Medium
Security advisory
The xmlDictAddString function in libxml2 before 2.9.4, as used in Apple iOS before 9.3.2, OS X before 10.11.5, tvOS before 9.2.1, and watchOS before 2.2.1, allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted XML document.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2016-1839
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:12 UTC · Revision 1
Source evidence
The xmlDictAddString function in libxml2 before 2.9.4, as used in Apple iOS before 9.3.2, OS X before 10.11.5, tvOS before 9.2.1, and watchOS before 2.2.1, allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted XML document.
osv:CVE-2016-1839
Complete source record
{
"id": "3b2003be18ff4036987cb5508656c2a317e1e7b4e8433e5aaba1fa7b94213e74",
"url": "https://osv.dev/vulnerability/CVE-2016-1839",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2016-1839",
"summary": "The xmlDictAddString function in libxml2 before 2.9.4, as used in Apple iOS before 9.3.2, OS X before 10.11.5, tvOS before 9.2.1, and watchOS before 2.2.1, allows remote attackers to cause a denial of service (heap-based buffer over-read) via a crafted XML document.",
"evidence": "osv:CVE-2016-1839",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2016-1839",
"aliases": [
"CVE-2016-1839"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/gnome/libxml2",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "bdec2183f34b37ee89ae1d330c6ad2bb4d76605f"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.9.4"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"CVE-2016-3627",
"CVE-2016-1833",
"CVE-2016-1835",
"CVE-2016-1837",
"CVE-2016-1836",
"CVE-2016-1839",
"CVE-2016-1838",
"CVE-2016-1840",
"CVE-2016-4449",
"CVE-2016-4483",
"CVE-2016-1834",
"CVE-2016-3705",
"v2.9.4-rc2",
"v2.9.4-rc1",
"CVE-2016-1762",
"v2.9.3",
"CVE-2015-8242",
"CVE-2015-7500",
"CVE-2015-7499-2",
"CVE-2015-7499-1",
"CVE-2015-5312",
"CVE-2015-7497",
"CVE-2015-7498",
"CVE-2015-8035",
"CVE-2015-7942-2",
"CVE-2015-7942",
"CVE-2015-8317",
"CVE-2015-1819",
"CVE-2015-7941_2",
"CVE-2015-7941_1",
"v2.9.2",
"CVE-2014-3660",
"v2.9.2-rc2",
"v2.9.2-rc1",
"CVE-2014-0191",
"v2.9.1",
"CVE-2013-2877",
"v2.9.0",
"v2.9.0-rc2",
"v2.8.0",
"v2.8.0-rc2",
"v2.8.0-rc1",
"v2.7.8",
"v2.7.7",
"v2.7.6",
"v2.7.5",
"v2.7.4",
"LIBXML2.7.3",
"LIBXML2.7.2",
"LIBXML2.7.1",
"LIBXML2.7.0",
"LIBXML2.6.32",
"LIBXML2_2_6_28",
"LIBXML2_2_6_27",
"LIBXML2_2_6_26",
"LIBXML2_2_6_24",
"LIBXML2_2_6_23",
"LIBXML2_2_6_22",
"LIBXML2_2_6_21",
"LIBXML2_2_6_20",
"LIBXML2_2_6_19",
"LIBXML2_2_6_18",
"LIBXML2_2_6_16",
"LIBXML2_2_6_15",
"LIBXML2_2_6_14",
"LIBXML2_2_6_13",
"LIBXML2_2_6_12",
"LIBXML2_2_6_11",
"LIBXML_2_6_10",
"LIBXML2_2_6_9",
"LIBXML2_2_6_8",
"LIBXML2_2_6_7",
"LIBXML2_2_6_6",
"LIBXML2_2_6_5",
"LIBXML2_2_6_4",
"LIBXML2_2_6_3",
"LIBXML2_2_6_2",
"LIBXML2_2_6_1",
"LIBXML2_6_0",
"LIBXML2_2_5_x",
"LIBXML2_2_5_10",
"LIBXML2_2_5_9",
"LIBXML2_2_5_8",
"LIBXML2_2_5_7",
"LIBXML_2_5_6",
"LIBXML_2_5_5",
"LIBXML_2_5_4",
"LIBXML_2_5_3",
"LIBXML_2_5_2",
"LIBXML_2_5_1",
"LIBXML2_2_5_0",
"LIBXML_2_4_30",
"LIBXML_2_4_29",
"LIBXML_2_4_27",
"LIBXML_2_4_26",
"LIBXML_2_4_25",
"LIBXML_2_4_24",
"LIBXML_2_4_23",
"LIBXML_2_4_22",
"LIBXML2_2_4_21",
"LIBXML_2_4_20",
"LIBXML_2_4_18",
"LIBXML_2_4_13",
"LIBXML_2_4_16",
"LIBXML_2_4_14",
"LIBXML_2_4_12",
"LIBXML_2_4_11",
"LIBXML_2_4_7",
"LIBXML_2_4_6",
"LIBXML_2_4_4",
"LIBXML_2_4_3",
"LIBXML_2_4_2",
"LIBXML_2_4_0",
"LIBXML_2_3_14",
"LIBXML_2_3_13",
"LIBXML_2_3_12",
"LIBXML_2_3_11",
"LIBXML_2_3_10",
"LIBXML_2_3_9",
"LIBXML_2_3_8",
"help",
"LIBXML_2_3_7",
"LIBXML_2_3_6",
"LIBXML_2_3_5",
"LIBXML_2_3_4",
"LIBXML_2_3_3",
"LIBXML_2_3_2",
"PRE_MUCKUP3",
"PRE_MUCKUP2",
"PRE_MUCKUP",
"LIBXML_2_3_0",
"LIBXML_2_2_8",
"LIBXML_2_2_7",
"LIBXML_2_2_6",
"LIBXML_2_2_4",
"GNOME_PRINT_0_24",
"LIBXML_2_2_3",
"LIBXML_2_2_1",
"LIBXML_2_1_1",
"LIBXML_2_1_0",
"LIB_XML_1_X",
"EAZEL-NAUTILUS-MS-AUG07",
"LIBXML_2_0_0",
"LIBXML_TEST_2_0_0",
"LIBXML_1_8_6",
"LIBXML_1_8_5",
"LIB_XML_1_8_3",
"LIB_XML_1_7_3",
"LIB_XML_1_7_1",
"LIB_XML_1_7_0",
"LIB_XML_1_6_2",
"LIB_XML_1_6_1",
"LIBXML_1_5_0",
"LIB_XML_1_4",
"LIB_XML_1_3",
"LIB_XML_1_1",
"FOR_GNOME_0_99_1",
"LIBXML_0_99",
"GNUMERIC_FIRST_PUBLIC_RELEASE",
"GNOME_0_30"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-1839.json"
}
},
{
"ranges": [
{
"repo": "https://gitlab.gnome.org/gnome/libxml2",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "bdec2183f34b37ee89ae1d330c6ad2bb4d76605f"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.9.4"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"CVE-2016-3627",
"CVE-2016-1833",
"CVE-2016-1835",
"CVE-2016-1837",
"CVE-2016-1836",
"CVE-2016-1839",
"CVE-2016-1838",
"CVE-2016-1840",
"CVE-2016-4449",
"CVE-2016-4483",
"CVE-2016-1834",
"CVE-2016-3705",
"v2.9.4-rc2",
"v2.9.4-rc1",
"CVE-2016-1762",
"v2.9.3",
"CVE-2015-8242",
"CVE-2015-7500",
"CVE-2015-7499-2",
"CVE-2015-7499-1",
"CVE-2015-5312",
"CVE-2015-7497",
"CVE-2015-7498",
"CVE-2015-8035",
"CVE-2015-7942-2",
"CVE-2015-7942",
"CVE-2015-8317",
"CVE-2015-1819",
"CVE-2015-7941_2",
"CVE-2015-7941_1",
"v2.9.2",
"CVE-2014-3660",
"v2.9.2-rc2",
"v2.9.2-rc1",
"CVE-2014-0191",
"v2.9.1",
"CVE-2013-2877",
"v2.9.0",
"v2.9.0-rc2",
"v2.8.0",
"v2.8.0-rc2",
"v2.8.0-rc1",
"v2.7.8",
"v2.7.7",
"v2.7.6",
"v2.7.5",
"v2.7.4",
"LIBXML2.7.3",
"LIBXML2.7.2",
"LIBXML2.7.1",
"LIBXML2.7.0",
"LIBXML2.6.32",
"LIBXML2_2_6_28",
"LIBXML2_2_6_27",
"LIBXML2_2_6_26",
"LIBXML2_2_6_24",
"LIBXML2_2_6_23",
"LIBXML2_2_6_22",
"LIBXML2_2_6_21",
"LIBXML2_2_6_20",
"LIBXML2_2_6_19",
"LIBXML2_2_6_18",
"LIBXML2_2_6_16",
"LIBXML2_2_6_15",
"LIBXML2_2_6_14",
"LIBXML2_2_6_13",
"LIBXML2_2_6_12",
"LIBXML2_2_6_11",
"LIBXML_2_6_10",
"LIBXML2_2_6_9",
"LIBXML2_2_6_8",
"LIBXML2_2_6_7",
"LIBXML2_2_6_6",
"LIBXML2_2_6_5",
"LIBXML2_2_6_4",
"LIBXML2_2_6_3",
"LIBXML2_2_6_2",
"LIBXML2_2_6_1",
"LIBXML2_6_0",
"LIBXML2_2_5_x",
"LIBXML2_2_5_10",
"LIBXML2_2_5_9",
"LIBXML2_2_5_8",
"LIBXML2_2_5_7",
"LIBXML_2_5_6",
"LIBXML_2_5_5",
"LIBXML_2_5_4",
"LIBXML_2_5_3",
"LIBXML_2_5_2",
"LIBXML_2_5_1",
"LIBXML2_2_5_0",
"LIBXML_2_4_30",
"LIBXML_2_4_29",
"LIBXML_2_4_27",
"LIBXML_2_4_26",
"LIBXML_2_4_25",
"LIBXML_2_4_24",
"LIBXML_2_4_23",
"LIBXML_2_4_22",
"LIBXML2_2_4_21",
"LIBXML_2_4_20",
"LIBXML_2_4_18",
"LIBXML_2_4_13",
"LIBXML_2_4_16",
"LIBXML_2_4_14",
"LIBXML_2_4_12",
"LIBXML_2_4_11",
"LIBXML_2_4_7",
"LIBXML_2_4_6",
"LIBXML_2_4_4",
"LIBXML_2_4_3",
"LIBXML_2_4_2",
"LIBXML_2_4_0",
"LIBXML_2_3_14",
"LIBXML_2_3_13",
"LIBXML_2_3_12",
"LIBXML_2_3_11",
"LIBXML_2_3_10",
"LIBXML_2_3_9",
"LIBXML_2_3_8",
"help",
"LIBXML_2_3_7",
"LIBXML_2_3_6",
"LIBXML_2_3_5",
"LIBXML_2_3_4",
"LIBXML_2_3_3",
"LIBXML_2_3_2",
"PRE_MUCKUP3",
"PRE_MUCKUP2",
"PRE_MUCKUP",
"LIBXML_2_3_0",
"LIBXML_2_2_8",
"LIBXML_2_2_7",
"LIBXML_2_2_6",
"LIBXML_2_2_4",
"GNOME_PRINT_0_24",
"LIBXML_2_2_3",
"LIBXML_2_2_1",
"LIBXML_2_1_1",
"LIBXML_2_1_0",
"LIB_XML_1_X",
"EAZEL-NAUTILUS-MS-AUG07",
"LIBXML_2_0_0",
"LIBXML_TEST_2_0_0",
"LIBXML_1_8_6",
"LIBXML_1_8_5",
"LIB_XML_1_8_3",
"LIB_XML_1_7_3",
"LIB_XML_1_7_1",
"LIB_XML_1_7_0",
"LIB_XML_1_6_2",
"LIB_XML_1_6_1",
"LIBXML_1_5_0",
"LIB_XML_1_4",
"LIB_XML_1_3",
"LIB_XML_1_1",
"FOR_GNOME_0_99_1",
"LIBXML_0_99",
"GNUMERIC_FIRST_PUBLIC_RELEASE",
"GNOME_0_30"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2016-1839.json"
}
}
],
"modified": "2026-10-24T10:31:04.293586435Z",
"provider": "osv",
"references": [
"https://access.redhat.com/errata/RHSA-2016:1292",
"https://security.gentoo.org/glsa/201701-37",
"https://support.apple.com/HT206564",
"https://support.apple.com/HT206566",
"https://support.apple.com/HT206567",
"https://support.apple.com/HT206568",
"https://www.debian.org/security/2016/dsa-3593",
"https://www.tenable.com/security/tns-2016-18",
"https://bugzilla.gnome.org/show_bug.cgi?id=758605",
"https://git.gnome.org/browse/libxml2/commit/?id=a820dbeac29d330bae4be05d9ecd939ad6b4aa33",
"https://kc.mcafee.com/corporate/index?page=content&id=SB10170"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*"
],
"vendor_product": "apple:iphone_os",
"extracted_events": [
{
"range": [
{
"fixed": "9.3.2"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:apple:mac_os_x:*:*:*:*:*:*:*:*"
],
"vendor_product": "apple:mac_os_x",
"extracted_events": [
{
"range": [
{
"fixed": "10.11.5"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:apple:tvos:*:*:*:*:*:*:*:*"
],
"vendor_product": "apple:tvos",
"extracted_events": [
{
"range": [
{
"fixed": "9.2.1"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:apple:watchos:*:*:*:*:*:*:*:*"
],
"vendor_product": "apple:watchos",
"extracted_events": [
{
"range": [
{
"fixed": "2.2.1"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:a:mcafee:web_gateway:*:*:*:*:*:*:*:*"
],
"vendor_product": "mcafee:web_gateway",
"extracted_events": [
{
"range": [
{
"introduced": "7.5.0.0"
},
{
"last_affected": "7.5.2.10"
},
{
"introduced": "7.6.0.0"
},
{
"last_affected": "7.6.2.3"
}
],
"source": "CPE_RANGE"
}
]
},
{
"cpes": [
"cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:15.10:*:*:*:*:*:*:*",
"cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*"
],
"vendor_product": "canonical:ubuntu_linux",
"extracted_events": [
{
"range": [
{
"introduced": "12.04"
},
{
"last_affected": "12.04"
},
{
"introduced": "14.04"
},
{
"last_affected": "14.04"
},
{
"introduced": "15.10"
},
{
"last_affected": "15.10"
},
{
"introduced": "16.04"
},
{
"last_affected": "16.04"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "8.0"
},
{
"last_affected": "8.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_desktop",
"extracted_events": [
{
"range": [
{
"introduced": "6.0"
},
{
"last_affected": "6.0"
},
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_server",
"extracted_events": [
{
"range": [
{
"introduced": "6.0"
},
{
"last_affected": "6.0"
},
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_server_aus:7.2:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_aus:7.3:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_aus:7.4:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_server_aus",
"extracted_events": [
{
"range": [
{
"introduced": "7.2"
},
{
"last_affected": "7.2"
},
{
"introduced": "7.3"
},
{
"last_affected": "7.3"
},
{
"introduced": "7.4"
},
{
"last_affected": "7.4"
},
{
"introduced": "7.6"
},
{
"last_affected": "7.6"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_server_eus:7.2:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_eus:7.3:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_eus:7.4:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_server_eus",
"extracted_events": [
{
"range": [
{
"introduced": "7.2"
},
{
"last_affected": "7.2"
},
{
"introduced": "7.3"
},
{
"last_affected": "7.3"
},
{
"introduced": "7.4"
},
{
"last_affected": "7.4"
},
{
"introduced": "7.5"
},
{
"last_affected": "7.5"
},
{
"introduced": "7.6"
},
{
"last_affected": "7.6"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_server_tus:7.2:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_tus:7.3:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_server_tus",
"extracted_events": [
{
"range": [
{
"introduced": "7.2"
},
{
"last_affected": "7.2"
},
{
"introduced": "7.3"
},
{
"last_affected": "7.3"
},
{
"introduced": "7.6"
},
{
"last_affected": "7.6"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*",
"cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*"
],
"vendor_product": "redhat:enterprise_linux_workstation",
"extracted_events": [
{
"range": [
{
"introduced": "6.0"
},
{
"last_affected": "6.0"
},
{
"introduced": "7.0"
},
{
"last_affected": "7.0"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2016-1839",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 440469,
"published_at": "2016-05-20T10:59:53.19+00:00"
}