CVE-2018-20843

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Source
https://cve.org/CVERecord?id=CVE-2018-20843
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-20843.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2018-20843
Downstream
Related
Published
2019-06-24T17:15:09.980Z
Modified
2026-04-11T21:31:46.496299Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

In libexpat in Expat before 2.2.7, XML input including XML names that contain a large number of colons could make the XML parser consume a high amount of RAM and CPU resources while processing (enough to be usable for denial-of-service attacks).

Database specific 
{
    "unresolved_ranges": [
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:a:oracle:hospitality_res_3700:*:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "introduced": "5.7"
                },
                {
                    "last_affected": "5.7.6"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:a:oracle:http_server:12.1.3.0:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "12.1.3.0"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "12.2.1.4.0"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:a:oracle:outside_in_technology:8.5.4:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "8.5.4"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:a:oracle:outside_in_technology:8.5.5:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "8.5.5"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:a:tenable:nessus:*:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "fixed": "8.15.0"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "12.04"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "14.04"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "16.04"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "18.04"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "18.10"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "19.04"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "8.0"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "9.0"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "29"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "30"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "15.0"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "cpe": "cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*",
            "extracted_events": [
                {
                    "last_affected": "15.1"
                }
            ]
        }
    ]
}
References

Affected packages

Git / github.com/libexpat/libexpat

Affected ranges

Type
GIT
Repo
https://github.com/libexpat/libexpat
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
d3b78b42a2dcdea98e22625cfff67a49d47e6025
Database specific 
{
    "source": "CPE_FIELD",
    "cpe": "cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.2.7"
        }
    ]
}

Affected versions

Other
REC1_0
R_1_95_0
R_1_95_2
R_1_95_3
R_1_95_4
R_1_95_5
R_1_95_6
R_1_95_7
R_1_95_8
R_2_0_0
R_2_0_1
R_2_1_0
R_2_1_1
R_2_2_0
R_2_2_1
R_2_2_2
R_2_2_3
R_2_2_4
R_2_2_5
R_2_2_6
V1990307
V19981122
V19981231
V19990109
V19990425
V19990626
V19990709
V19990728
V19991013
V1_0
V1_1
V20000512
beta2
beta3
beta4
jclark-orig
libexpat-alpha-1
sourceforge_init
start

Database specific

vanir_signatures_modified 
"2026-04-11T21:31:46Z"
source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2018-20843.json"
vanir_signatures 
[
    {
        "target": {
            "function": "START_TEST",
            "file": "expat/tests/runtests.c"
        },
        "signature_version": "v1",
        "deprecated": false,
        "digest": {
            "length": 670.0,
            "function_hash": "10718674393994758979083102855553023681"
        },
        "id": "CVE-2018-20843-74406d59",
        "source": "https://github.com/libexpat/libexpat/commit/d3b78b42a2dcdea98e22625cfff67a49d47e6025",
        "signature_type": "Function"
    },
    {
        "target": {
            "file": "expat/tests/runtests.c"
        },
        "signature_version": "v1",
        "deprecated": false,
        "digest": {
            "threshold": 0.9,
            "line_hashes": [
                "70970158302216444732948686873374648009",
                "197734145770944038326200234670765972062",
                "333002349092091346504095730741649465004",
                "132190683235044997527211951942674695301"
            ]
        },
        "id": "CVE-2018-20843-ee80e572",
        "source": "https://github.com/libexpat/libexpat/commit/d3b78b42a2dcdea98e22625cfff67a49d47e6025",
        "signature_type": "Line"
    }
]