth.ai, OGINOME Tomohito, Using GLM From Z.AI, Gia Bui (@yabeow) from Calif.io. Impact: Processing maliciously crafted web content may lead to an unexpected Safari crash. Description: A use-after-free issue was addressed with improved memory management. WebKit Bugzilla: 313521

CVE-2026-64787 Versions affected: WebKitGTK and WPE WebKit before 2.52.5. Credit to 杉山 壮太, Shubham Chaskar. Impact: Processing maliciously crafted web content may lead to an unexpected process termination. Description: A use-after-free issue was addressed with improved memory management. WebKit Bugzilla: 313703

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: https://webkitgtk.org/security.html or https://wpewebkit.org/security.

The WebKitGTK and WPE WebKit team,

AirPort. A permissions issue was addressed with additional restrictions.

A correctness issue was addressed with improved checks. This issue is fixed in Safari 26, iOS 18.7 and iPadOS 18.7, iOS 26 and iPadOS 26, macOS Tahoe 26, tvOS 26, visionOS 26, watchOS 26. Processing maliciously crafted web content may lead to an unexpected process crash.

Accessibility. A logic issue was addressed with improved checks.

Accessibility. A logic issue was addressed with improved checks.

A vulnerability was discovered in WebKitGTK's JIT compiler.

An attacker with arbitrary read and write capability may be able to bypass Pointer Authentication. Description: The issue was addressed with improved checks. WebKit Bugzilla: 272750

Versions affected: WebKitGTK and WPE WebKit before 2.44.2.

A malicious website may exfiltrate audio data cross-origin WebKit Bugzilla: 263795

A logic issue was addressed with improved validation. This issue is fixed in tvOS 17.4, macOS Sonoma 14.4, visionOS 1.1, iOS 17.4 and iPadOS 17.4, watchOS 10.4, iOS 16.7.6 and iPadOS 16.7.6, Safari 17.4. Processing maliciously crafted web content may prevent Content Security Policy from being enforced.

A maliciously crafted webpage may be able to fingerprint the user. WebKit Bugzilla: 266703

A logic issue was addressed with improved state management. This issue is fixed in tvOS 17.4, macOS Sonoma 14.4, visionOS 1.1, iOS 17.4 and iPadOS 17.4, watchOS 10.4, iOS 16.7.6 and iPadOS 16.7.6, Safari 17.4. Processing maliciously crafted web content may prevent Content Security Policy from being enforced.

Accessibility. A privacy issue was addressed with improved private data redaction for log entries.

A memory corruption vulnerability was addressed with improved locking. This issue is fixed in iOS 17.1.2 and iPadOS 17.1.2, macOS Sonoma 14.1.2, Safari 17.1.2. Processing web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been exploited against versions of iOS before iOS 16.7.1.

An inconsistent user interface issue was addressed with improved state management. This issue is fixed in iOS 16.7.2 and iPadOS 16.7.2, iOS 17.1 and iPadOS 17.1, Safari 17.1, macOS Sonoma 14.1. Visiting a malicious website may lead to address bar spoofing.

A specially crafted web page can abuse this vulnerability to cause memory corruption and potentially arbitrary code execution. A user would need to visit a malicious webpage to trigger this vulnerability.

Reference: https://webkitgtk.org/security/WSA-2023-0009.html#CVE-2023-39928

Airport. A permissions issue was addressed with improved redaction of sensitive information.

WPE WebKit Advisory URL : https://wpewebkit.org/security/WSA-2022-0007.html CVE identifiers : CVE-2022-32792, CVE-2022-32816, CVE-2022-2294.

Several vulnerabilities were discovered in WebKitGTK and WPE WebKit.

CVE-2022-32792 Versions affected: WebKitGTK and WPE WebKit before 2.36.5. Credit to Manfred Paul (@manfp) working with Trend Micro Zero Day Initiative. Impact: Processing maliciously crafted web content may lead to arbitrary code execution. Description: An out-of-bounds write issue was addressed with improved input validation.

Accessibility. A privacy issue was addressed with improved private data redaction for log entries.

Accessibility. A privacy issue was addressed with improved private data redaction for log entries.

A type confusion issue was addressed with improved checks. This issue is fixed in iOS 16.5.1 and iPadOS 16.5.1, iOS 15.7.7 and iPadOS 15.7.7, macOS Ventura 13.4.1, Safari 16.5.1. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

A use-after-free issue was addressed with improved memory management. This issue is fixed in watchOS 9.5, tvOS 16.5, macOS Ventura 13.4, iOS 15.7.6 and iPadOS 15.7.6, Safari 16.5, iOS 16.5 and iPadOS 16.5. Processing maliciously crafted web content may lead to arbitrary code execution. Apple is aware of a report that this issue may have been actively exploited.

Accessibility. A privacy issue was addressed with improved private data redaction for log entries.

A flaw was found in the WebKitGTK package. An improper input validation issue may lead to a use-after-free vulnerability. This flaw allows attackers with network access to pass specially crafted web content files, causing a denial of service or arbitrary code execution. This CVE exists because of a CVE-2023-28205 security regression for the WebKitGTK package in Red Hat Enterprise Linux 8.8 and Red Hat Enterprise Linux 9.2.

A logic issue was addressed with improved validation. This issue is fixed in macOS Ventura 13.3. Content Security Policy to block domains with wildcards may fail.

A use-after-free issue was addressed with improved memory management. This issue is fixed in iOS 16.4 and iPadOS 16.4, macOS Ventura 13.3. Processing web content may lead to arbitrary code execution.

A use-after-free vulnerability in WebCore::RenderLayer::addChild in WebKitGTK before 2.36.8 allows attackers to execute code remotely.

A use-after-free vulnerability in WebCore::RenderLayer::renderer in WebKitGTK before 2.36.8 allows attackers to execute code remotely.

A use-after-free vulnerability in WebCore::RenderLayer::updateDescendantDependentFlags in WebKitGTK before 2.36.8 allows attackers to execute code remotely.

A use-after-free vulnerability in WebCore::RenderLayer::repaintBlockSelectionGaps in WebKitGTK before 2.36.8 allows attackers to execute code remotely.

A use-after-free vulnerability in WebCore::RenderLayer::setNextSibling in WebKitGTK before 2.36.8 allows attackers to execute code remotely.