# Libssh2 vulnerabilities

Source: https://junglewise.ai/threats/vendors/libssh2  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Updated: 9 November 2026, 03:07 UTC. Rebuilt every hour.  
Data: https://junglewise.ai/threats/vendors/libssh2.json  
License: CC BY 4.0 with a link back

Junglewise Threat Intelligence has tracked 11 vulnerabilities in Libssh2: 0 in the last 7 days and 0 in the last 90 days, 0 of them critical and 0 exploited in the wild. The most recent, CVE-2026-66035, was published on 24 July 2026. 1 technology has a page of its own.

## Counts

- Last 7 days: 0
- Last 30 days: 0
- Last 90 days: 0
- All time: 11 (0 critical, 0 exploited in the wild)

## About Libssh2

A software project providing a C library for the SSH2 protocol.

## Latest Libssh2 vulnerabilities

- [CVE-2026-66035: libssh2 heap buffer overflow in transport layer during EtM negotiation](https://junglewise.ai/threats/cve-2026-66035-libssh2-heap-buffer-overflow-in-transport-layer-during-etm) (high, CVSS 7.5, published 24 Jul 2026)
- [CVE-2026-66034: libssh2 heap out-of-bounds read in publickey_list_fetch](https://junglewise.ai/threats/cve-2026-66034-libssh2-heap-out-of-bounds-read-in-publickey-list-fetch) (high, CVSS 7.5, published 24 Jul 2026)
- [CVE-2026-66033: libssh2 integer underflow in ssh2_cipher_crypt](https://junglewise.ai/threats/cve-2026-66033-libssh2-integer-underflow-in-ssh2-cipher-crypt) (high, CVSS 7.5, published 24 Jul 2026)
- [CVE-2026-66032: libssh2 double free in sftp_open](https://junglewise.ai/threats/cve-2026-66032-libssh2-double-free-in-sftp-open) (high, CVSS 8.8, published 24 Jul 2026)
- [CVE-2026-58051: libssh2 uninitialized pointer free in publickey list cleanup](https://junglewise.ai/threats/cve-2026-58051-libssh2-uninitialized-pointer-free-in-publickey-list-cleanup) (medium, CVSS 6.5, published 28 Jun 2026)
- [CVE-2026-58050: libssh2 heap buffer overflow in publickey-subsystem attribute allocation](https://junglewise.ai/threats/cve-2026-58050-libssh2-heap-buffer-overflow-in-publickey-subsystem-attribute) (high, CVSS 7, published 28 Jun 2026)
- [CVE-2025-15661: libssh2 out-of-bounds heap read in sftp_symlink](https://junglewise.ai/threats/cve-2025-15661-libssh2-out-of-bounds-heap-read-in-sftp-symlink) (medium, CVSS 6.5, published 18 Jun 2026)
- [CVE-2026-55200: libssh2 out-of-bounds write in ssh2_transport_read](https://junglewise.ai/threats/cve-2026-55200-libssh2-out-of-bounds-write-in-ssh2-transport-read) (high, CVSS 8.1, published 17 Jun 2026)
- [CVE-2026-55199: libssh2 CPU exhaustion in SSH_MSG_EXT_INFO handler](https://junglewise.ai/threats/cve-2026-55199-libssh2-cpu-exhaustion-in-ssh-msg-ext-info-handler) (medium, CVSS 5.9, published 17 Jun 2026)
- [CVE-2026-7598: libssh2 integer overflow in userauth_password](https://junglewise.ai/threats/cve-2026-7598-libssh2-integer-overflow-in-userauth-password) (high, CVSS 7.3, published 1 May 2026)
- [CVE-2023-48795: OpenSSH and others SSH prefix truncation vulnerability (Terrapin)](https://junglewise.ai/threats/cve-2023-48795-openssh-and-others-ssh-prefix-truncation-vulnerability-terrapin) (medium, CVSS 5.9, published 18 Dec 2023)

## Most severe Libssh2 vulnerabilities

- [CVE-2026-66032: libssh2 double free in sftp_open](https://junglewise.ai/threats/cve-2026-66032-libssh2-double-free-in-sftp-open) (high, CVSS 8.8, published 24 Jul 2026)
- [CVE-2026-55200: libssh2 out-of-bounds write in ssh2_transport_read](https://junglewise.ai/threats/cve-2026-55200-libssh2-out-of-bounds-write-in-ssh2-transport-read) (high, CVSS 8.1, published 17 Jun 2026)
- [CVE-2026-66035: libssh2 heap buffer overflow in transport layer during EtM negotiation](https://junglewise.ai/threats/cve-2026-66035-libssh2-heap-buffer-overflow-in-transport-layer-during-etm) (high, CVSS 7.5, published 24 Jul 2026)
- [CVE-2026-66034: libssh2 heap out-of-bounds read in publickey_list_fetch](https://junglewise.ai/threats/cve-2026-66034-libssh2-heap-out-of-bounds-read-in-publickey-list-fetch) (high, CVSS 7.5, published 24 Jul 2026)
- [CVE-2026-66033: libssh2 integer underflow in ssh2_cipher_crypt](https://junglewise.ai/threats/cve-2026-66033-libssh2-integer-underflow-in-ssh2-cipher-crypt) (high, CVSS 7.5, published 24 Jul 2026)
- [CVE-2026-7598: libssh2 integer overflow in userauth_password](https://junglewise.ai/threats/cve-2026-7598-libssh2-integer-overflow-in-userauth-password) (high, CVSS 7.3, published 1 May 2026)
- [CVE-2026-58050: libssh2 heap buffer overflow in publickey-subsystem attribute allocation](https://junglewise.ai/threats/cve-2026-58050-libssh2-heap-buffer-overflow-in-publickey-subsystem-attribute) (high, CVSS 7, published 28 Jun 2026)
- [CVE-2026-58051: libssh2 uninitialized pointer free in publickey list cleanup](https://junglewise.ai/threats/cve-2026-58051-libssh2-uninitialized-pointer-free-in-publickey-list-cleanup) (medium, CVSS 6.5, published 28 Jun 2026)
- [CVE-2025-15661: libssh2 out-of-bounds heap read in sftp_symlink](https://junglewise.ai/threats/cve-2025-15661-libssh2-out-of-bounds-heap-read-in-sftp-symlink) (medium, CVSS 6.5, published 18 Jun 2026)
- [CVE-2023-48795: OpenSSH and others SSH prefix truncation vulnerability (Terrapin)](https://junglewise.ai/threats/cve-2023-48795-openssh-and-others-ssh-prefix-truncation-vulnerability-terrapin) (medium, CVSS 5.9, published 18 Dec 2023)

## Vulnerabilities per week

Nothing was published in the last eight weeks.

| Week of | Vulns | Critical | Exploited |
| --- | --- | --- | --- |
| 17 Aug 2026 | 0 | 0 | 0 |
| 24 Aug 2026 | 0 | 0 | 0 |
| 31 Aug 2026 | 0 | 0 | 0 |
| 7 Sep 2026 | 0 | 0 | 0 |
| 14 Sep 2026 | 0 | 0 | 0 |
| 21 Sep 2026 | 0 | 0 | 0 |
| 28 Sep 2026 | 0 | 0 | 0 |
| 5 Oct 2026 | 0 | 0 | 0 |
| 12 Oct 2026 | 0 | 0 | 0 |
| 19 Oct 2026 | 0 | 0 | 0 |
| 26 Oct 2026 | 0 | 0 | 0 |
| 2 Nov 2026 | 0 | 0 | 0 |
| 9 Nov 2026 | 0 | 0 | 0 |

## Libssh2 technologies

- [Libssh2](https://junglewise.ai/threats/technologies/libssh2): 11 vulnerabilities

## Sources

NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories. Rebuilt every hour. Cite as: Junglewise Threat Intelligence, "Libssh2 vulnerabilities", https://junglewise.ai/threats/vendors/libssh2, 9 November 2026.