Security readout for executives and security teams
Plain-English summary
A macOS application may write beyond an intended memory boundary and unexpectedly terminate the system. Apple addressed the issue through stronger bounds checking. Although the record assigns a critical 9.8 CVSS score, the supplied description confirms system termination only; it does not document code execution, data theft, or active exploitation.
Executive priority
Treat this as an urgent patching priority because the assigned score is critical and exploitation requires no stated privileges or user interaction. Complete applicability checks and deployment promptly, while avoiding claims of compromise: the supplied evidence does not establish active exploitation or impacts beyond unexpected termination.
Technical view
CVE-2026-43748 is a CWE-787 out-of-bounds write in macOS. The record assigns CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Apple states that an app may cause unexpected system termination. The affected component and precise attack path are not identified in the supplied sources.
Likely exposure
Potential exposure includes systems running macOS Sequoia earlier than 15.7.8 or macOS Tahoe earlier than 26.6. The supplied version data is incomplete and does not establish whether other macOS branches are affected, so organizations should confirm applicability against Apple's advisories and their asset inventory.
Exploitation context
The supplied record is not listed in KEV, and no supplied source reports active exploitation or a public exploit. This does not prove exploitation is absent. Evidence supports a remotely scored, low-complexity condition without privileges or user interaction, but the sparse description does not explain how an app reaches the vulnerable code.
Researcher notes
The public details are insufficient for reliable root-cause or reachability analysis. They identify CWE-787 and improved bounds checking but omit the affected component, vulnerable input, crash signature, and technical reproduction details. The CVSS impact claims exceed the concrete system-termination impact described, so additional Apple or CVE detail is needed before asserting confidentiality or integrity consequences.
Mitigation direction
- Update macOS Sequoia systems to 15.7.8 or later.
- Update macOS Tahoe systems to 26.6 or later.
- Prioritize exposed, privileged, and business-critical Mac systems.
- Check Apple guidance for applicability to other supported macOS branches.
- Use existing application-control safeguards until updates are complete.
Validation and detection
- Inventory macOS versions across managed and unmanaged endpoints.
- Confirm Sequoia devices report version 15.7.8 or later.
- Confirm Tahoe devices report version 26.6 or later.
- Review deployment reports for failed, deferred, or rolled-back updates.
- Monitor endpoint telemetry for unusual application-linked system terminations.
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-787: 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-2026-43748 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
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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.