Security readout for executives and security teams
Plain-English summary
A flaw in macOS could let an app trigger an unexpected system shutdown or crash. Apple corrected the integer-overflow condition by strengthening input validation in current security releases. The supplied record rates the issue critical, but it does not identify the affected component or support impacts beyond system termination.
Executive priority
Prioritize expedited patching across managed Macs, especially systems that execute third-party applications. Treat unpatched devices as potentially exposed, but avoid assuming compromise: the supplied evidence describes a denial-of-service outcome and provides no support for active exploitation.
Technical view
CVE-2026-43764 is a CWE-190 integer overflow in an unspecified macOS component. Apple states that improved input validation resolves the issue and that an app may cause unexpected system termination. The supplied CVSS 3.1 score is 9.8, although the disclosed impact and prerequisites do not fully explain that vector.
Likely exposure
Potential exposure includes Macs running releases older than macOS Sequoia 15.7.8, Sonoma 14.8.8, or Tahoe 26.6. The source bundle does not provide reliable lower version bounds, affected hardware details, or the vulnerable component, so exact fleet exposure cannot be determined from these sources alone.
Exploitation context
The source bundle does not report active exploitation, and the CVE is not identified as being in CISA's Known Exploited Vulnerabilities catalog. Public details only state that an app may trigger unexpected system termination; they do not establish remote exploitation, code execution, or data compromise.
Researcher notes
Important details remain undisclosed: the affected subsystem, vulnerable version range, triggering input, privilege boundary, and whether impacts extend beyond termination. The supplied CVSS vector claims network reachability and complete confidentiality, integrity, and availability impact, but the narrative only describes an app causing termination. Further vendor clarification is needed.
Mitigation direction
- Update Sequoia systems to macOS 15.7.8 or later.
- Update Sonoma systems to macOS 14.8.8 or later.
- Update Tahoe systems to macOS 26.6 or later.
- Prioritize managed endpoints that run untrusted or externally sourced applications.
- Check Apple guidance for any model-specific eligibility or additional precautions.
Validation and detection
- Inventory macOS edition and version across all managed Macs.
- Confirm each device meets or exceeds its edition's fixed release.
- Verify updates completed successfully and devices restarted where required.
- Review endpoint telemetry for unexplained application-linked system terminations.
- Track unsupported or update-ineligible Macs as unresolved exposure.
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-190: 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-2026-43764 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
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.
SSVC decision data
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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://support.apple.com/en-us/128067CVE reference, apple
- https://support.apple.com/en-us/128071CVE reference, apple
- https://support.apple.com/en-us/128072CVE reference, apple
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.
Integer Overflow or Wraparound
Integer Overflow or Wraparound represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.