Security readout for executives and security teams
Plain-English summary
A malicious image can trigger a buffer overflow on affected Apple devices, potentially crashing the process handling it. Apple corrected the issue through improved memory handling in specified operating-system updates. The supplied evidence supports an availability impact, but does not establish data theft, code execution, or exploitation in the wild.
Executive priority
Prioritize prompt deployment through normal emergency patching procedures, especially on internet-connected or externally exposed devices processing untrusted content. The high rating reflects remotely reachable denial-of-service potential, not confirmed compromise. Escalate unsupported devices for replacement, isolation, or vendor-directed treatment.
Technical view
CVE-2026-43661 is a stack-based buffer overflow (CWE-121) reached when processing a maliciously crafted image. Its CVSS 3.1 score is 7.5, with network reachability, low complexity, no privileges, and no user interaction represented. The supplied vector rates availability impact high while confidentiality and integrity impacts are none.
Likely exposure
Exposure includes Apple devices running versions preceding the listed fixed releases that can process untrusted images. The bundle identifies iOS, iPadOS, macOS, tvOS, and watchOS, but does not provide complete affected-version ranges or identify the vulnerable image-processing component.
Exploitation context
The supplied sources do not report active exploitation, and the CVE is not marked as included in CISA KEV. A maliciously crafted image is required. No further delivery mechanism, proof of concept, attack prevalence, or demonstrated impact beyond possible process-memory corruption is established by the bundle.
Researcher notes
The record provides no vulnerable component name, affected-version boundaries, crash details, proof of concept, or evidence of code execution. CVSS indicates AV:N/AC:L/PR:N/UI:N with availability-only impact. Treat broader security consequences as unproven unless Apple or the CVE record publishes additional evidence.
Mitigation direction
- Update iPhones and iPads to iOS or iPadOS 26.5 or later.
- Update supported Macs to Sequoia 15.7.8, Sonoma 14.8.8, or Tahoe 26.5 or later.
- Update Apple TV and Apple Watch devices to tvOS 26.5 and watchOS 26.5 or later.
- Check Apple guidance for devices unable to install the listed fixed releases.
- Reduce processing of untrusted images until affected devices are updated.
Validation and detection
- Inventory iOS, iPadOS, macOS, tvOS, and watchOS devices and record installed versions.
- Confirm each device runs the applicable fixed release or a later vendor-supported version.
- Identify unmanaged or unsupported devices that cannot receive the listed updates.
- Review endpoint telemetry for unexplained image-processing crashes; such crashes alone do not prove exploitation.
- Recheck Apple advisories for revised affected-version or exploitation information.
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-121: 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-2026-43661 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
- High
- CVSS
- 7.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/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.
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:N/I:N/A:H3.93.6CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
7.5HighVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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/127110CVE reference, apple
- https://support.apple.com/en-us/127115CVE reference, apple
- https://support.apple.com/en-us/127118CVE reference, apple
- https://support.apple.com/en-us/127119CVE 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.
Stack-based Buffer Overflow
Stack-based Buffer Overflow represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.