CVE records

Every CVE as the CVE Program publishes it, refreshed every ten minutes, with NVD's analysis, CISA's known-exploited status and a healthcare tag. Subscribers get the CVEs that match their own systems on My program, by email as they are published. Where the data comes from: sources.

Updated under an hour ago (2026-10-19 05:50 UTC)

What this means for you

This week: 5,436 CVEs published, 357 critical, and 7 newly confirmed exploited. Add your stack to see whether any of them hit you.

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This week's critical CVEs

Exploited in the last 30 days

Published in the last 7 days: 5,436; Show in the list
Critical, last 7 days: 357; Show in the list
Healthcare-tagged, last 7 days: 4; Show in the list
Known exploited (CISA KEV): 1,747; Show in the list

Showing CVEs that name the product libssh2:libssh2. Show all products

22 CVEs, showing 1 to 22

CVE	Severity	Title	Published
CVE-2026-66035	High 7.5	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…	Jul 24, 2026
CVE-2026-66034	High 7.5	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…	Jul 24, 2026
CVE-2026-66033	High 7.5	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…	Jul 24, 2026
CVE-2026-66032	High 8.8	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 authentic…	Jul 24, 2026
CVE-2026-58051	Medium 6.5	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_p…	Jun 28, 2026
CVE-2026-58050	High 7.5	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 bo…	Jun 28, 2026
CVE-2025-15661	Medium 6.5	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…	Jun 18, 2026
CVE-2026-55200	High 8.3	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.	Jun 17, 2026
CVE-2026-55199	High 7.5	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 ca…	Jun 17, 2026
CVE-2026-7598	High 7.3	A security vulnerability has been detected in libssh2 up to 1.11.1.	May 1, 2026
CVE-2023-48795	Medium 5.9	The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remote attackers to bypass integrity checks such that some packets are omitted (from… Assigned by mitre	Dec 18, 2023
CVE-2020-22218	High 7.5	An issue was discovered in function _libssh2_packet_add in libssh2 1.10.0 allows attackers to access out of bounds memory. Assigned by mitre	Aug 22, 2023
CVE-2019-17498	High 8.1	In libssh2 v1.9.0 and earlier versions, the SSH_MSG_DISCONNECT logic in packet.c has an integer overflow in a bounds check, enabling an attacker to specify an arbitrary (out-of-bounds) offset for a s… Assigned by mitre	Oct 21, 2019
CVE-2019-3856	High 7.5	An integer overflow flaw, which could lead to an out of bounds write, was discovered in libssh2 before 1.8.1 in the way keyboard prompt requests are parsed. Assigned by redhat	Mar 25, 2019
CVE-2019-3857	High 7.5	An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit signal are parsed. Assigned by redhat	Mar 25, 2019
CVE-2019-3860	Medium 5.0	An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SFTP packets with empty payloads are parsed. Assigned by redhat	Mar 25, 2019
CVE-2019-3861	Medium 5.0	An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SSH packets with a padding length value greater than the packet length are parsed. Assigned by redhat	Mar 25, 2019
CVE-2019-3863	High 7.5	A flaw was found in libssh2 before 1.8.1 creating a vulnerability on the SSH client side. Assigned by redhat	Mar 25, 2019
CVE-2019-3858	Medium 5.0	An out of bounds read flaw was discovered in libssh2 before 1.8.1 when a specially crafted SFTP packet is received from the server. Assigned by redhat	Mar 21, 2019
CVE-2019-3855	High 7.5	An integer overflow flaw which could lead to an out of bounds write was discovered in libssh2 before 1.8.1 in the way packets are read from the server. Assigned by redhat	Mar 21, 2019
CVE-2019-3862	High 7.3	An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the way SSH_MSG_CHANNEL_REQUEST packets with an exit status message and no payload are parsed. Assigned by redhat	Mar 20, 2019
CVE-2019-3859	Medium 5.0	An out of bounds read flaw was discovered in libssh2 before 1.8.1 in the _libssh2_packet_require and _libssh2_packet_requirev functions. Assigned by redhat	Mar 20, 2019

CVSS is the assigning CNA's score where it gives one, otherwise NVD's. The healthcare tag is a documented heuristic (a list of clinical and health IT vendors, and clinical terms in the description), not a classification. The CVE record is authoritative.