CVE-2026-84590: Apple macOS · A remote attacker may be able to cause unexpected app termination or heap corruption
Affects Apple macOSSource CVE Database V5
Not known to be exploited · fixed in 27.2 : patch Apple macOS soon.
Data as of 26 Oct 2026, 21:17 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
- Patch
- Available – fixed in 27.2, 26.7.2, 15.8.2
Exploitation evidence
Disclosed: evidence found.
CVE published 26 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade Apple macOS to 27.2, 26.7.2 or 15.8.2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| ApplemacOS | Affected
| Fixed in
|
| ApplemacOS | Affected
| Fixed in
|
| ApplemacOS | Affected
| Fixed in
|
AI-suggested
Apply the official fixes by upgrading to macOS Golden Gate 27.2, macOS Sequoia 15.8.2, or macOS Tahoe 26.7.2. These versions contain the improved bounds checking that resolves the vulnerability.
Description
CVE-2026-84590 is an out-of-bounds write vulnerability in Apple macOS that could allow a remote attacker to cause unexpected application termination or heap corruption. The issue was addressed by improved bounds checking and fixed in macOS Golden Gate 27.2, macOS Sequoia 15.8.2, and macOS Tahoe 26.7.2.