libssh2: libssh2 1.11.1, fixed in commit 97acf3d, contains an out-of-bounds write vulnerability in ssh2_transport_read() that...
CVE-2026-55200 is fixed in 7 products on 1 platform, first by libssh2-1t64 1.11.1-1ubuntu0.26.04.2, released June 18, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libssh2 · Debian 13.5 (trixie) | 1.11.1-1+deb13u1 | DEBIAN-CVE-2026-55200 | Jun 26, 2026 |
| libssh2 · Debian 14 | 1.11.1-4 | DEBIAN-CVE-2026-55200 | Jun 26, 2026 |
| libssh2 · Fedora 43 | 1.11.1-9.fc43 | FEDORA-2026-EED9E67393 | Jun 24, 2026 |
| libssh2-1t64 · Ubuntu 25.10 (questing) | 1.11.1-1ubuntu0.25.10.2 | libssh2-1t64 1.11.1-1ubuntu0.25.10.2 | Jul 3, 2026 |
| libssh2-1t64 · Ubuntu 26.04.1 LTS (resolute) | 1.11.1-1ubuntu0.26.04.2 | libssh2-1t64 1.11.1-1ubuntu0.26.04.2 | Jun 18, 2026 |
| libssh2-debuginfo · Fedora 43 | 1.11.1-9.fc43 | FEDORA-2026-EED9E67393 | Jun 24, 2026 |
| libssh2-debugsource · Fedora 43 | 1.11.1-9.fc43 | FEDORA-2026-EED9E67393 | Jun 24, 2026 |
| libssh2-devel · Fedora 43 | 1.11.1-9.fc43 | FEDORA-2026-EED9E67393 | Jun 24, 2026 |
| libssh2-docs · Fedora 43 | 1.11.1-9.fc43 | FEDORA-2026-EED9E67393 | Jun 24, 2026 |
| libssh2_org · opensuse-leap 16.0 | 1.11.1-160000.4.1 | OPENSUSE-SU-2026:21057-1 | Jun 25, 2026 |
| libssh2_org · sles 16.0 | 1.11.1-160000.4.1 | SUSE-SU-2026:22364-1 | Jun 25, 2026 |
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