{"schema_version":"1.7.2","id":"OESA-2026-3222","modified":"2026-08-06T11:12:05Z","published":"2026-08-01T11:12:05Z","upstream":["CVE-2026-55199"],"summary":"libssh2 security update","details":"libssh2 is a library implementing the SSH2 protocol as defined by Internet Drafts: SECSH-TRANS(22), SECSH-USERAUTH(25), SECSH-CONNECTION(23), SECSH-ARCH(20), SECSH-FILEXFER(06)*, SECSH-DHGEX(04), and SECSH-NUMBERS(10).\r\n\r\nSecurity Fix(es):\n\nlibssh2 through 1.11.1, fixed in commit 1762685, contains a pre-authentication denial of service vulnerability in the SSH_MSG_EXT_INFO handler in src/packet.c that allows a malicious SSH server to cause a client CPU exhaustion loop by sending a crafted extension count value. A malicious server can set nr_extensions to 0xFFFFFFFF during key exchange, causing the client to spin in a tight CPU loop for over 60 seconds because return values from _libssh2_get_string() are unchecked and the session timeout does not apply to CPU-bound loops.(CVE-2026-55199)","affected":[{"package":{"ecosystem":"openEuler:24.03-LTS-SP4","name":"libssh2","purl":"pkg:rpm/openEuler/libssh2&distro=openEuler-24.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.11.0-8.oe2403sp4"}]}],"ecosystem_specific":{"aarch64":["libssh2-1.11.0-8.oe2403sp4.aarch64.rpm","libssh2-debuginfo-1.11.0-8.oe2403sp4.aarch64.rpm","libssh2-debugsource-1.11.0-8.oe2403sp4.aarch64.rpm","libssh2-devel-1.11.0-8.oe2403sp4.aarch64.rpm"],"noarch":["libssh2-help-1.11.0-8.oe2403sp4.noarch.rpm"],"src":["libssh2-1.11.0-8.oe2403sp4.src.rpm"],"x86_64":["libssh2-1.11.0-8.oe2403sp4.x86_64.rpm","libssh2-debuginfo-1.11.0-8.oe2403sp4.x86_64.rpm","libssh2-debugsource-1.11.0-8.oe2403sp4.x86_64.rpm","libssh2-devel-1.11.0-8.oe2403sp4.x86_64.rpm"]}}],"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3222"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55199"}],"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}],"database_specific":{"severity":"High"}}