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CVE-2026-55955 is an improper-authentication vulnerability in Apache Tomcat's cluster component. The EncryptionInterceptor does not protect encrypted cluster messages against replay, allowing previously captured messages to be resent and accepted. Affected releases are Tomcat 11.0.0-M1 through 11.0.22, 10.1.0-M1 through 10.1.55, 9.0.13 through 9.0.118, 8.5.38 through 8.5.100, and 7.0.100 through 7.0.109.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
22 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced in a Nutanix AOS security notice/plugin, but no specific technical details are provided in the content.
An Apache Tomcat vulnerability addressed in the July 2026 security update; specific technical details are not provided in the content.
An improper-authentication flaw in Apache Tomcat's cluster-component EncryptionInterceptor that permits replay attacks.
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.