CVE-2026-20636Network attack vector

Process crash via undisclosed WebKit memory handling

Published Feb 11, 2026 · Updated Feb 11, 2026

Memory corruption in WebKit before 26.3 allows remote attackers to crash Safari and affected Apple platform processes via malicious web content. Apple identifies the locus only as WebKit and has not disclosed the memory operation that mishandles attacker-controlled content. A user must cause the crafted content to be rendered; the published impact is limited to interruption of the affected process.

CVSS severity6.5
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Memory corruption in WebKit before 26.3 allows remote attackers to crash Safari and affected Apple platform processes via malicious web content. Apple identifies the locus only as WebKit and has not disclosed the memory operation that mishandles attacker-controlled content. A user must cause the crafted content to be rendered; the published impact is limited to interruption of the affected process.

The record

CVE
CVE-2026-20636
Published
Feb 11, 2026
Updated
Feb 11, 2026
Vendor
Apple
Product
iOS and iPadOS
Classifications
CWE-120, CWE-119, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <26.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Apple · iOS and iPadOSversion=unspecified <26.3
Apple · visionOSversion=unspecified <26.3
Apple · Safariversion=unspecified <26.3
Apple · macOSversion=unspecified <26.3

Published CVSS scores

8.8redhat-SADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo