1309 matches found
CVE-2026-66032
libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftpopen 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 SSHFXPOPEN with SSHFXPSTATUS containin...
CVE-2026-66032: Double Free
libssh2 through 1.11.1, fixed in commit 5e47761, contains a double-free vulnerability in the sftpopen 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 SSHFXPOPEN with SSHFXPSTATUS containin...
PT-2026-64380
Name of the Vulnerable Software and Affected Versions libssh2 versions prior to 1.11.1 Description A pre-authentication integer underflow exists in the ssh2 cipher crypt function within src/openssl.c. A malicious SSH server can trigger this issue during the handshake by negotiating AES-GCM cipher...
CVE-2026-66035: Heap-based Buffer Overflow
libssh2 through 1.11.1, fixed in commit 42e33d8, contains a pre-authentication heap buffer overflow vulnerability that allows a malicious SSH server to corrupt heap metadata in any connecting client by sending a packet with a packetlength smaller than the cipher's block size during Encrypt-then-M...
CVE-2026-66033: Integer Underflow (Wrap or Wraparound)
libssh2 through 1.11.1, fixed in commit a2ed82d, contains a pre-authentication integer underflow vulnerability in the ssh2ciphercrypt function in src/openssl.c that allows a malicious SSH server to crash any connecting client by negotiating AES-GCM ciphers during handshake. Attackers can exploit...
CVE-2026-66034: Out-of-bounds Read
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 libssh2publickeylistfetch, the version 1...
PT-2026-64379
Name of the Vulnerable Software and Affected Versions libssh2 versions prior to 1.11.1 Description A double-free issue exists in the sftp open function within src/sftp.c. This occurs when a malicious SSH server responds to SSH FXP OPEN with SSH FXP STATUS containing FX OK, causing the response da...
PT-2026-64382
Name of the Vulnerable Software and Affected Versions libssh2 versions prior to 1.11.1 Description A pre-authentication heap buffer overflow occurs during Encrypt-then-MAC ETM cipher negotiation. A malicious SSH server can corrupt heap metadata in a connecting client by sending a packet where the...
libssh2:ssh2_client_fuzzer: Null-dereference READ in kex_diffie_hellman_sha
Project: https://github.com/cmeister2/libssh2.git https://github.com/libssh2/libssh2.git Detailed Report: https://oss-fuzz.com/testcase?key=4528762809810944 Project: libssh2 Fuzzing Engine: afl Fuzz Target: ssh2clientfuzzer Job Type: aflasanlibssh2 Platform Id: linux Crash Type: Null-dereference...
EulerOS Virtualization 2.10.0 : libssh2 (EulerOS-SA-2026-2858)
According to the versions of the libssh2 package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauthpassword of the fi...
Amazon Linux 2 : libssh2, --advisory ALAS2-2026-3813 (ALAS-2026-3813)
The version of libssh2 installed on the remote host is prior to 1.4.3-12. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2026-3813 advisory. libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses i...
EulerOS Virtualization 2.12.1 (EulerOS-SA-2026-2737)
According to the versions of the package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauthpassword of the file...
EulerOS Virtualization 2.12.0 : libssh2 (EulerOS-SA-2026-2783)
According to the versions of the libssh2 package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauthpassword of the fi...
Important: libssh2
Issue Overview: libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation numattrs sizeoflibssh2publickeyattribute without bounds checking, so on 32-bit platforms the multiplication overflows to an undersized buffe...
Amazon Linux 2023 : libssh2, libssh2-devel (ALAS2023-2026-1966)
It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1966 advisory. libssh2 through 1.11.1 reads an attacker-controlled 32-bit attribute count from a publickey-subsystem response and uses it in the allocation numattrs sizeoflibssh2publickeyattribute without...
OESA-2026-3017 libssh2 security update
libssh2 is a library implementing the SSH2 protocol as defined by Internet Drafts: SECSH-TRANS22, SECSH-USERAUTH25, SECSH-CONNECTION23, SECSH-ARCH20, SECSH-FILEXFER06, SECSH-DHGEX04, and SECSH-NUMBERS10. Security Fixes: libssh2 through 1.11.1, fixed in commit 2dae302, contains an out-of-bounds he...
OESA-2026-3014 libssh2 security update
libssh2 is a library implementing the SSH2 protocol as defined by Internet Drafts: SECSH-TRANS22, SECSH-USERAUTH25, SECSH-CONNECTION23, SECSH-ARCH20, SECSH-FILEXFER06, SECSH-DHGEX04, and SECSH-NUMBERS10. Security Fixes: libssh2 through 1.11.1, fixed in commit 2dae302, contains an out-of-bounds he...
SUSE SLES15 Security Update : libssh2_org (SUSE-SU-2026:3074-1)
The remote SUSE Linux SLES15 / SLESSAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:3074-1 advisory. This update for libssh2org fixes the following issue Security changes: - CVE-2026-55199: pre-Authentication DoS via SSHMSGEXTINFO Handler...
Security update for libssh2_org
This update for libssh2org fixes the following issue CVE-2026-55199: pre-Authentication DoS via SSHMSGEXTINFO Handler bsc1268530. Patch Instructions: To install this SUSE update use the SUSE recommended installation methods like YaST onlineupdate or "zypper patch". Alternatively you can run the...