CVEs / CVE-2026-20700
CVE-2026-20700: Apple Multiple Buffer Overflow Vulnerability
- Known exploited in the CISA KEV catalog since 12 Feb 2026
- high 7.8 CVSS 3.1 (from the CNA)
- EPSS 1.67% chance of exploitation in the next 30 days, higher than 76% of CVEs (30 Oct 2026)
- Last changed at its sources
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Summary
Apple iOS, macOS, tvOS, watchOS, and visionOS contain an improper restriction of operations within the bounds of a memory buffer vulnerability that could allow an attacker with memory write the capability to execute arbitrary code.
Description
A memory corruption issue was addressed with improved state management. This issue is fixed in iOS 26.3 and iPadOS 26.3, macOS Tahoe 26.3, tvOS 26.3, visionOS 26.3, watchOS 26.3. An attacker with memory write capability may be able to execute arbitrary code. Apple is aware of a report that this issue may have been exploited in an extremely sophisticated attack against specific targeted individuals on versions of iOS before iOS 26. CVE-2025-14174 and CVE-2025-43529 were also issued in response to this report.
Affected and fixed versions
| Product | Affected | Fixed in |
|---|---|---|
| Apple iOS and iPadOS | before 26.3 | 26.3 |
| Apple macOS | before 26.3 | 26.3 |
| Apple tvOS | before 26.3 | 26.3 |
| Apple visionOS | before 26.3 | 26.3 |
| Apple watchOS | before 26.3 | 26.3 |
Exploitation
| In CISA KEV since | 12 Feb 2026 |
|---|---|
| Due date for US federal agencies | 5 Mar 2026 |
| Used in ransomware campaigns | Unknown |
| Required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
Severity
| CVSS 3.1 | 7.8 highCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HScored by the CNA (134c704f-9b21-4f2e-91b3-4a467353bcc0) |
|---|---|
| Weakness | CWE-119 |
References
- CVE-2026-20700 on NVD
- CVE-2026-20700 in the CISA KEV catalog
- https://support.apple.com/en-us/126346 (cited by CISA)
- https://support.apple.com/en-us/126348 (cited by CISA)
- https://support.apple.com/en-us/126351 (cited by CISA)
- https://support.apple.com/en-us/126352 (cited by CISA)
- https://support.apple.com/en-us/126353 (cited by CISA)
- https://support.apple.com/en-us/126346 Release Notes, Vendor Advisory
- https://support.apple.com/en-us/126348 Release Notes, Vendor Advisory
- https://support.apple.com/en-us/126351 Release Notes, Vendor Advisory
- https://support.apple.com/en-us/126352 Release Notes, Vendor Advisory
- https://support.apple.com/en-us/126353 Release Notes, Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20700 US Government Resource
Sources
Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.
This product uses data from the NVD API but is not endorsed or certified by the NVD.