This issue was addressed through improved state management. This issue is fixed in Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, tvOS 26.4, visionOS 26.4, watchOS 26.4. Processing maliciously crafted web content may prevent Content Security Policy from being enforced.
CVE-2026-20665
MEDIUMPre-NVD 6.56.5—Trending — 4 sources updated this week
EchelonGraph scoreMEDIUM confidence
Score 6.5 from GitHub Security Advisory published 2026-03-25. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.
Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, ghsa
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: None knownExposed: 0
A fix is available — apply it.
- CVSS v3
- 6.5
- EG Score
- 6.5(medium)
- EG Risk
- 44(Track)EG Risk 44/100SSVC: Track
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity65% × 45%Exploitation0% × 40%Automatability100% × 15%Action: Routine — remediate on your standard cadence. - EPSS PROB
- 1%
- EPSS %ILE
- 46%
- KEV
- Not listed
Published
March 25, 2026
Last Modified
June 17, 2026
References (7)
- product-security@applehttps://support.apple.com/en-us/126792
- product-security@applehttps://support.apple.com/en-us/126793
- product-security@applehttps://support.apple.com/en-us/126794
- product-security@applehttps://support.apple.com/en-us/126797
- product-security@applehttps://support.apple.com/en-us/126798
- product-security@applehttps://support.apple.com/en-us/126799
- product-security@applehttps://support.apple.com/en-us/126800
Vendor Advisories for CVE-2026-20665(11)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2026:22136Red Hat Product SecurityHigh
Red Hat Security Advisory: webkitgtk4 security update
- RHSA-2026:19535Red Hat Product SecurityHigh
Red Hat Security Advisory: webkit2gtk3 security update
- RHSA-2026:19206Red Hat Product SecurityHigh
Red Hat Security Advisory: webkit2gtk3 security update
- RHSA-2026:16695Red Hat Product SecurityHigh
Red Hat Security Advisory: webkit2gtk3 security update
- RHSA-2026:16056Red Hat Product SecurityHigh
Red Hat Security Advisory: webkit2gtk3 security update
- RHSA-2026:14659Red Hat Product SecurityHigh
Red Hat Security Advisory: webkit2gtk3 security update
- RHSA-2026:13845Red Hat Product SecurityHigh
Red Hat Security Advisory: webkit2gtk3 security update
- RHSA-2026:11814Red Hat Product SecurityHigh
Red Hat Security Advisory: webkit2gtk3 security update
- +3 more
Patch Availability(11)
| Vendor / Ecosystem | Fixed in / Patch | Released | Source |
|---|---|---|---|
| redhat | webkitgtk4-0:2.52.3-1.el7_9 | 2026-06-01 | redhat |
| redhat | webkit2gtk3-0:2.52.3-1.el9_0 | 2026-05-20 | redhat |
| 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.
Data Freshness Timeline
(refreshed 4× in last 7d / 4× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-27 14:13 UTCEPSS rescore
- 2026-07-27 12:50 UTCEG score recompute
- 2026-07-27 12:50 UTCVendor advisory
- 2026-07-27 12:50 UTCGHSA enrichment
Frequently asked(5)
What is CVE-2026-20665?
CVE-2026-20665 is a medium vulnerability published on March 25, 2026. This issue was addressed through improved state management. This issue is fixed in Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, tvOS 26.4, visionOS 26.4, watchOS 26.4. Processing maliciously crafted web content may prevent Content Security Policy from being…
When was CVE-2026-20665 disclosed?
CVE-2026-20665 was first published in the National Vulnerability Database on March 25, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20665 actively exploited?
CVE-2026-20665 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.4% of all scored CVEs.
What is the CVSS score of CVE-2026-20665?
CVE-2026-20665 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-20665?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20665, 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
Explore the affected products and dependency analysis for CVE-2026-20665
Is Your Infrastructure Affected by CVE-2026-20665?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.