CVE-2026-59842

A flaw was found in libssh. During server-side GSSAPI key exchange, a client-supplied Curve25519 public key shorter than the expected length is copied without proper length validation, leading to an out-of-bounds heap read. This could allow a remote unauthenticated attacker to disclose small amounts of server memory.

Database specific

{
    "cna_assigner":  "redhat",
    "cwe_ids":  [
        "CWE-125"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/59xxx/CVE-2026-59842.json",
    "unresolved_ranges":  [
        {
            "extracted_events":  [
                {
                    "range":  [
                        {
                            "fixed":  "0:0.12.0-3.el10_2"
                        },
                        {
                            "fixed":  "0.12.1-4.hum1"
                        }
                    ],
                    "source":  "AFFECTED_FIELD",
                    "strategy":  "InverseAffectedRanges"
                }
            ]
        }
    ]
}

References

Affected packages

Git / gitlab.com/libssh/libssh-mirror

Affected ranges

Type

GIT

Repo

https://gitlab.com/libssh/libssh-mirror

Events

Introduced

50313883f3a077458cde4ea95bf46bfeb0771b34

Last Affected

50313883f3a077458cde4ea95bf46bfeb0771b34

Database specific

Show details

{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:libssh:libssh:0.12.0:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0.12.0"
                },
                {
                    "last_affected":  "0.12.0"
                }
            ],
            "source":  "CPE_STRING"
        }
    ]
}

Affected versions

0.*

0.12.0

libssh-0.*

libssh-0.12.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-59842.json"