CVE-2026-86143

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Source
https://cve.org/CVERecord?id=CVE-2026-86143
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-86143.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-86143
Downstream
Published
2026-09-05T04:31:21Z
Modified
2026-09-17T08:09:59Z
Severity
  • 6.9 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L CVSS Calculator
Summary
[none]
Details

In xmlIO in libxml2 before 2.15.4, an inconsistency in xmlOutputWriteCallback and xmlBufUse causes negative lengths to reach write callbacks, aka a lack of a check for integer overflow before calling writecallback. This has security relevance for many types of uses of that length value within a callback.

Database specific 
{
    "cna_assigner":  "mitre",
    "cwe_ids":  [
        "CWE-192"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86143.json"
}
References

Affected packages

Git / github.com/gnome/libxml2

Affected ranges

Type
GIT
Repo
https://github.com/gnome/libxml2
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
96498992efa48d52b0e8b83058bd88dbdaf153c1
Fixed
90f293ba74d28b1d570920382e707586f68ebf35
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "2.15.4"
        }
    ],
    "source":  [
        "CPE_RANGE",
        "REFERENCES"
    ]
}
Type
GIT
Repo
https://gitlab.gnome.org/gnome/libxml2
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
96498992efa48d52b0e8b83058bd88dbdaf153c1
Database specific
Show details 
{
    "cpe":  "cpe:2.3:a:xmlsoft:libxml2:*:*:*:*:*:*:*:*",
    "extracted_events":  [
        {
            "introduced":  "0"
        },
        {
            "fixed":  "2.15.4"
        }
    ],
    "source":  "CPE_RANGE"
}

Affected versions

Other
CVE-2013-2877
CVE-2014-0191
CVE-2014-3660
CVE-2015-1819
CVE-2015-5312
CVE-2015-7497
CVE-2015-7498
CVE-2015-7499-1
CVE-2015-7499-2
CVE-2015-7500
CVE-2015-7941_1
CVE-2015-7941_2
CVE-2015-7942
CVE-2015-7942-2
CVE-2015-8035
CVE-2015-8242
CVE-2015-8317
CVE-2016-1762
CVE-2016-1833
CVE-2016-1834
CVE-2016-1835
CVE-2016-1836
CVE-2016-1837
CVE-2016-1838
CVE-2016-1839
CVE-2016-1840
CVE-2016-3627
CVE-2016-3705
CVE-2016-4449
CVE-2016-4483
CVE-2021-3541
EAZEL-NAUTILUS-MS-AUG07
FOR_GNOME_0_99_1
GNOME_0_30
GNOME_PRINT_0_24
GNUMERIC_FIRST_PUBLIC_RELEASE
LIBXML2_2_4_21
LIBXML2_2_5_0
LIBXML2_2_5_10
LIBXML2_2_5_7
LIBXML2_2_5_8
LIBXML2_2_5_9
LIBXML2_2_5_x
LIBXML2_2_6_1
LIBXML2_2_6_11
LIBXML2_2_6_12
LIBXML2_2_6_13
LIBXML2_2_6_14
LIBXML2_2_6_15
LIBXML2_2_6_16
LIBXML2_2_6_18
LIBXML2_2_6_19
LIBXML2_2_6_2
LIBXML2_2_6_20
LIBXML2_2_6_21
LIBXML2_2_6_22
LIBXML2_2_6_23
LIBXML2_2_6_24
LIBXML2_2_6_26
LIBXML2_2_6_27
LIBXML2_2_6_28
LIBXML2_2_6_3
LIBXML2_2_6_4
LIBXML2_2_6_5
LIBXML2_2_6_6
LIBXML2_2_6_7
LIBXML2_2_6_8
LIBXML2_2_6_9
LIBXML2_6_0
LIBXML_0_99
LIBXML_1_5_0
LIBXML_1_8_5
LIBXML_1_8_6
LIBXML_2_0_0
LIBXML_2_1_0
LIBXML_2_1_1
LIBXML_2_2_1
LIBXML_2_2_3
LIBXML_2_2_4
LIBXML_2_2_6
LIBXML_2_2_7
LIBXML_2_2_8
LIBXML_2_3_0
LIBXML_2_3_10
LIBXML_2_3_11
LIBXML_2_3_12
LIBXML_2_3_13
LIBXML_2_3_14
LIBXML_2_3_2
LIBXML_2_3_3
LIBXML_2_3_4
LIBXML_2_3_5
LIBXML_2_3_6
LIBXML_2_3_7
LIBXML_2_3_8
LIBXML_2_3_9
LIBXML_2_4_0
LIBXML_2_4_11
LIBXML_2_4_12
LIBXML_2_4_13
LIBXML_2_4_14
LIBXML_2_4_16
LIBXML_2_4_18
LIBXML_2_4_2
LIBXML_2_4_20
LIBXML_2_4_22
LIBXML_2_4_23
LIBXML_2_4_24
LIBXML_2_4_25
LIBXML_2_4_26
LIBXML_2_4_27
LIBXML_2_4_29
LIBXML_2_4_3
LIBXML_2_4_30
LIBXML_2_4_4
LIBXML_2_4_6
LIBXML_2_4_7
LIBXML_2_5_1
LIBXML_2_5_2
LIBXML_2_5_3
LIBXML_2_5_4
LIBXML_2_5_5
LIBXML_2_5_6
LIBXML_2_6_10
LIBXML_TEST_2_0_0
LIB_XML_1_1
LIB_XML_1_3
LIB_XML_1_4
LIB_XML_1_6_1
LIB_XML_1_6_2
LIB_XML_1_7_0
LIB_XML_1_7_1
LIB_XML_1_7_3
LIB_XML_1_8_3
LIB_XML_1_X
PRE_MUCKUP
PRE_MUCKUP2
PRE_MUCKUP3
help
LIBXML2.*
LIBXML2.6.32
LIBXML2.7.0
LIBXML2.7.1
LIBXML2.7.2
LIBXML2.7.3
v2.*
v2.10.0
v2.11.0
v2.12.0
v2.13.0
v2.14.0
v2.15.0
v2.15.1
v2.15.2
v2.15.3
v2.7.4
v2.7.5
v2.7.6
v2.7.7
v2.7.8
v2.8.0
v2.8.0-rc1
v2.8.0-rc2
v2.9.0
v2.9.0-rc2
v2.9.1
v2.9.10
v2.9.10-rc1
v2.9.11
v2.9.12
v2.9.13
v2.9.2
v2.9.2-rc1
v2.9.2-rc2
v2.9.3
v2.9.4
v2.9.4-rc1
v2.9.4-rc2
v2.9.5
v2.9.5-rc1
v2.9.5-rc2
v2.9.6
v2.9.6-rc1
v2.9.7
v2.9.7-rc1
v2.9.8
v2.9.8-rc1
v2.9.9
v2.9.9-rc1
v2.9.9-rc2

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-86143.json"
vanir_signatures 
[
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "243576193567631229623768379237119141804",
            "length":  1433
        },
        "id":  "CVE-2026-86143-3a0a366f",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/gnome/libxml2/commit/90f293ba74d28b1d570920382e707586f68ebf35",
        "target":  {
            "file":  "xmlIO.c",
            "function":  "xmlOutputBufferWrite"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "line_hashes":  [
                "135824017899079385230044656418834369516",
                "178943050198151867406913195363365258965",
                "122799734892684795311319558438398291924",
                "251862891669818244351874468049992981706",
                "156976809351673311653226252900490666252",
                "62784944547850306834330791735045408432",
                "195597737505191357361111100492823418640",
                "33892583182042890897181355713455150679",
                "213677539294908006739892218117981542638",
                "82118793017114255533048050657397870287",
                "294667027545259159252479420151736921945",
                "145160530304768202336903496412302394733",
                "315151670324453602076834418846677609302",
                "179464180209241932068184880902218271811",
                "214081964191764141670796369021475985815",
                "110020968457343585378647628930813405329"
            ],
            "threshold":  0.9
        },
        "id":  "CVE-2026-86143-95bfda7e",
        "signature_type":  "Line",
        "signature_version":  "v1",
        "source":  "https://github.com/gnome/libxml2/commit/90f293ba74d28b1d570920382e707586f68ebf35",
        "target":  {
            "file":  "xmlIO.c"
        }
    },
    {
        "deprecated":  false,
        "digest":  {
            "function_hash":  "234769112045346764165499557337877152097",
            "length":  1009
        },
        "id":  "CVE-2026-86143-aa423db0",
        "signature_type":  "Function",
        "signature_version":  "v1",
        "source":  "https://github.com/gnome/libxml2/commit/90f293ba74d28b1d570920382e707586f68ebf35",
        "target":  {
            "file":  "xmlIO.c",
            "function":  "xmlOutputBufferFlush"
        }
    }
]
vanir_signatures_modified 
"2026-09-17T08:09:59Z"