PatchTheCVECVE-2026-84531: An out-of-bounds write issue was addressed with improved bounds checking
CVE-2026-84531 is a medium-severity flaw (CVSS 6.2) affecting ipados, iphone os, macos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27. Processing maliciously crafted NTLM input may lead to unexpected app termination.
Why this priority
- No elevated risk signals yet
A fixed release or distro patch exists.
Risk facts
| CVSS score | 6.2 (Medium) |
| Attack vector | Local |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.1% (top 96%) |
| CISA exploited list | No |
| Weakness | CWE-787 |
| Published | 2026-09-14 |
| Last modified | 2026-09-18 |
Last updated 2026-09-18 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-84531?
ipados: upgrade to 27.0; iphone os: upgrade to 27.0; macos: upgrade to 27.0. Exact commands for each OS are on this page.
Is CVE-2026-84531 being exploited?
CVE-2026-84531 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-84531 affect?
CVE-2026-84531 affects ipados, iphone os, macos. Severity is medium (CVSS 6.2). An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 27 and iPadOS 27, macOS Golden Gate 27. Processing maliciously crafted NTLM input may lead to unexpected app termination.
How urgent is CVE-2026-84531?
Priority 23/100. No elevated risk signals yet.
Software pages
iOS vulnerabilities · macOS vulnerabilities · iPadOS vulnerabilities
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