CVE-2026-3731

A weakness has been identified in libssh up to 0.11.3. The impacted element is the function sftpextensionsgetname/sftpextensionsgetdata of the file src/sftp.c of the component SFTP Extension Name Handler. Executing a manipulation of the argument idx can lead to out-of-bounds read. The attack may be performed from remote. Upgrading to version 0.11.4 and 0.12.0 is sufficient to resolve this issue. This patch is called 855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60. You should upgrade the affected component.

References

Affected packages

Git / gitlab.com/libssh/libssh-mirror

Affected ranges

Type

GIT

Repo

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

Events

Introduced

Last affected

301d0e16dfa8a5cac1cff956b6880ca90eb82864

Fixed

855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60

Database specific

{
    "versions": [
        {
            "introduced": "0"
        },
        {
            "last_affected": "0.11.3"
        }
    ]
}

Affected versions

libssh-0.*

libssh-0.11.0

libssh-0.11.1

libssh-0.11.2

libssh-0.11.3

libssh-0.8.0

Other

release-0-3-0

Database specific

vanir_signatures

[
    {
        "digest": {
            "function_hash": "24448468969138265884785329107942446000",
            "length": 341.0
        },
        "id": "CVE-2026-3731-254bef34",
        "signature_type": "Function",
        "source": "https://gitlab.com/libssh/libssh-mirror@855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60",
        "deprecated": false,
        "target": {
            "function": "sftp_extensions_get_data",
            "file": "src/sftp.c"
        },
        "signature_version": "v1"
    },
    {
        "digest": {
            "function_hash": "202487601221476550103335908013974753101",
            "length": 341.0
        },
        "id": "CVE-2026-3731-6aeb4341",
        "signature_type": "Function",
        "source": "https://gitlab.com/libssh/libssh-mirror@855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60",
        "deprecated": false,
        "target": {
            "function": "sftp_extensions_get_name",
            "file": "src/sftp.c"
        },
        "signature_version": "v1"
    },
    {
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "45869386280972937582204502160812282977",
                "75140046862169441082434852326701470484",
                "151682577421623218729386355289173953547",
                "295959248680867526462238789964720241899",
                "45869386280972937582204502160812282977",
                "75140046862169441082434852326701470484",
                "151682577421623218729386355289173953547",
                "295959248680867526462238789964720241899"
            ]
        },
        "id": "CVE-2026-3731-844a70da",
        "source": "https://gitlab.com/libssh/libssh-mirror@855a0853ad3abd4a6cd85ce06fce6d8d4c7a0b60",
        "signature_type": "Line",
        "deprecated": false,
        "target": {
            "file": "src/sftp.c"
        },
        "signature_version": "v1"
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-3731.json"

vanir_signatures_modified

"2026-04-15T14:02:25Z"