RHSA-2026:61752 - Security Advisory

Topic

An update for libssh2 is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The libssh2 packages provide a library that implements the SSH2 protocol.

Security Fix(es):

• libssh2: integer overflow via large username or password arguments (CVE-2026-7598)
• libssh2: libssh2: Heap buffer overflow via integer overflow in publickey attribute allocation (CVE-2026-58050)
• libssh2: libssh2: Arbitrary code execution via double-free in SFTP session (CVE-2026-66032)
• libssh2: libssh2: Information disclosure and potential arbitrary code execution via heap out-of-bounds read (CVE-2026-66034)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux Server - Extended Life Cycle Support 7 x86_64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support (for IBM z Systems) 7 s390x
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, big endian 7 ppc64
• Red Hat Enterprise Linux Server - Extended Life Cycle Support for IBM Power, little endian 7 ppc64le

Fixes

• BZ - 2464597 - CVE-2026-7598 libssh2: integer overflow via large username or password arguments
• BZ - 2493955 - CVE-2026-58050 libssh2: libssh2: Heap buffer overflow via integer overflow in publickey attribute allocation
• BZ - 2506857 - CVE-2026-66032 libssh2: libssh2: Arbitrary code execution via double-free in SFTP session
• BZ - 2506860 - CVE-2026-66034 libssh2: libssh2: Information disclosure and potential arbitrary code execution via heap out-of-bounds read

CVEs

• CVE-2026-7598
• CVE-2026-58050
• CVE-2026-66032
• CVE-2026-66034

References

• https://access.redhat.com/security/updates/classification/#important