CVE-2018-20843
- Source
- https://cve.org/CVERecord?id=CVE-2018-20843
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20843.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2018-20843
- Downstream
ALPINE (1)
BELL (1)
CLEANSTART (2)
MGASA (1)
openSUSE (2)
RLSA (1)
- Related
- Published
- 2019-06-24T17:15:09Z
- Modified
- 2026-07-08T19:45:28Z
- 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": [ { "cpes": [ "cpe:2.3:a:oracle:hospitality_res_3700:*:*:*:*:*:*:*:*" ], "extracted_events": [ { "introduced": "5.7" }, { "last_affected": "5.7.6" } ], "source": "CPE_RANGE", "vendor_product": "oracle:hospitality_res_3700" }, { "cpes": [ "cpe:2.3:a:tenable:nessus:*:*:*:*:*:*:*:*" ], "extracted_events": [ { "fixed": "8.15.0" } ], "source": "CPE_RANGE", "vendor_product": "tenable:nessus" }, { "cpes": [ "cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*", "cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:esm:*:*:*", "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*", "cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*", "cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*", "cpe:2.3:o:canonical:ubuntu_linux:19.04:*:*:*:*:*:*:*" ], "extracted_events": [ { "introduced": "12.04" }, { "last_affected": "12.04" }, { "introduced": "14.04" }, { "last_affected": "14.04" }, { "introduced": "16.04" }, { "last_affected": "16.04" }, { "introduced": "18.04" }, { "last_affected": "18.04" }, { "introduced": "18.10" }, { "last_affected": "18.10" }, { "introduced": "19.04" }, { "last_affected": "19.04" } ], "source": "CPE_STRING", "vendor_product": "canonical:ubuntu_linux" }, { "cpes": [ "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*", "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*" ], "extracted_events": [ { "introduced": "8.0" }, { "last_affected": "8.0" }, { "introduced": "9.0" }, { "last_affected": "9.0" } ], "source": "CPE_STRING", "vendor_product": "debian:debian_linux" }, { "cpes": [ "cpe:2.3:o:fedoraproject:fedora:29:*:*:*:*:*:*:*", "cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*" ], "extracted_events": [ { "introduced": "29" }, { "last_affected": "29" }, { "introduced": "30" }, { "last_affected": "30" } ], "source": "CPE_STRING", "vendor_product": "fedoraproject:fedora" }, { "cpes": [ "cpe:2.3:o:opensuse:leap:15.0:*:*:*:*:*:*:*", "cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*" ], "extracted_events": [ { "introduced": "15.0" }, { "last_affected": "15.0" }, { "introduced": "15.1" }, { "last_affected": "15.1" } ], "source": "CPE_STRING", "vendor_product": "opensuse:leap" }, { "cpes": [ "cpe:2.3:a:oracle:http_server:12.1.3.0:*:*:*:*:*:*:*", "cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*" ], "extracted_events": [ { "introduced": "12.1.3.0" }, { "last_affected": "12.1.3.0" }, { "introduced": "12.2.1.4.0" }, { "last_affected": "12.2.1.4.0" } ], "source": "CPE_STRING", "vendor_product": "oracle:http_server" }, { "cpes": [ "cpe:2.3:a:oracle:outside_in_technology:8.5.4:*:*:*:*:*:*:*", "cpe:2.3:a:oracle:outside_in_technology:8.5.5:*:*:*:*:*:*:*" ], "extracted_events": [ { "introduced": "8.5.4" }, { "last_affected": "8.5.4" }, { "introduced": "8.5.5" }, { "last_affected": "8.5.5" } ], "source": "CPE_STRING", "vendor_product": "oracle:outside_in_technology" } ] }- References
-
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CEJJSQSG3KSUQY4FPVHZ7ZTT7FORMFVD/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IDAUGEB3TUP6NEKJDBUBZX7N5OAUOOOK/
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00039.html
- https://github.com/libexpat/libexpat/blob/R_2_2_7/expat/Changes
- https://lists.debian.org/debian-lts-announce/2019/06/msg00028.html
- https://seclists.org/bugtraq/2019/Jun/39
- https://security.gentoo.org/glsa/201911-08
- https://security.netapp.com/advisory/ntap-20190703-0001/
- https://support.f5.com/csp/article/K51011533
- https://usn.ubuntu.com/4040-1/
- https://usn.ubuntu.com/4040-2/
- https://www.debian.org/security/2019/dsa-4472
- https://www.tenable.com/security/tns-2021-11
- https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=5226
- https://github.com/libexpat/libexpat/issues/186
- https://github.com/libexpat/libexpat/pull/262
- https://github.com/libexpat/libexpat/pull/262/commits/11f8838bf99ea0a6f0b76f9760c43704d00c4ff6
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://www.oracle.com/security-alerts/cpuapr2020.html
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://www.oracle.com/security-alerts/cpuoct2021.html
Affected packages
Git / github.com/libexpat/libexpat
Affected ranges
- Type
- GIT
- Repo
- https://github.com/libexpat/libexpat
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
- Database specific
-
Show details
{ "cpe": "cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*", "extracted_events": [ { "introduced": "0" }, { "fixed": "2.2.7" } ], "source": "CPE_RANGE" }
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
source
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20843.json"
vanir_signatures
[
{
"deprecated": false,
"digest": {
"function_hash": "10718674393994758979083102855553023681",
"length": 670
},
"id": "CVE-2018-20843-74406d59",
"signature_type": "Function",
"signature_version": "v1",
"source": "https://github.com/libexpat/libexpat/commit/d3b78b42a2dcdea98e22625cfff67a49d47e6025",
"target": {
"file": "expat/tests/runtests.c",
"function": "START_TEST"
}
},
{
"deprecated": false,
"digest": {
"line_hashes": [
"70970158302216444732948686873374648009",
"197734145770944038326200234670765972062",
"333002349092091346504095730741649465004",
"132190683235044997527211951942674695301"
],
"threshold": 0.9
},
"id": "CVE-2018-20843-ee80e572",
"signature_type": "Line",
"signature_version": "v1",
"source": "https://github.com/libexpat/libexpat/commit/d3b78b42a2dcdea98e22625cfff67a49d47e6025",
"target": {
"file": "expat/tests/runtests.c"
}
}
]
vanir_signatures_modified
"2026-07-08T19:45:28Z"