Uncontrolled resource consumption in Apple Safari
Priority LOW 24CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- Partial Red Hat: 15 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-400.
Summary
This issue was addressed through improved state management. This issue is fixed in Safari 26.3, iOS 26.3 and iPadOS 26.3, macOS Tahoe 26.3, visionOS 26.3. A website may be able to track users through Safari web extensions.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00273 19th percentileScored 2026-11-07
Fix Partial Safari (Apple): 26.3iOS and iPadOS (Apple): 26.3+2 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 26.3 | 26.3 | Patch available | CNA |
| Apple | macOS | before 26.3 | 26.3 | Patch available | CNA |
| Apple | visionOS | 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 26.3 Fixed in 26.3 Patch available CNA
- macOS 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
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:* | before 26.3 | Vulnerable | Apple |
| cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:* | before 26.3 | Vulnerable | Apple |
| cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* | before 26.3 | Vulnerable | Apple |
| cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* | before 26.3 | Vulnerable | Apple |
| cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:* | 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 26.3 Vulnerable ·Apple
- cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:* Versions before 26.3 Vulnerable ·Apple
- cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:* Versions before 26.3 Vulnerable ·Apple
- cpe:2.3:o:apple:visionos:*:*:*:*:*:*:*:* Versions before 26.3 Vulnerable ·Apple
Remediation
- Fix · CNA Safari (Apple) Fixed in 26.3
- Fix · CNA iOS and iPadOS (Apple) Fixed in 26.3
- Fix · CNA macOS (Apple) Fixed in 26.3
- Fix · CNA visionOS (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 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
Show 2 more groups
- Release ·
Apple iOS and iPadOS 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 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: 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-2026-20676
- 2026-10-03 Alias added: GHSA-cpw4-rfmm-h598
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-2026-20676 · CVE Program
- CVE-2026-20676 · NVD
- FIRST EPSS
- GHSA-cpw4-rfmm-h598 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-20676 · 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