CVE-2018-15856

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Source
https://cve.org/CVERecord?id=CVE-2018-15856
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-15856.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2018-15856
Downstream
Related
Published
2018-08-25T21:29:01.860Z
Modified
2026-06-04T08:18:05.712540Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

An infinite loop when reaching EOL unexpectedly in compose/parser.c (aka the keymap parser) in xkbcommon before 0.8.1 could be used by local attackers to cause a denial of service during parsing of crafted keymap files.

Database specific 
{
    "unresolved_ranges": [
        {
            "extracted_events": [
                {
                    "last_affected": "14.04"
                },
                {
                    "last_affected": "16.04"
                },
                {
                    "last_affected": "18.04"
                }
            ],
            "cpes": [
                "cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
                "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
                "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*"
            ],
            "vendor_product": "canonical:ubuntu_linux",
            "source": "CPE_STRING"
        }
    ]
}
References

Affected packages

Git / github.com/xkbcommon/libxkbcommon

Affected ranges

Type
GIT
Repo
https://github.com/xkbcommon/libxkbcommon
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
76a6048cf8f6dfcd64ffff4e36f5362ead385706
Fixed
842e4351c2c97de6051cab6ce36b4a81e709a0e1
Database specific 
{
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "0.8.1"
        }
    ],
    "cpe": "cpe:2.3:a:xkbcommon:xkbcommon:*:*:*:*:*:*:*:*",
    "source": [
        "CPE_RANGE",
        "REFERENCES"
    ]
}

Affected versions

xkbcommon-0.*
xkbcommon-0.2.0
xkbcommon-0.3.0
xkbcommon-0.3.1
xkbcommon-0.3.2
xkbcommon-0.4.0
xkbcommon-0.4.1
xkbcommon-0.4.2
xkbcommon-0.4.3
xkbcommon-0.5.0
xkbcommon-0.6.0
xkbcommon-0.6.1
xkbcommon-0.7.0
xkbcommon-0.7.1
xkbcommon-0.7.2
xkbcommon-0.8.0

Database specific

vanir_signatures 
[
    {
        "digest": {
            "function_hash": "111084396536791922603128660627799779023",
            "length": 2866.0
        },
        "id": "CVE-2018-15856-4feb5e44",
        "signature_version": "v1",
        "target": {
            "file": "src/compose/parser.c",
            "function": "lex"
        },
        "deprecated": false,
        "signature_type": "Function",
        "source": "https://github.com/xkbcommon/libxkbcommon/commit/842e4351c2c97de6051cab6ce36b4a81e709a0e1"
    },
    {
        "digest": {
            "line_hashes": [
                "339976281554706251715786465784200783707",
                "286489673923724958058425891237163149150",
                "213471127827195187591013137219067204299",
                "314939995327740885430641703664042403296"
            ],
            "threshold": 0.9
        },
        "id": "CVE-2018-15856-72580473",
        "signature_version": "v1",
        "target": {
            "file": "src/compose/parser.c"
        },
        "deprecated": false,
        "signature_type": "Line",
        "source": "https://github.com/xkbcommon/libxkbcommon/commit/842e4351c2c97de6051cab6ce36b4a81e709a0e1"
    }
]
source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-15856.json"
vanir_signatures_modified 
"2026-06-04T08:18:05Z"