Protection mechanism failure in Apple Safari
Priority LOW 36CWE-693Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Low · None · Low
- Fix status
- Partial Red Hat: 15 fixed, 1 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-693.
Summary
This issue was addressed through improved state management. This issue is fixed in Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, tvOS 26.4, visionOS 26.4, watchOS 26.4. Processing maliciously crafted web content may prevent Content Security Policy from being enforced.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00634 50th percentileScored 2026-11-07
Fix Partial Safari (Apple): 26.4iOS and iPadOS (Apple): 18.7.7, 26.4+4 more productsRed Hat: 11 advisoriesRed Hat: 15 fixed, 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Apple | Safari | before 26.4 | 26.4 | Patch available | CNA |
| Apple | iOS and iPadOS | before 18.7.7; before 26.4 | 18.7.7, 26.4 | Patch available | CNA |
| Apple | macOS | before 26.4 | 26.4 | Patch available | CNA |
| Apple | tvOS | before 26.4 | 26.4 | Patch available | CNA |
| Apple | visionOS | before 26.4 | 26.4 | Patch available | CNA |
| Apple | watchOS | before 26.4 | 26.4 | Patch available | CNA |
- Safari VendorApple Affected before 26.4 Fixed in 26.4 Patch available CNA
- iOS and iPadOS VendorApple Affected before 18.7.7; before 26.4 Fixed in 18.7.7, 26.4 Patch available CNA
- macOS VendorApple Affected before 26.4 Fixed in 26.4 Patch available CNA
- tvOS VendorApple Affected before 26.4 Fixed in 26.4 Patch available CNA
- visionOS VendorApple Affected before 26.4 Fixed in 26.4 Patch available CNA
- watchOS VendorApple Affected before 26.4 Fixed in 26.4 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:* | before 26.4 | Vulnerable | Apple |
| cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* | before 18.7.7; 26.0 to before 26.4 | Vulnerable | Apple |
| cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* | before 18.7.7; 26.0 to before 26.4 | Vulnerable | Apple |
| cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* | before 26.4 | Vulnerable | Apple |
| cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* | before 26.4 | Vulnerable | Apple |
| cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:* | before 26.4 | Vulnerable | Apple |
| cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* | before 26.4 | Vulnerable | Apple |
- cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:* Versions before 26.4 Vulnerable ·Apple
- cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* Versions before 18.7.7; 26.0 to before 26.4 Vulnerable ·Apple
- cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* Versions before 18.7.7; 26.0 to before 26.4 Vulnerable ·Apple
- cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions before 26.4 Vulnerable ·Apple
- cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* Versions before 26.4 Vulnerable ·Apple
- cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:* Versions before 26.4 Vulnerable ·Apple
- cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* Versions before 26.4 Vulnerable ·Apple
Remediation
- Fix · CNA Safari (Apple) Fixed in 26.4
- Fix · CNA iOS and iPadOS (Apple) Fixed in 18.7.7, 26.4
- Fix · CNA macOS (Apple) Fixed in 26.4
- Fix · CNA tvOS (Apple) Fixed in 26.4
- Fix · CNA visionOS (Apple) Fixed in 26.4
- Fix · CNA watchOS (Apple) Fixed in 26.4
Red Hat 11 advisories
- RHSA-2026:22136 Released 2026-06-01 · Red Hat rating Importantwebkitgtk4 security update
- Red Hat Enterprise Linux Server (v. 7 ELS) webkitgtk4-2.52.3-1.el7_9, webkitgtk4-devel-2.52.3-1.el7_9, webkitgtk4-jsc-2.52.3-1.el7_9 +1
- Red Hat Enterprise Linux Server Optional (v. 7 ELS) webkitgtk4-devel-2.52.3-1.el7_9, webkitgtk4-doc-2.52.3-1.el7_9, webkitgtk4-jsc-devel-2.52.3-1.el7_9
- RHSA-2026:19535 Released 2026-05-20 · Red Hat rating Importantwebkit2gtk3 security update
- Red Hat Enterprise Linux AppStream E4S (v.9.0) webkit2gtk3-2.52.3-1.el9_0, webkit2gtk3-devel-2.52.3-1.el9_0, webkit2gtk3-jsc-2.52.3-1.el9_0 +1
- RHSA-2026:19206 Released 2026-05-19 · Red Hat rating Importantwebkit2gtk3 security update
- Red Hat Enterprise Linux AppStream (v. 9) webkit2gtk3-2.52.3-1.el9_8, webkit2gtk3-devel-2.52.3-1.el9_8, webkit2gtk3-jsc-2.52.3-1.el9_8 +1
Show 8 more Red Hat advisories
- RHSA-2026:16695 Released 2026-05-13 · Red Hat rating Importantwebkit2gtk3 security update
- Red Hat Enterprise Linux AppStream E4S (v.9.2) webkit2gtk3-2.52.3-1.el9_2, webkit2gtk3-devel-2.52.3-1.el9_2, webkit2gtk3-jsc-2.52.3-1.el9_2 +1
- RHSA-2026:16056 Released 2026-05-11 · Red Hat rating Importantwebkit2gtk3 security update
- Red Hat Enterprise Linux AppStream AUS (v.8.4) webkit2gtk3-2.52.3-1.el8_4, webkit2gtk3-devel-2.52.3-1.el8_4, webkit2gtk3-jsc-2.52.3-1.el8_4 +1
- Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) webkit2gtk3-2.52.3-1.el8_4, webkit2gtk3-devel-2.52.3-1.el8_4, webkit2gtk3-jsc-2.52.3-1.el8_4 +1
- RHSA-2026:14659 Released 2026-05-07 · Red Hat rating Importantwebkit2gtk3 security update
- Red Hat Enterprise Linux AppStream EUS (v.9.4) webkit2gtk3-2.52.3-1.el9_4, webkit2gtk3-devel-2.52.3-1.el9_4, webkit2gtk3-jsc-2.52.3-1.el9_4 +1
- RHSA-2026:13845 Released 2026-05-05 · Red Hat rating Importantwebkit2gtk3 security update
- Red Hat Enterprise Linux AppStream AUS (v.8.6) webkit2gtk3-2.52.3-1.el8_6, webkit2gtk3-devel-2.52.3-1.el8_6, webkit2gtk3-jsc-2.52.3-1.el8_6 +1
- Red Hat Enterprise Linux AppStream E4S (v.8.6) webkit2gtk3-2.52.3-1.el8_6, webkit2gtk3-devel-2.52.3-1.el8_6, webkit2gtk3-jsc-2.52.3-1.el8_6 +1
- Red Hat Enterprise Linux AppStream TUS (v.8.6) webkit2gtk3-2.52.3-1.el8_6, webkit2gtk3-devel-2.52.3-1.el8_6, webkit2gtk3-jsc-2.52.3-1.el8_6 +1
- RHSA-2026:11814 Released 2026-04-29 · Red Hat rating Importantwebkit2gtk3 security update
- Red Hat Enterprise Linux AppStream E4S (v.8.8) webkit2gtk3-2.52.3-1.el8_8, webkit2gtk3-devel-2.52.3-1.el8_8, webkit2gtk3-jsc-2.52.3-1.el8_8 +1
- Red Hat Enterprise Linux AppStream TUS (v.8.8) webkit2gtk3-2.52.3-1.el8_8, webkit2gtk3-devel-2.52.3-1.el8_8, webkit2gtk3-jsc-2.52.3-1.el8_8 +1
- RHSA-2026:11329 Released 2026-04-28 · Red Hat rating Importantwebkit2gtk3 security update
- Red Hat Enterprise Linux AppStream EUS (v.9.6) webkit2gtk3-2.52.3-1.el9_6, webkit2gtk3-devel-2.52.3-1.el9_6, webkit2gtk3-jsc-2.52.3-1.el9_6 +1
- RHSA-2026:10702 Released 2026-04-27 · Red Hat rating Importantwebkit2gtk3 security update
- Red Hat Enterprise Linux AppStream (v. 8) webkit2gtk3-2.52.3-1.el8_10, webkit2gtk3-devel-2.52.3-1.el8_10, webkit2gtk3-jsc-2.52.3-1.el8_10 +1
- RHSA-2026:9692 Released 2026-04-22 · Red Hat rating Importantwebkit2gtk3 security update
- Red Hat Enterprise Linux AppStream (v. 9) webkit2gtk3-2.52.3-0.el9_7.1, webkit2gtk3-devel-2.52.3-0.el9_7.1, webkit2gtk3-jsc-2.52.3-0.el9_7.1 +1
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Apple visionOS 26.4
27 records Highest priority Priority MEDIUM 1 MEDIUM, 26 LOW
Other records, highest priority first
- TI-2026-16744 Path traversal in Apple iOS and iPadOSPriority MEDIUM 42
- TI-2026-23066 Information disclosure in Apple iOS and iPadOSPriority LOW 37
- TI-2026-23068 Improper access control in Apple iOS and iPadOSPriority LOW 36
- Release ·
Apple macOS 26.4
23 records Highest priority Priority MEDIUM 1 MEDIUM, 22 LOW
Other records, highest priority first
- TI-2026-16688 Apple macOS: A user may be able to elevate privilegesPriority MEDIUM 40
- TI-2026-23036 Heap-based buffer overflow in Apple macOSPriority LOW 39
- TI-2026-23031 Improper access control in Apple macOSPriority LOW 39
Show 4 more groups
- Release ·
Apple watchOS 26.4
20 records Highest priority Priority LOW 20 LOW
Other records, highest priority first
- TI-2026-23066 Information disclosure in Apple iOS and iPadOSPriority LOW 37
- TI-2026-23054 Improper authorization in Apple iOS and iPadOSPriority LOW 34
- TI-2026-16753 Memory corruption in Apple iOS and iPadOSPriority LOW 34
- Release ·
Apple iOS and iPadOS 18.7.7, 26.4
16 records Highest priority Priority LOW 16 LOW
Other records, highest priority first
- TI-2026-23066 Information disclosure in Apple iOS and iPadOSPriority LOW 37
- TI-2026-23068 Improper access control in Apple iOS and iPadOSPriority LOW 36
- TI-2026-23054 Improper authorization in Apple iOS and iPadOSPriority LOW 34
- Release ·
Apple tvOS 26.4
15 records Highest priority Priority LOW 15 LOW
Other records, highest priority first
- TI-2026-23066 Information disclosure in Apple iOS and iPadOSPriority LOW 37
- TI-2026-23054 Improper authorization in Apple iOS and iPadOSPriority LOW 34
- TI-2026-16753 Memory corruption in Apple iOS and iPadOSPriority LOW 34
- Release ·
Apple Safari 26.4
7 records Highest priority Priority LOW 7 LOW
Other records, highest priority first
- TI-2026-23046 Out-of-bounds read in Apple SafariPriority LOW 30
- TI-2026-23048 Out-of-bounds read in Apple SafariPriority LOW 21
- TI-2026-16720 Out-of-bounds write in Apple SafariPriority LOW 21
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2026:10702 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:19206, RHSA-2026:9692 |
| Red Hat Enterprise Linux AppStream AUS (v.8.4) | Fixed | RHSA-2026:16056 |
| Red Hat Enterprise Linux AppStream AUS (v.8.6) | Fixed | RHSA-2026:13845 |
| Red Hat Enterprise Linux AppStream E4S (v.8.6) | Fixed | RHSA-2026:13845 |
| Red Hat Enterprise Linux AppStream E4S (v.8.8) | Fixed | RHSA-2026:11814 |
| Red Hat Enterprise Linux AppStream E4S (v.9.0) | Fixed | RHSA-2026:19535 |
| Red Hat Enterprise Linux AppStream E4S (v.9.2) | Fixed | RHSA-2026:16695 |
| Red Hat Enterprise Linux AppStream EUS (v.9.4) | Fixed | RHSA-2026:14659 |
| Red Hat Enterprise Linux AppStream EUS (v.9.6) | Fixed | RHSA-2026:11329 |
| Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) | Fixed | RHSA-2026:16056 |
| Red Hat Enterprise Linux AppStream TUS (v.8.6) | Fixed | RHSA-2026:13845 |
| Red Hat Enterprise Linux AppStream TUS (v.8.8) | Fixed | RHSA-2026:11814 |
| Red Hat Enterprise Linux Server (v. 7 ELS) | Fixed | RHSA-2026:22136 |
| Red Hat Enterprise Linux Server Optional (v. 7 ELS) | Fixed | RHSA-2026:22136 |
Not affected: 1 product
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-20665
- 2026-10-03 Alias added: GHSA-w9qh-3c3h-mc7x
- 2026-10-25 EPSS moved to the 50th–90th percentile
References
More Apple Ipados vulnerabilities
- TI-2025-28008 Out-of-bounds write in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 10.0
- TI-2025-22441 Apple iOS and iPadOS: An attacker with arbitrary read and write capability may be able to… KEVCVSS 3.1CRITICAL 9.8
- TI-2025-22440 Memory corruption in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 9.8
- TI-2025-17951 Out-of-bounds write in Apple Safari KEVCVSS 3.1CRITICAL 10.0
- TI-2025-17847 Use after free in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 10.0
- TI-2022-06854 Out-of-bounds write in Apple iOS and iPadOS KEVCVSS 3.1CRITICAL 9.8
Sources
- CVE-2026-20665 · CVE Program
- CVE-2026-20665 · NVD
- FIRST EPSS
- GHSA-w9qh-3c3h-mc7x · GitHub Advisory Database · CC BY 4.0
- CVE-2026-20665 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences