Security readout for executives and security teams
Plain-English summary
A remotely reachable memory-safety flaw affects multiple Apple operating systems. Successful exploitation may crash an application or corrupt heap memory, potentially threatening confidentiality, integrity, and availability. Apple addressed the flaw through improved bounds checking in current security releases.
Executive priority
Treat as an urgent patching priority because the flaw is remotely reachable, requires no privileges or user action, and may corrupt memory. Expedite enterprise Apple updates while avoiding claims of active attacks, which the supplied evidence does not support.
Technical view
CVE-2026-64771 is a CWE-119 buffer overflow with CVSS 3.1 score 9.8. The supplied vector indicates network access, low complexity, no privileges, and no user interaction. Apple states a remote attacker may cause unexpected application termination or heap corruption. The vulnerable component and precise affected-version boundaries are not provided.
Likely exposure
Potentially exposed assets include iPhone, iPad, Mac, Apple TV, and Vision Pro devices running releases older than the named fixed versions. Exact vulnerable version ranges and the affected component are absent, so inventory-based exposure estimates remain incomplete.
Exploitation context
The bundle does not establish active exploitation, public exploit availability, or inclusion in CISA KEV; KEV is explicitly false. Remote reachability and heap corruption make the issue intrinsically serious, but practical exploitability cannot be confirmed from the available evidence.
Researcher notes
Important technical gaps remain: Apple’s affected component, protocol or service, triggering conditions, and exact vulnerable-version ranges are not supplied. The CVSS vector implies broad impact, but the available description confirms only possible application termination or heap corruption. Reassess when Apple or CVE records add detail.
Mitigation direction
- Update iPhones and iPads to iOS or iPadOS 26.6.
- Update Sequoia Macs to 15.7.8 and Tahoe Macs to 26.6.
- Update Apple TV and Vision Pro devices to version 26.6.
- Prioritize remotely exposed and business-critical Apple devices.
- Review Apple guidance for any additional platform-specific measures.
Validation and detection
- Inventory affected Apple devices and their installed operating-system versions.
- Confirm updates completed successfully through device-management or local version records.
- Identify devices below the named fixed releases and assign remediation owners.
- Monitor Apple advisories for component details or revised affected-version ranges.
- Check security monitoring for unexplained application crashes on unpatched devices.
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-119: 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-2026-64771 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/128069CVE reference, apple
- https://support.apple.com/en-us/128070CVE 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.
Improper Restriction of Operations within the Bounds of a Memory Buffer
Improper Restriction of Operations within the Bounds of a Memory Buffer represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.