[CI] RdnFieldExtractorTests testExtractWithMalformedDerData failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #11503 / openjdk21_checkpart4_java-matrix
• elasticsearch-periodic-platform-support #11442 / rhel-8_platform-support-unix

Reproduction Line:

./gradlew ":x-pack:plugin:security:test" --tests "org.elasticsearch.xpack.security.authc.pki.RdnFieldExtractorTests.testExtractWithMalformedDerData" -Dtests.seed=4C3B06D66A569977 -Dtests.locale=en-ZM -Dtests.timezone=Antarctica/Casey -Druntime.java=21

Applicable branches:
8.19

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.NegativeArraySizeException: -1830100149

Issue Reasons:

• [8.19] 2 failures in test testExtractWithMalformedDerData (1.0% fail rate in 201 executions)

Note:
This issue was created using new test triage automation. Please report issues or feedback to es-delivery.

[elasticsearchmachine]

Pinging @elastic/es-security (Team:Security)

[ebarlas]

Created test fix PR targeting main branch: #138683

I'll back-port once it is reviewed.