Security readout for executives and security teams
Plain-English summary
CVE-2026-20602 is an Apple macOS denial-of-service issue. A local app may be able to make the system or affected component unavailable. Apple says the issue was fixed by improving cache handling in macOS Sequoia 15.7.4, Sonoma 14.8.4, and Tahoe 26.3.
Executive priority
Treat as routine but timely endpoint patching. The issue affects availability, requires local app execution, and has no cited active exploitation. Prioritize managed macOS fleets where downtime disrupts business operations or where users can run untrusted software.
Technical view
The CVE is described as CWE-400 resource consumption caused by cache handling. CVSS 3.1 is 5.5: local attack vector, low complexity, low privileges, no user interaction, and high availability impact. No confidentiality or integrity impact is listed in the provided record.
Likely exposure
Exposure is primarily macOS endpoints not updated to the Apple fixed releases named for their major version. The attacker must already run an app locally with low privileges, limiting remote exposure but still relevant for managed fleets and shared systems.
Exploitation context
The provided sources do not report active exploitation, and the CVE is not marked in KEV. Public details are limited to a local app causing denial-of-service through cache handling behavior. No exploit mechanics are provided in the source bundle.
Researcher notes
The public record is sparse. Apple attributes the fix to improved cache handling and assigns availability-only impact. Research should focus on patch-diffing and resource-consumption behavior, but avoid assuming the affected component or exploitability beyond the CVE and Apple advisory text.
Mitigation direction
- Update macOS Sequoia systems to 15.7.4 or later per Apple guidance.
- Update macOS Sonoma systems to 14.8.4 or later per Apple guidance.
- Update macOS Tahoe systems to 26.3 or later per Apple guidance.
- Monitor Apple advisories for any revised affected-version or mitigation information.
Validation and detection
- Inventory macOS endpoints by major version and patch level.
- Confirm Sequoia endpoints report 15.7.4 or later.
- Confirm Sonoma endpoints report 14.8.4 or later.
- Confirm Tahoe endpoints report 26.3 or later.
- Review endpoint reliability alerts for unexplained local denial-of-service symptoms.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-400: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-20602 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 5.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
5.5MediumVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://support.apple.com/en-us/126348CVE reference
- https://support.apple.com/en-us/126349CVE reference
- https://support.apple.com/en-us/126350CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.