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Oracle Critical Patch Update April 2026

Released April 2026 · Oracle's advisory ↗ · ← Critical Patch Update, January 2026 · Security Patch Update, May 2026 →

421 CVEs in this release, one square each

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Share this chart Oracle Critical Patch Update April 2026, one square per CVE: 172 Java CVEs, 16 protected by Waratek, 8 exploited, 249 other CVEs in this release.

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16Protected by Waratek4Mitigation candidate152No exploit published10Outside Waratek scope239Not applicable 8Exploited, marked by the ring

No exploit published. For 51 of them, Oracle's security advisory is the source of public detail.

Protected by Waratek. Waratek RASP can block exploitation of these on systems that have not applied the patch yet.

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Overview 1 match · 0 exploited · 0 CISA KEV · 0 public PoC · 0 EPSS ≥ 0.5
1match 0exploited0.0% 0CISA KEV0.0% 0public PoC0.0% 0EPSS ≥ 0.50.0%
Protected by Waratek 1 100.0% Rule in development 0 0.0% Mitigation candidate 0 0.0% No exploit published 0 0.0%
Critical 0 0.0% High 0 0.0% Medium 1 100.0% Low 0 0.0% None 0 0.0% Unknown 0 0.0%
blocked by ARMR today 1 100.0% partly blocked 0 0.0% not blocked 0 0.0% not established 0 0.0% unrecorded 0 0.0%
Exploited 0 0.0% Working exploit published 0 0.0% Proof of concept only 0 0.0% Forecast only 0 0.0% No public exploit 1 100.0%
split by peak 1 / month
Protected by Waratek: 1 Medium: 1 blocked by ARMR today: 1 No public exploit: 1
Dec 201 Protected by Waratek1 Medium1 blocked by ARMR today1 No public exploit1
Dec 20
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CVE Severity Published▾ Status Exploitation Description
CVE-2020-17521 Medium 2020-12-07 Protected by Waratek No public exploit Apache Groovy provides extension methods to aid with creating temporary directories. Prior to this fix, Groovy's implementation of those extension methods was using a now superseded Java JDK method call that is potentially not secure on some operating systems in some contexts. Users not using the extension methods mentioned in the advisory are not affected, but may wish to read the advisory for further details. Versions Affected: 2.0 to 2.4.20, 2.5.0 to 2.5.13, 3.0.0 to 3.0.6, and 4.0.0-alpha-1. Fixed in versions 2.4.21, 2.5.14, 3.0.7, 4.0.0-alpha-2.