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Vulnerabilities

Vulnerability · CVE-2026-86974

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

Published Oct 28, 2026 · ZDI-26-830: Apple Safari jsToWasm

Last checked Nov 5, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-86974. EPSS is 0.53%. Act only if a listed version of ZDI-26-830: Apple Safari jsToWasm is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (ZDI-26-830: Apple Safari jsToWasm).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High8.8
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.53%
Remediation
Not established
Affected products
See sources for product scope

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Apple Safari. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 8.8. The following CVEs are assigned: CVE-2026-86974.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-86974

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-86974. EPSS is 0.53%. Act only if a listed version of ZDI-26-830: Apple Safari jsToWasm is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.53%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 28, 2026 · Zero Day Initiative

    Detected

    This vulnerability allows remote attackers to execute arbitrary code on affected installations of Apple Safari. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 8.8. The following CVEs are assigned: CVE-2026-86974.

Sources

  • CVE.orgVulnerability recordCVE-2026-86974

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-86974

    30-day exploitation probability 0.53%

    first.org
  • OpenCVEVendor advisoryCVE-2026-86974

    CVE-2026-86974 is named on the public OpenCVE page.

    opencve.io
  • Zero Day InitiativeCoordinated disclosureZDI-26-830

    This vulnerability allows remote attackers to execute arbitrary code on affected installations of Apple Safari. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 8.8. The following CVEs are assigned: CVE-2026-86974.

    zerodayinitiative.com

Freshness

Last verified in this catalog Nov 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 5, 2026
  • Zero Day InitiativeNov 4, 2026
  • OpenCVENov 4, 2026
  • CVE.orgOct 29, 2026