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[Security] 8.19.21 release notes #7200

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1 change: 1 addition & 0 deletions docs/release-notes.asciidoc
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This section summarizes the changes in each release.

* <<release-notes-8.19.21, {elastic-sec} version 8.19.21>>
* <<release-notes-8.19.20, {elastic-sec} version 8.19.20>>
* <<release-notes-8.19.19, {elastic-sec} version 8.19.19>>
* <<release-notes-8.19.18, {elastic-sec} version 8.19.18>>
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22 changes: 22 additions & 0 deletions docs/release-notes/8.19.asciidoc
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[[release-notes-header-8.19.0]]
== 8.19

[discrete]
[[release-notes-8.19.21]]
=== 8.19.21

[discrete]
[[enhancements-8.19.21]]
==== Enhancements
* Adds **Destination IP** as a built-in **Group alerts by** option on the alerts table, and includes aggregatable IP fields in the **Custom field** picker ({kibana-pull}284769[#284769]).
* Improves {elastic-defend} logs for a down output connection, including the remaining backoff time.

[discrete]
[[bug-fixes-8.19.21]]
==== Fixes
* Fixes an issue where previously applied filters on the **Notes** page were not shown in the filter controls after navigating away and returning, even though the filters were still active ({kibana-pull}286574[#286574]).
* Fixes an issue where Google Gemini 3.x models rejected requests that included tools with unconstrained string parameters ({kibana-pull}286302[#286302]).
* Fixes an issue where detection rule exception items that use **IP range** value lists with more than 200 dash-notation entries were dropped during rule execution ({kibana-pull}285178[#285178]).
* Updates a `curl` dependency in {elastic-defend} to resolve https://github.com/advisories/GHSA-gv3v-x3f3-7fxm[CVE-2024-8096].
* Updates an OpenSSL dependency in {elastic-defend} to resolve multiple CVEs, including https://github.com/advisories/GHSA-f9v2-4w9p-2cwc[CVE-2026-34182] and https://github.com/advisories/GHSA-5888-36j9-c92p[CVE-2025-66199].
* Updates a `zlib` dependency in {elastic-defend} to resolve https://github.com/advisories/GHSA-h858-mf2m-8jf4[CVE-2026-27171].
* Fixes a deadlock between {elastic-defend} malware protection and SSSD on Active Directory-joined Linux hosts that could stall process executions and disable malware protection with the message `Disabled due to potential system deadlock`.
* Fixes an issue where {elastic-defend} on Linux intermittently failed to enable event collection on hosts with a large number of active network connections.

[discrete]
[[release-notes-8.19.20]]
=== 8.19.20
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