CVE-2025-4877

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.

Red Hat Product Security classified this vulnerability as having a Moderate severity. This happens because of the complexity of the attack, the possible misusage of the libssh API and the fact the attacker may not have full control over the positions and contents written into the heap.

No supported Red Hat products are affected by this issue since only 32-bit builds are vulnerable.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.