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CVE-2026-34500 is an Apache Tomcat certificate-validation flaw affecting CLIENT_CERT authentication. In certain scenarios involving the Foreign Function and Memory (FFM) API, OCSP validation can soft-fail even when the administrator has disabled soft-fail behavior. Consequently, CLIENT_CERT authentication may not fail when certificate-status validation should reject the authentication attempt. Affected releases are Tomcat 11.0.0-M14 through 11.0.20, 10.1.22 through 10.1.53, and 9.0.92 through 9.0.116.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability in HPE Telco Service Orchestrator prior to v5.6.0 that may allow authentication bypass.
An Apache Tomcat OCSP certificate validation flaw that can cause CLIENT_CERT authentication to succeed unexpectedly due to improper soft-fail behavior under specific FFM API conditions.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.