ZDI-26-830: Apple Safari jsToWasm IC Entrypoint Type Confusion Remote Code Execution Vulnerability
Source Zero Day Initiative
Not known to be exploited : upgrade to 27.2 soon.
Data as of 28 Oct 2026, 22:32 UTC
Rated High by Zero Day Initiative · CVSS not yet scored by NVD
- Patch
- Available – fixed in 27.2, 26.7.2
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 Safari and macOS and visionOS to 27.2; iOS and iPadOS to 27.2 or 26.7.2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| AppleSafari | Affected
| Fixed in
|
| AppleiOS and iPadOS | Affected
| Fixed in
|
| AppleiOS and iPadOS | Affected
| Fixed in
|
| ApplemacOS | Affected
| Fixed in
|
| ApplevisionOS | Affected
| Fixed in
|
Description
A type confusion vulnerability in Apple Safari's jsToWasm IC entrypoint allows remote attackers to execute arbitrary code. Exploitation requires user interaction, such as visiting a malicious webpage or opening a malicious file. The vulnerability is assigned CVE-2026-86974 with a high severity rating of 8.8 by ZDI.