An update for libssh2 is now available for openEuler-22.03-LTS-SP4 Security Advisory openeuler-security@openeuler.org openEuler security committee openEuler-SA-2026-3394 Final 1.0 1.0 2026-08-13 Initial 2026-08-13 2026-08-13 openEuler SA Tool V1.0 2026-08-13 libssh2 security update An update for libssh2 is now available for openEuler-22.03-LTS-SP4 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). Security Fix(es): libssh2 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) libssh2 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) libssh2 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) An update for libssh2 is now available for openEuler-22.03-LTS-SP4. openEuler Security has rated this update as having a security impact of high. A Common Vunlnerability Scoring System(CVSS)base score,which gives a detailed severity rating, is available for each vulnerability from the CVElink(s) in the References section. High libssh2 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3394 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-58050 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-66032 https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2026-66034 https://nvd.nist.gov/vuln/detail/CVE-2026-58050 https://nvd.nist.gov/vuln/detail/CVE-2026-66032 https://nvd.nist.gov/vuln/detail/CVE-2026-66034 openEuler-22.03-LTS-SP4 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 libssh2-help-1.10.0-13.oe2203sp4.noarch.rpm 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 libssh2-1.10.0-13.oe2203sp4.src.rpm libssh2 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. 2026-08-13 CVE-2026-58050 openEuler-22.03-LTS-SP4 High 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H libssh2 security update 2026-08-13 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3394 libssh2 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. 2026-08-13 CVE-2026-66032 openEuler-22.03-LTS-SP4 High 8.8 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H libssh2 security update 2026-08-13 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3394 libssh2 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. 2026-08-13 CVE-2026-66034 openEuler-22.03-LTS-SP4 High 7.5 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H libssh2 security update 2026-08-13 https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-3394