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PatchSiren cyber security CVE debrief

CVE-2026-20636 Apple CVE debrief

CVE-2026-20636 is a vulnerability in Apple Safari and other products that could lead to an unexpected process crash when processing maliciously crafted web content. The issue was addressed with improved memory handling. This vulnerability affects multiple Apple products, including Safari, iOS, iPadOS, macOS, and visionOS. The CVSS score for this vulnerability is 6.5, indicating a medium severity level. The vulnerability was published on February 11, 2026, and modified on June 30, 2026.

Vendor
Apple
Product
Safari
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-02-11
Original CVE updated
2026-07-15
Advisory published
2026-02-11
Advisory updated
2026-07-15

Who should care

Organizations and individuals using Apple Safari, iOS, iPadOS, macOS, and visionOS should be aware of this vulnerability and take necessary steps to update their systems. This vulnerability could be exploited by processing maliciously crafted web content, leading to an unexpected process crash. Users of these products should prioritize updating to the latest versions to mitigate this vulnerability.

Technical summary

The CVE-2026-20636 vulnerability is caused by a memory handling issue in Apple Safari and other products. Processing maliciously crafted web content can lead to an unexpected process crash. The vulnerability has a CVSS score of 6.5 and affects multiple Apple products, including Safari, iOS, iPadOS, macOS, and visionOS. The issue was addressed with improved memory handling in Safari 26.3, iOS 26.3 and iPadOS 26.3, macOS Tahoe 26.3, and visionOS 26.3. The vulnerability was published on February 11, 2026, and modified on June 30, 2026.

Defensive priority

Medium priority should be given to updating Apple Safari, iOS, iPadOS, macOS, and visionOS to the latest versions to mitigate this vulnerability. Organizations and individuals should prioritize updating their systems to prevent potential exploitation.

Recommended defensive actions

  • Update Apple Safari to version 26.3 or later
  • Update iOS to version 26.3 or later
  • Update iPadOS to version 26.3 or later
  • Update macOS to version 26.3 or later
  • Update visionOS to version 26.3 or later

Evidence notes

The CVE-2026-20636 vulnerability was published on February 11, 2026, and modified on June 30, 2026. The vulnerability affects multiple Apple products, including Safari, iOS, iPadOS, macOS, and visionOS. The CVSS score for this vulnerability is 6.5, indicating a medium severity level. The issue was addressed with improved memory handling in Safari 26.3, iOS 26.3 and iPadOS 26.3, macOS Tahoe 26.3, and visionOS 26.3.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-20636 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-20636

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-20636 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-20636

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.