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Report · Zero Day InitiativeAbout CVE-2026-86974Published

ZDI-26-830: Apple Safari jsToWasm IC Entrypoint Type Confusion Remote Code Execution Vulnerability

Source Zero Day Initiative

0
Authoritative record:CVE-2026-86974· High

Not known to be exploited : upgrade to 27.2 soon.

Data as of 28 Oct 2026, 22:32 UTC

Severity
High

Rated High by Zero Day Initiative · CVSS not yet scored by NVD

Patch
Available – fixed in 27.2, 26.7.2

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 26 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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

ProductAffectedFixed in
AppleSafariAffected
  • <27.2
Fixed in
  • 27.2
AppleiOS and iPadOSAffected
  • <27.2
Fixed in
  • 27.2
AppleiOS and iPadOSAffected
  • <26.7.2
Fixed in
  • 26.7.2
ApplemacOSAffected
  • <27.2
Fixed in
  • 27.2
ApplevisionOSAffected
  • <27.2
Fixed in
  • 27.2

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.

References

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