CVE-2026-111814

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{"bugzilla": {"description": "trafficserver: Apache Traffic Server: Default server_session_sharing.match omits MASK_CERT, allowing pooled mTLS identity confusion at the origin", "id": "2558490", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2558490"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.4", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N", "status": "draft"}, "cwe": "CWE-1188", "details": ["Apache Traffic Server's default outbound session-sharing policy can reuse a pooled TLS session authenticated with one client certificate for a transaction configured to present a different one.\nThis issue affects Apache Traffic Server: from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.\nUsers are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.", "A flaw was found in Apache Traffic Server. Its default outbound session-sharing policy can reuse an existing Transport Layer Security (TLS) connection authenticated with one client certificate for a transaction configured to present a different certificate. A remote attacker could exploit this flaw to bypass mutual TLS authentication without valid credentials, potentially gaining unauthorized access across tenant boundaries."], "name": "CVE-2026-111814", "public_date": "2026-10-21T19:13:06Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-111814\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-111814\nhttps://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc"], "statement": "This vulnerability is rated as Important because reusing established mutual TLS sessions across different client credentials allows unauthorized identity spoofing and upstream access control bypass. Apache Traffic Server is not provided in Red Hat Enterprise Linux or core Red Hat application distributions, limiting exposure across supported platforms. The flaw only impacts environments configured to route traffic to origin servers using multiple client certificates while retaining default connection pooling settings.", "threat_severity": "Important"}

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