{"id":"USN-8678-3","summary":"openssl vulnerability","details":"USN-8673-1 fixed vulnerabilities in OpenSSL. The update inadvertently left\nout the fix for CVE-2026-75803 in Ubuntu 26.04 LTS. This update fixes the\nproblem.\n\nWe apologize for the inconvenience.\n\nOriginal advisory details:\n\n It was discovered that OpenSSL incorrectly handled the QUIC server incoming\n channel queue. A remote attacker could possibly use this issue to cause\n OpenSSL to use excessive resources, leading to a denial of service. This\n issue only affected Ubuntu 26.04 LTS. (CVE-2026-14456)\n\n It was discovered that OpenSSL incorrectly handled signature algorithm\n selection when using Raw Public Keys. A remote attacker could possibly use\n this issue to cause OpenSSL to crash, resulting in a denial of service.\n This issue only affected Ubuntu 26.04 LTS. (CVE-2026-14457)\n\n It was discovered that OpenSSL incorrectly handled QUIC INITIAL packet\n processing. A remote attacker could possibly use this issue to cause\n OpenSSL to crash, resulting in a denial of service. This issue only\n affected Ubuntu 26.04 LTS. (CVE-2026-18798)\n\n It was discovered that OpenSSL incorrectly handled buffering of DTLS\n records for a future epoch. A remote attacker could possibly use this issue\n to cause OpenSSL to use excessive resources, leading to a denial of\n service. (CVE-2026-54874)\n\n It was discovered that OpenSSL incorrectly handled CMS key unwrapping. A\n remote attacker could possibly use this issue to cause a heap buffer\n overflow, leading to a denial of service or arbitrary code execution.\n (CVE-2026-63072)\n\n It was discovered that OpenSSL incorrectly validated the sender\n distinguished name in CMP response messages. A remote attacker could\n possibly use this issue to cause OpenSSL to crash, resulting in a denial of\n service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-63073)\n\n It was discovered that OpenSSL incorrectly limited the growth of an\n internal certificate cache used during CMP operations. A remote attacker\n could possibly use this issue to cause OpenSSL to use excessive resources,\n leading to a denial of service. (CVE-2026-63074)\n\n It was discovered that OpenSSL incorrectly handled QUIC ACK-only packet\n retention. A remote attacker could possibly use this issue to cause OpenSSL\n to use excessive resources, leading to a denial of service. This issue only\n affected Ubuntu 26.04 LTS. (CVE-2026-63075)\n\n It was discovered that OpenSSL incorrectly handled CMP protection algorithm\n validation. A remote attacker could possibly use this issue to cause\n OpenSSL to crash, resulting in a denial of service. (CVE-2026-63076)\n\n It was discovered that OpenSSL incorrectly verified authentication tags\n when using certain AEAD ciphers via the EVP_Cipher() interface. An attacker\n could possibly use this issue to perform AEAD forgery attacks.\n (CVE-2026-75803)","modified":"2026-09-03T16:02:00.580201786Z","published":"2026-08-31T12:18:40Z","related":["UBUNTU-CVE-2026-75803"],"upstream":["CVE-2026-75803","UBUNTU-CVE-2026-75803"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8678-3"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-75803"}],"affected":[{"package":{"name":"openssl","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/openssl?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.5.5-1ubuntu3.5"}]}],"versions":["3.5.3-1ubuntu2","3.5.5-1ubuntu1","3.5.5-1ubuntu3","3.5.5-1ubuntu3.2","3.5.5-1ubuntu3.3","3.5.5-1ubuntu3.4"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_version":"3.5.5-1ubuntu3.5","binary_name":"libssl3t64"},{"binary_name":"openssl","binary_version":"3.5.5-1ubuntu3.5"},{"binary_version":"3.5.5-1ubuntu3.5","binary_name":"openssl-provider-legacy"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8678-3.json","cves_map":{"ecosystem":"Ubuntu:26.04:LTS","cves":[{"id":"CVE-2026-75803","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"},{"score":"low","type":"Ubuntu"}]}]}}}],"schema_version":"1.9.0"}