{"schema_version":"1.7.2","id":"OESA-2026-3394","modified":"2026-08-13T14:02:39Z","published":"2026-08-13T14:02:39Z","upstream":["CVE-2026-58050","CVE-2026-66032","CVE-2026-66034"],"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 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation num_attrs * sizeof(libssh2_publickey_attribute) without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffer. A malicious SSH server can then drive the attribute-parsing loop to write past the allocation, causing a heap buffer overflow in a connecting libssh2 client.(CVE-2026-58050)\n\nlibssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftp_open() function in src/sftp.c that allows a malicious SSH server to corrupt the heap of any authenticated client opening an SFTP session. When a server responds to SSH_FXP_OPEN with SSH_FXP_STATUS containing FX_OK, the response data buffer is freed, and if a subsequent sftp_packet_require() call returns a specific error such as LIBSSH2_ERROR_CHANNEL_PACKET_EXCEEDED, the same pointer is freed a second time, enabling tcache dup conditions on glibc systems that allow overlapping allocations and function pointer overwrites.(CVE-2026-66032)\n\nlibssh2 through 1.11.1, fixed in commit a13bb6c, contains a missing bounds check vulnerability that allows a malicious SSH server to trigger an arbitrary-length heap out-of-bounds read and a free of an uninitialized pointer via the publickey subsystem. In libssh2_publickey_list_fetch(), the version 1 response parser reads a server-controlled comment_len value and advances the parse pointer without verifying sufficient bytes remain in the buffer, causing the out-of-bounds read to leak heap pointers from adjacent allocations defeating ASLR, followed by heap allocator state corruption when the error cleanup path frees an uninitialized pointer from a non-zeroed realloc() region.(CVE-2026-66034)","affected":[{"package":{"ecosystem":"openEuler:22.03-LTS-SP4","name":"libssh2","purl":"pkg:rpm/openEuler/libssh2&distro=openEuler-22.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.0-13.oe2203sp4"}]}],"ecosystem_specific":{"aarch64":["libssh2-1.10.0-13.oe2203sp4.aarch64.rpm","libssh2-debuginfo-1.10.0-13.oe2203sp4.aarch64.rpm","libssh2-debugsource-1.10.0-13.oe2203sp4.aarch64.rpm","libssh2-devel-1.10.0-13.oe2203sp4.aarch64.rpm"],"noarch":["libssh2-help-1.10.0-13.oe2203sp4.noarch.rpm"],"src":["libssh2-1.10.0-13.oe2203sp4.src.rpm"],"x86_64":["libssh2-1.10.0-13.oe2203sp4.x86_64.rpm","libssh2-debuginfo-1.10.0-13.oe2203sp4.x86_64.rpm","libssh2-debugsource-1.10.0-13.oe2203sp4.x86_64.rpm","libssh2-devel-1.10.0-13.oe2203sp4.x86_64.rpm"]}}],"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3394"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-58050"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66032"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-66034"}],"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}],"database_specific":{"severity":"High"}}