CVE-2026-55200
Fixed in a distro release EPSS 4%CVSS 8.1
libssh2 1.11.1, fixed in commit 97acf3d, 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 excessively large packet_length values to corrupt heap memory and achieve remote code execution.
Products: libssh2
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.21 | libssh2 | 1.11.1-r2 |
| Alpine 3.22 | libssh2 | 1.11.1-r2 |
| Alpine 3.23 | libssh2 | 1.11.1-r3 |
| Alpine 3.24 | libssh2 | 1.11.1-r3 |
| Alpine 3.24 | rust | 1.96.1-r0 |
| Chainguard | libssh2 | 1.11.1-r6 |
| Chainguard | libssh2-dev | 1.11.1-r6 |
| Chainguard | libssh2-doc | 1.11.1-r6 |
| Debian 13 | libssh2 | 1.11.1-1+deb13u1 |
| Debian 14 | libssh2 | 1.11.1-4 |
| Red Hat hummingbird 1 | libssh2 | 0:1.11.1-8.hum1 |
| Red Hat hummingbird 1 | libssh2-devel | 0:1.11.1-8.hum1 |
| Red Hat hummingbird 1 | libssh2-docs | 0:1.11.1-8.hum1 |
| SUSE Linux Enterprise Server 16.0 | libssh2_org | 1.11.1-160000.4.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | libssh2_org | 1.11.1-160000.4.1 |
| SUSE Linux Micro 6.2 | libssh2_org | 1.11.1-160000.4.1 |
| Ubuntu 24.04 LTS | libssh2 | 1.11.0-4.1ubuntu0.24.04.2 |
| Ubuntu 25.10 | libssh2 | 1.11.1-1ubuntu0.25.10.2 |
| Ubuntu 26.04 LTS | libssh2 | 1.11.1-1ubuntu0.26.04.2 |
| Wolfi | libssh2 | 1.11.1-r6 |
| Wolfi | libssh2-dev | 1.11.1-r6 |
| Wolfi | libssh2-doc | 1.11.1-r6 |
| openSUSE Leap 16.0 | libssh2_org | 1.11.1-160000.4.1 |
| openSUSE Tumbleweed | libssh2_org | 1.11.1-3.1 |