{"id":"CVE-2026-86140","details":"In libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat stack-based buffer overflow.","modified":"2026-09-06T08:01:50.236985Z","published":"2026-09-05T04:26:13.860Z","database_specific":{"cna_assigner":"mitre","cwe_ids":["CWE-121"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86140.json","unresolved_ranges":[{"extracted_events":[{"fixed":"2.15.4"}],"source":"AFFECTED_FIELD"},{"extracted_events":[{"fixed":"2.15.4"}],"source":"CPE_FIELD"},{"extracted_events":[{"introduced":"libxml2"},{"fixed":"2.15.4"}],"source":"DESCRIPTION"}]},"references":[{"type":"WEB","url":"https://github.com/GNOME/libxml2/compare/v2.15.3...v2.15.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/86xxx/CVE-2026-86140.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-86140"},{"type":"FIX","url":"https://github.com/GNOME/libxml2/commit/d1686f91dbda141a752200419d35639fd6b38340"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/gnome/libxml2","events":[{"introduced":"0"},{"fixed":"d1686f91dbda141a752200419d35639fd6b38340"}],"database_specific":{"source":"REFERENCES"}}],"versions":["v2.15.3","v2.15.2","v2.15.1","v2.15.0","v2.14.0","v2.13.0","v2.12.0","v2.11.0","v2.10.0","v2.9.13","v2.9.12","v2.9.11","CVE-2021-3541","v2.9.10","v2.9.10-rc1","v2.9.9","v2.9.9-rc2","v2.9.9-rc1","v2.9.8","v2.9.8-rc1","v2.9.7","v2.9.7-rc1","v2.9.6","v2.9.6-rc1","v2.9.5","v2.9.5-rc2","v2.9.5-rc1","v2.9.4","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-2026-86140.json","vanir_signatures_modified":"2026-09-06T08:01:50Z","vanir_signatures":[{"id":"CVE-2026-86140-4782bd6c","signature_type":"Function","signature_version":"v1","source":"https://github.com/gnome/libxml2/commit/d1686f91dbda141a752200419d35639fd6b38340","target":{"file":"valid.c","function":"xmlSnprintfElements"},"deprecated":false,"digest":{"function_hash":"130597350388435265844608665998721209154","length":1757}},{"id":"CVE-2026-86140-a16b75f1","signature_type":"Line","signature_version":"v1","source":"https://github.com/gnome/libxml2/commit/d1686f91dbda141a752200419d35639fd6b38340","target":{"file":"valid.c"},"deprecated":false,"digest":{"line_hashes":["119543098351765964388823927147282784643","271909022695536419469264749611667443708","215335912178009589414389142897950978120","303774327218663884487649299126787037860","78458041918150850950971139628900268737","110610927479821408314796361861597199554","264522835633174867180350571253991174384","282891446116975250513253912020971360863"],"threshold":0.9}}]}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L"}]}