Security readout for executives and security teams
Plain-English summary
A memory-safety flaw in Apple operating systems can let an app crash the device or corrupt highly privileged kernel memory. Kernel corruption can threaten confidentiality, integrity, and availability, although the supplied evidence does not establish successful exploitation or attacks in the wild. Apple has released corrected operating-system versions.
Executive priority
Prioritize accelerated patching across managed Apple fleets because kernel-memory corruption carries severe potential impact. Focus first on exposed, privileged, or business-critical devices. Active exploitation is not established, so communicate this as urgent risk reduction rather than evidence of an ongoing incident.
Technical view
CVE-2026-43778 is a CWE-416 use-after-free addressed through improved memory management. Apple states that an app may trigger unexpected system termination or kernel-memory corruption. The supplied CVSS 3.1 score is 9.8. Fixed releases cover supported branches of iOS, iPadOS, macOS, tvOS, visionOS, and watchOS.
Likely exposure
Devices running releases older than the listed fixed versions may require attention. The bundle does not provide reliable lower affected-version boundaries, so exposure cannot be determined from its affected-version entries. Inventory each Apple platform and compare its installed release with the applicable fixed branch.
Exploitation context
The bundle marks this CVE as absent from KEV and provides no cited evidence of active exploitation, public exploit availability, or observed attacks. Apple describes impact from an app, while the supplied CVSS vector indicates network reachability; this discrepancy should be resolved through current vendor guidance before modeling attack paths.
Researcher notes
The supplied affected-version values are placeholders and should not be used for range matching. Apple attributes the issue to an app, but the supplied CVSS vector is AV:N/PR:N/UI:N. No vulnerable component, trigger conditions, or exploitation mechanics are identified. Preserve this uncertainty in scanners, threat models, and advisories.
Mitigation direction
- Update iOS and iPadOS to 18.7.10 or 26.6, according to the device's supported release branch.
- Update macOS to Sequoia 15.7.8, Sonoma 14.8.8, or Tahoe 26.6, as applicable.
- Update supported Apple TV, Vision Pro, and Apple Watch devices to operating-system version 26.6.
- Check Apple security guidance for deployment prerequisites, superseding releases, and any newly documented mitigations.
Validation and detection
- Inventory Apple devices and record each operating-system edition, branch, and installed version.
- Confirm managed devices report an applicable fixed version or a later vendor-supported security release.
- Identify unsupported or update-blocked devices and document compensating controls or replacement plans.
- Review endpoint and crash telemetry for unexplained system terminations, without treating crashes alone as proof of exploitation.
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-416: 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-2026-43778 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/128066CVE reference, apple
- https://support.apple.com/en-us/128067CVE reference, apple
- https://support.apple.com/en-us/128068CVE reference, apple
- https://support.apple.com/en-us/128069CVE reference, apple
- https://support.apple.com/en-us/128070CVE reference, apple
- https://support.apple.com/en-us/128071CVE reference, apple
- https://support.apple.com/en-us/128072CVE reference, apple
- https://support.apple.com/en-us/148287CVE 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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.