Description
There's a vulnerability in the libssh package where when a libssh consumer passes in an unexpectedly large input buffer to ssh_get_fingerprint_hash() function. In such cases the bin_to_base64() function can experience an integer overflow leading to a memory under allocation, when that happens it's possible that the program perform out of bounds write leading to a heap corruption. This issue affects only 32-bits builds of libssh.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
libssh
Default version status: unaffected
0 to < 0.11.2affected
Red Hat Red Hat Enterprise Linux 9
Default version status: affected
0:0.10.4-18.el9 to < *unaffected
Red Hat Red Hat Enterprise Linux 9
Default version status: affected
0:0.10.4-18.el9 to < *unaffected
Red Hat Red Hat Enterprise Linux 10
Default version status: unaffected
Red Hat Red Hat Enterprise Linux 6
Default version status: unaffected
Red Hat Red Hat Enterprise Linux 7
Default version status: unaffected
Red Hat Red Hat Enterprise Linux 8
Default version status: unaffected
Red Hat Red Hat OpenShift Container Platform 4
Default version status: unaffected
Red Hat Red Hat OpenShift Container Platform 4
Default version status: unaffected
References
- https://access.redhat.com/errata/RHSA-2026:18683 ↗
- https://access.redhat.com/security/cve/CVE-2025-4877 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2376193 ↗
- https://git.libssh.org/projects/libssh.git/commit/?h=stable-0.11&id=6fd9cc8ce3958092a1aae11f1f2e911b2747732d ↗
- https://www.libssh.org/security/advisories/CVE-2025-4877.txt ↗