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Ubuntu 26.04 24.04 libssh2 Critical DoS RCE Vulnerabilities USN-8532-1

ubuntu
Calendar Grey July 13, 2026
Dist Ubuntu Esm H88
Recent fixes for libssh2 address critical security issues in Ubuntu affecting remote code execution and denial of service.
Several security issues were fixed in libssh2.

Summary

Several security issues were fixed in libssh2.

Software Description:

- libssh2: Client-side C library implementing the SSH2 protocol

Details:

It was discovered that libssh2 incorrectly handled certain publickey

subsystem attributes. A remote attacker controlling a malicious SSH server

could use this issue to cause a denial of service or possibly execute

arbitrary code. (CVE-2026-58050)

It was discovered that libssh2 did not properly initialize publickey list

entries before parsing. A remote attacker controlling a malicious SSH

server could use this issue to cause a denial of service or possibly

execute arbitrary code. (CVE-2026-58051)

Topics%20covered

Topics Covered

security advisory denial of service critical remote code execution Ubuntu libssh2

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
  libssh2-1t64                    1.11.1-1ubuntu0.26.04.3

Ubuntu 24.04 LTS
  libssh2-1t64                    1.11.0-4.1ubuntu0.24.04.3

In general, a standard system update will make all the necessary
changes.

References

https://ubuntu.com/security/notices/USN-8532-1

CVE-2026-58050, CVE-2026-58051

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8532-1

Topics%20covered

Topics Covered

security advisory denial of service critical remote code execution Ubuntu libssh2

Package Information

https://launchpad.net/ubuntu/+source/libssh2/1.11.1-1ubuntu0.26.04.3
https://launchpad.net/ubuntu/+source/libssh2/1.11.0-4.1ubuntu0.24.04.3

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