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CVE-2026-20635VulnerabilityPublished Updated

CVE-2026-20635: Apple Safari · Processing maliciously crafted web content may lead to an unexpected process crash

Affects Apple SafariSource CVE Database V5

0

Not known to be exploited · CVSS 4.3 High : upgrade to 26.3 soon.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score
4.3High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 28% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 26.3, 18.7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 11 Feb 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 2026-10-25.

What to do

Upgrade Safari and macOS and tvOS and visionOS and watchOS to 26.3; iOS and iPadOS to 26.3 or 18.7.5.

Affected software

ProductAffectedFixed in
AppleSafariAffected
  • <26.3
Fixed in
  • 26.3
AppleiOS and iPadOSAffected
  • <18.7.5
  • <26.3
Fixed in
  • 26.3
  • 18.7.5
ApplemacOSAffected
  • <26.3
Fixed in
  • 26.3
AppletvOSAffected
  • <26.3
Fixed in
  • 26.3
ApplevisionOSAffected
  • <26.3
Fixed in
  • 26.3
ApplewatchOSAffected
  • <26.3
Fixed in
  • 26.3

AI-suggested

A fix is available from Apple in Safari 26.3 and corresponding OS updates (iOS 18.7.5, iPadOS 18.7.5, macOS Tahoe 26.3, tvOS 26.3, visionOS 26.3, watchOS 26.3). Users and administrators should update to these versions to remediate the vulnerability. Red Hat has also released security updates for webkitgtk4 packages addressing this issue for Red Hat Enterprise Linux 7 Extended Lifecycle Support. Applying these vendor-provided patches is the recommended mitigation. No additional action is required beyond applying the official fixes.

Description

The issue was addressed with improved memory handling. This issue is fixed in Safari 26.3, iOS 18.7.5 and iPadOS 18.7.5, iOS 26.3 and iPadOS 26.3, macOS Tahoe 26.3, tvOS 26.3, visionOS 26.3, watchOS 26.3. Processing maliciously crafted web content may lead to an unexpected process crash.

References

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