{"id":"CVE-2026-101356","title":"tomcat: tomcat: Information disclosure via incorrect object recycling in HTTP/2 processing (CVE-2026-101356)","summary":"A flaw was found in Apache Tomcat. Incorrect object recycling and reuse during the HTTP/2 processing of asynchronous servlets can cause requests and responses to be mixed up between different users. A remote attacker could exploit this vul…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N","cvssSource":"vendor","cwe":"CWE-488","vendor":"Red Hat","product":"Red Hat Hardened Images","affected":["hardened_images"],"patched":["hardened_images"],"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T23:30:37+00:00","source":"CSAF","sourceUrl":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101356.json","references":[{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-101356.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-101356"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2556186"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-101356"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-101356"},{"url":"https://lists.apache.org/thread.html/d1xjt7bbjqw7y7n5mcb4fm815hpfgc27"},{"url":"https://access.redhat.com/errata/RHSA-2026:85926"},{"url":"https://access.redhat.com/errata/RHSA-2026:81365"}],"tags":["csaf","vex","red-hat","cve.org","score-dispute"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-20T18:17:35.437643Z"},"scores":{"vendor":5.3,"adp":9.1},"ingestedAt":"2026-10-20T14:08:00.569Z","epss":0.00499,"epssPercentile":0.42548,"slug":"CVE-2026-101356","body":"## Overview\n\nA flaw was found in Apache Tomcat. Incorrect object recycling and reuse during the HTTP/2 processing of asynchronous servlets can cause requests and responses to be mixed up between different users. A remote attacker could exploit this vulnerability to trigger unintended data cross-over, potentially leading to information disclosure.\n\n## Vendor advisories\n\n- **RHSA-2026:85926** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:85926)\n- **RHSA-2026:81365** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-12 · [advisory](https://access.redhat.com/errata/RHSA-2026:81365)\n\n**tomcat: tomcat: Information disclosure via incorrect object recycling in HTTP/2 processing** — rated Moderate by Red Hat. Released 2026-10-20.\n\nFixed:\n\n- Red Hat Hardened Images\n\n## Remediation\n\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:85926\nFor details on how to apply this update, which includes the changes described in this advisory, refer to:\nhttps://images.redhat.com/ https://access.redhat.com/errata/RHSA-2026:81365","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":227163,"id":"CVE-2026-101356","ts":1792585173777,"field":"cvss","old":"9.1","new":"5.3"},{"seq":227162,"id":"CVE-2026-101356","ts":1792585173777,"field":"severity","old":"critical","new":"medium"},{"seq":226088,"id":"CVE-2026-101356","ts":1792523855215,"field":"cvss","old":null,"new":"9.1"},{"seq":226087,"id":"CVE-2026-101356","ts":1792523855215,"field":"severity","old":"none","new":"critical"}]}