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CVE-2026-43739

MEDIUM 5.5 ALL-YEARS

Published 2026-07-27 · Last modified 2026-07-28 · apple · NVD: Analyzed

An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 26.6 and iPadOS 26.6, macOS Tahoe 26.6, tvOS 26.6, visionOS 26.6, watchOS 26.6. An app may be able to cause unexpected system termination.

LIMITED SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.2%chance of exploitation in 30 days · 5th percentile

○ In CISA KEV○ Catalogued PoC◆ SSVC: exploitation none, automatable no

Impact if exploited

5.5CVSS 3.1 · MEDIUM · ADP

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityHigh

What an attacker needs

  • ⚠Access: Requires local access to the host
  • ✓Privileges: No account or privileges required
  • ⚠User interaction: A user must take an action (click / open a file)
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

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Affected

Vendors Apple

Products Ios And Ipados Macos Tvos Visionos Watchos Ipados Iphone Os

Weakness (CWE)

  • CWE-787: Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References and research data (JSON)

Known Affected Software Configurations

VendorProductVersion range
AppleIpados< 26.6
AppleIphone Os< 26.6
AppleMacos≥ 26.0 and < 26.6
AppleTvos< 26.6
AppleVisionos< 26.6
AppleWatchos< 26.6

All CVSS metrics

  • MEDIUM 5.5 v3.1 · ADP Primary
    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
  • MEDIUM 5.5 v3.1 · NVD Secondary
    CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

Advisories

Sources: NVD · CVE.org · All sources and attribution · EPSS