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CVE-2026-66035

Medium priority
Needs evaluation

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...

1 affected package

libssh2

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libssh2 Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-66034

Medium priority
Needs evaluation

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...

1 affected package

libssh2

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libssh2 Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-66033

Medium priority
Needs evaluation

libssh2 through 1.11.1, fixed in commit a2ed82d, contains a pre-authentication integer underflow vulnerability in the ssh2_cipher_crypt() function in src/openssl.c that allows a malicious SSH server to crash any connecting client...

1 affected package

libssh2

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libssh2 Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-66032

Medium priority
Needs evaluation

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...

1 affected package

libssh2

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libssh2 Needs evaluation Needs evaluation Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-58051

Medium priority

Some fixes available 2 of 7

libssh2 through 1.11.1 grows its publickey list with SSH2_REALLOC but does not zero-initialize new entries before parsing populates them, so a parse failure reaching the cleanup path leaves libssh2_publickey_list_free operating on...

1 affected package

libssh2

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libssh2 Fixed Fixed Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-58050

Medium priority

Some fixes available 2 of 7

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...

1 affected package

libssh2

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libssh2 Fixed Fixed Needs evaluation Needs evaluation Needs evaluation
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CVE-2025-15661

Medium priority

Some fixes available 3 of 7

libssh2 through 1.11.1, fixed in commit 2dae302, contains an out-of-bounds heap read vulnerability in the sftp_symlink() function in src/sftp.c that allows a malicious SSH server or man-in-the-middle attacker to disclose heap...

1 affected package

libssh2

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libssh2 Fixed Fixed Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-55200

Medium priority
Fixed

libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with...

1 affected package

libssh2

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libssh2 Fixed Not affected Not affected Not affected Not affected
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CVE-2026-55199

Medium priority

Some fixes available 3 of 7

libssh2 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...

1 affected package

libssh2

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libssh2 Fixed Fixed Needs evaluation Needs evaluation Needs evaluation
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CVE-2026-7598

Medium priority

Some fixes available 3 of 8

A security vulnerability has been detected in libssh2 up to 1.11.1. The impacted element is the function userauth_password of the file src/userauth.c. Such manipulation of the argument username_len/password_len leads to integer...

1 affected package

libssh2

Package 26.04 LTS 24.04 LTS 22.04 LTS 20.04 LTS 18.04 LTS
libssh2 Fixed Fixed Needs evaluation Needs evaluation Needs evaluation
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