CVE-2026-20636

MEDIUMNVD 6.56.5—

6.5

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

CVSS v3: 6.5
EG Score: 6.5(medium)
EPSS: 18.8%
KEV: Not listed

Published

February 11, 2026

Last Modified

April 2, 2026

References (4)

product-security@applehttps://support.apple.com/en-us/126346
product-security@applehttps://support.apple.com/en-us/126348
product-security@applehttps://support.apple.com/en-us/126353
product-security@applehttps://support.apple.com/en-us/126354

Patch Availability(11)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
redhat	webkit2gtk3-0:2.52.3-1.el9_0	2026-05-20	redhat
ubuntu	webkitgtk-webdriver (2.52.3-0ubuntu0.26.04.2) @ resolute	2026-05-20	ubuntu
redhat	webkit2gtk3-0:2.52.3-1.el9_8	2026-05-19	redhat
redhat	webkit2gtk3-0:2.52.3-1.el9_2	2026-05-13	redhat
redhat	webkit2gtk3-0:2.52.3-1.el8_4	2026-05-11	redhat
redhat	webkit2gtk3-0:2.52.3-1.el9_4	2026-05-07	redhat
redhat	webkit2gtk3-0:2.52.3-1.el8_6	2026-05-05	redhat
redhat	webkit2gtk3-0:2.52.3-1.el8_8	2026-04-29	redhat
redhat	webkit2gtk3-0:2.52.3-1.el9_6	2026-04-28	redhat
redhat	webkit2gtk3-0:2.52.3-1.el8_10	2026-04-27	redhat
redhat	webkit2gtk3-0:2.52.3-0.el9_7.1	2026-04-22	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-119Buffer Operations Within Bounds (Buffer Overflow)

All Vendor Advisories

(11)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 18× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:44 UTCepss_batch
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2026-05-26 07:18 UTCepss_batch
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2026-05-26 07:18 UTCepss_batch
2026-05-22 21:16 UTCepss_batch
2026-05-21 22:43 UTCepss_batch

Frequently asked(5)

What is CVE-2026-20636?

CVE-2026-20636 is a medium vulnerability published on February 11, 2026. The issue was addressed with improved memory handling. This issue is fixed in Safari 26.3, iOS 26.3 and iPadOS 26.3, macOS Tahoe 26.3, visionOS 26.3. Processing maliciously crafted web content may lead to an unexpected process crash.

When was CVE-2026-20636 disclosed?

CVE-2026-20636 was first published in the National Vulnerability Database on February 11, 2026, with the most recent update on April 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-20636 actively exploited?

CVE-2026-20636 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 18.8% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-20636?

CVE-2026-20636 has a CVSS v3 base score of 6.5 (NVD).

How do I remediate CVE-2026-20636?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20636, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-20636

Published

Last Modified

References (4)

Patch Availability(11)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-20636?

Same vendor

Same CWE

CVE-2026-20636

📅 Published

🔄 Last Modified

🔗 References (4)

Patch Availability(11)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-20636?

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References (4)

Frequently asked(5)

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