Memory corruption in Apple Safari
Priority LOW 20CWE-119Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · 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.
Summary
The issue was addressed with improved memory handling. This issue is fixed in Safari 26.3, iOS 18.7.5 and iPadOS 18.7.5, iOS 26.3 and iPadOS 26.3, macOS Tahoe 26.3, tvOS 26.3, visionOS 26.3, watchOS 26.3. Processing maliciously crafted web content may lead to an unexpected process crash.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00362 30th percentileScored 2026-11-07
Fix Partial Safari (Apple): 26.3iOS and iPadOS (Apple): 18.7.5, 26.3+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
- No
- 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 26.3 | 26.3 | Patch available | CNA |
| Apple | iOS and iPadOS | before 18.7.5; before 26.3 | 18.7.5, 26.3 | Patch available | CNA |
| Apple | macOS | before 26.3 | 26.3 | Patch available | CNA |
| Apple | tvOS | before 26.3 | 26.3 | Patch available | CNA |
| Apple | visionOS | before 26.3 | 26.3 | Patch available | CNA |
| Apple | watchOS | before 26.3 | 26.3 | Patch available | CNA |
- Safari VendorApple Affected before 26.3 Fixed in 26.3 Patch available CNA
- iOS and iPadOS VendorApple Affected before 18.7.5; before 26.3 Fixed in 18.7.5, 26.3 Patch available CNA
- macOS VendorApple Affected before 26.3 Fixed in 26.3 Patch available CNA
- tvOS VendorApple Affected before 26.3 Fixed in 26.3 Patch available CNA
- visionOS VendorApple Affected before 26.3 Fixed in 26.3 Patch available CNA
- watchOS VendorApple Affected before 26.3 Fixed in 26.3 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:* | before 26.3 | Vulnerable | Apple |
| cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* | before 18.7.5; 26.0 to before 26.3 | Vulnerable | Apple |
| cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* | before 18.7.5; 26.0 to before 26.3 | Vulnerable | Apple |
| cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* | before 26.3 | Vulnerable | Apple |
| cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* | before 26.3 | Vulnerable | Apple |
| cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:* | before 26.3 | Vulnerable | Apple |
| cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* | before 26.3 | Vulnerable | Apple |
- cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:* Versions before 26.3 Vulnerable ·Apple
- cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* Versions before 18.7.5; 26.0 to before 26.3 Vulnerable ·Apple
- cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* Versions before 18.7.5; 26.0 to before 26.3 Vulnerable ·Apple
- cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions before 26.3 Vulnerable ·Apple
- cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:* Versions before 26.3 Vulnerable ·Apple
- cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:* Versions before 26.3 Vulnerable ·Apple
- cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:* Versions before 26.3 Vulnerable ·Apple
Remediation
- Fix · CNA Safari (Apple) Fixed in 26.3
- Fix · CNA iOS and iPadOS (Apple) Fixed in 18.7.5, 26.3
- Fix · CNA macOS (Apple) Fixed in 26.3
- Fix · CNA tvOS (Apple) Fixed in 26.3
- Fix · CNA visionOS (Apple) Fixed in 26.3
- Fix · CNA watchOS (Apple) Fixed in 26.3
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 26.3
26 records Highest priority Priority CRITICAL 1 CRITICAL, 4 MEDIUM, 21 LOW
Other records, highest priority first
- TI-2026-16755 Memory corruption in Apple iOS and iPadOSPriority CRITICAL 93
- TI-2026-16733 Time-of-check time-of-use race condition in Apple iOS and iPadOSPriority MEDIUM 41
- TI-2026-16673 Out-of-bounds write in Apple iOS and iPadOSPriority MEDIUM 41
- Release ·
Apple iOS and iPadOS 18.7.5, 26.3
23 records Highest priority Priority MEDIUM 2 MEDIUM, 21 LOW
Other records, highest priority first
- TI-2026-16733 Time-of-check time-of-use race condition in Apple iOS and iPadOSPriority MEDIUM 41
- TI-2026-16709 Uncontrolled resource consumption in Apple SafariPriority MEDIUM 40
- TI-2026-16731 Out-of-bounds read in Apple iOS and iPadOSPriority LOW 36
Show 4 more groups
- Release ·
Apple macOS 26.3
21 records Highest priority Priority CRITICAL 1 CRITICAL, 2 MEDIUM, 18 LOW
Other records, highest priority first
- TI-2026-16755 Memory corruption in Apple iOS and iPadOSPriority CRITICAL 93
- TI-2026-16709 Uncontrolled resource consumption in Apple SafariPriority MEDIUM 40
- TI-2026-16707 Uncontrolled resource consumption in Apple iOS and iPadOSPriority MEDIUM 40
- Release ·
Apple watchOS 26.3
15 records Highest priority Priority CRITICAL 1 CRITICAL, 1 MEDIUM, 13 LOW
Other records, highest priority first
- TI-2026-16755 Memory corruption in Apple iOS and iPadOSPriority CRITICAL 93
- TI-2026-16707 Uncontrolled resource consumption in Apple iOS and iPadOSPriority MEDIUM 40
- TI-2026-16723 Protection mechanism failure in Apple iOS and iPadOSPriority LOW 39
- Release ·
Apple tvOS 26.3
13 records Highest priority Priority CRITICAL 1 CRITICAL, 1 MEDIUM, 11 LOW
Other records, highest priority first
- TI-2026-16755 Memory corruption in Apple iOS and iPadOSPriority CRITICAL 93
- TI-2026-16707 Uncontrolled resource consumption in Apple iOS and iPadOSPriority MEDIUM 40
- TI-2026-16731 Out-of-bounds read in Apple iOS and iPadOSPriority LOW 36
- Release ·
Apple Safari 26.3
8 records Highest priority Priority MEDIUM 1 MEDIUM, 7 LOW
Other records, highest priority first
- TI-2026-16709 Uncontrolled resource consumption in Apple SafariPriority MEDIUM 40
- TI-2026-16716 Path traversal in Apple SafariPriority LOW 34
- TI-2026-16701 Memory corruption in Apple SafariPriority LOW 29
Vendor assessments
Red Hat
Red Hat rating: Important. 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-2026-20635
- 2026-10-03 Alias added: GHSA-hjj6-wmh2-qhwj
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-2026-20635 · CVE Program
- CVE-2026-20635 · NVD
- FIRST EPSS
- GHSA-hjj6-wmh2-qhwj · GitHub Advisory Database · CC BY 4.0
- CVE-2026-20635 · 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