Multiple vulnerabilities in CRaC JDK 21, primarily involving insufficient API authentication across components (JAXP, Networking, JSSE, JGSS, Libraries, Security), allow remote unauthenticated attackers to cause denial of service or information disclosure, while a local attacker can also leak sensitive information; one integer handling flaw in the 2D component could lead to information leakage via a crafted file. Based on NVD data, CVSS scores range from 5.3 (MEDIUM) to 7.5 (HIGH) for specific CVEs. Affected Oracle JRE versions include 1.8.0, 11.0.30, 17.0.18, 21.0.10, and 25.0.2, depending on the specific CVE.
Thomas Beckers discovered that the JAXP component of CRaC JDK 21 did not correctly authenticate certain APIs. A remote unauthenticated attacker could possibly use this issue to gain unauthorized access to sensitive information. (CVE-2026-22016) It was discovered that the Networking component of CRaC JDK 21 did not correctly authenticate certain APIs. A remote unauthenticated attacker could possibly use this issue to cause a denial of service. (CVE-2026-34282) It was discovered that the JSSE component of CRaC JDK 21 did not correctly authenticate certain APIs. A remote unauthenticated attacker could possibly use this issue to cause a denial of service. (CVE-2026-22021) It was discovered that the JGSS component of CRaC JDK 21 did not correctly authenticate certain APIs. A remote attacker could possibly use this issue to obtain sensitive information.(CVE-2026-22013) It was discovered that the 2D component of CRaC JDK 21 did not correctly handle certain integer arithmetic. If a user or automated system were tricked into opening a specially crafted file, an attacker could possibly use this issue to leak sensitive information. (CVE-2026-23865) It was discovered that the Libraries component of CRaC JDK 21 did not correctly authenticate certain APIs. A remote unauthenticated attacker could possibly use this issue to cause a denial of service. (CVE-2026-22018) Ken Pyle discovered that the Security component of CRaC JDK 21 did not correctly authenticate certain APIs. A local attacker could possibly use this issue to leak sensitive information. (CVE-2026-22007, CVE-2026-34268) In addition to security fixes, the updated packages contain bug fixes, new features, and possibly incompatible changes. Please see the following for more information: https://openjdk.org/groups/vulnerability/advisories/2026-04-21