Packages
- libssh2 - Client-side C library implementing the SSH2 protocol
Details
It was discovered that libssh2 incorrectly handled certain SFTP server
responses. A remote attacker controlling an SSH server could use this issue
to cause libssh2 to crash or possibly execute arbitrary code.
(CVE-2026-66032)
It was discovered that libssh2 incorrectly handled AES-GCM cipher
negotiation. A remote attacker controlling an SSH server could possibly use
this issue to cause libssh2 to crash, resulting in a denial of service.
(CVE-2026-66033)
It was discovered that libssh2 incorrectly handled Encrypt-then-MAC cipher
negotiation. A remote attacker controlling an SSH server could use this
issue to cause libssh2 to crash or possibly execute arbitrary code.
(CVE-2026-66035)
It was discovered that libssh2 incorrectly handled certain SFTP server
responses. A remote attacker controlling an SSH server could use this issue
to cause libssh2 to crash or possibly execute arbitrary code.
(CVE-2026-66032)
It was discovered that libssh2 incorrectly handled AES-GCM cipher
negotiation. A remote attacker controlling an SSH server could possibly use
this issue to cause libssh2 to crash, resulting in a denial of service.
(CVE-2026-66033)
It was discovered that libssh2 incorrectly handled Encrypt-then-MAC cipher
negotiation. A remote attacker controlling an SSH server could use this
issue to cause libssh2 to crash or possibly execute arbitrary code.
(CVE-2026-66035)
Update instructions
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 26.04 LTS resolute | libssh2-1t64 – 1.11.1-1ubuntu0.26.04.4 | ||
| 24.04 LTS noble | libssh2-1t64 – 1.11.0-4.1ubuntu0.24.04.4 | ||
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