{"id":"CVE-2026-86139","aliases":["AZL-99714","BELL-CVE-2026-86139","DEBIAN-CVE-2026-86139","EUVD-2026-71832","GHSA-xvw4-gjw8-rw38","MGASA-2026-0459","RHSA-2026:64463","UBUNTU-CVE-2026-86139","USN-8910-1"],"status":"published","title":"In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.","description":"In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer 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libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.","status":"published","published":"2026-09-05T04:23:14.686Z","modified":"2026-09-08T13:04:24.068Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T13:49:31.546614Z"}],"euvd":[{"id":"EUVD-2026-71832","description":"In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.","status":"published","published":"2026-09-05T04:23:14Z","modified":"2026-09-08T13:04:24Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"medium"}],"updated_at":"2026-11-02T17:28:29.861344Z"}],"ghsa":[{"id":"GHSA-xvw4-gjw8-rw38","title":"In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.","description":"In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.","status":"published","published":"2026-09-05T06:32:36Z","modified":"2026-09-05T06:32:44Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"medium"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T15:11:24.326884Z"}],"nvd":[{"id":"CVE-2026-86139","description":"In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.","status":"published","published":"2026-09-05T05:17:12.73Z","modified":"2026-09-15T19:39:45.267Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T14:12:44.082631Z"}],"osv":[{"id":"BELL-CVE-2026-86139","status":"published","published":"2026-09-08T06:05:22.28971Z","modified":"2026-10-02T07:15:05.849441565Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:28:26.341144Z"},{"id":"CVE-2026-86139","description":"In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.","status":"published","published":"2026-09-05T04:23:14.686Z","modified":"2026-10-28T11:01:38.689811837Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"medium"}],"cwes":["CWE-190"],"updated_at":"2026-11-02T15:45:18.825071Z"},{"id":"DEBIAN-CVE-2026-86139","description":"In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.","status":"published","published":"2026-09-05T05:17:12.73Z","modified":"2026-10-04T15:00:08.363868906Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:46:05.022702Z"},{"id":"RHSA-2026:64463","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-09-09T10:19:53Z","modified":"2026-10-16T10:22:19Z","cvss":[{"version":"3.1","score":8.5,"vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:21.91255Z"},{"id":"UBUNTU-CVE-2026-86139","description":"In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.","status":"published","published":"2026-09-05T05:17:00Z","modified":"2026-10-09T07:45:02.903457059Z","cvss":[{"version":"3.1","score":6.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"medium"},{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T16:57:24.828975Z"},{"id":"AZL-99714","title":"CVE-2026-86139 affecting package libxml2 2.11.5-10","description":"In libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer overflow.","status":"published","published":"2026-09-05T05:17:12Z","modified":"2026-09-08T05:27:28Z","updated_at":"2026-11-02T15:28:12.596039Z"},{"id":"MGASA-2026-0459","title":"Updated libxml2 packages fix security vulnerabilities","description":"The updated packages fix several security issues:\nStack-Based Buffer Overflow in libxml2. (CVE-2026-11979)\nIn libxml2 before 2.15.4, xmlFAParsePosCharGroup has an out-of-bounds\nread, aka an out-of-bounds read in the NXT macro in xmlregexp.\n(CVE-2026-86137)\nIn libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer\noverflow and resultant heap-based buffer overflow. (CVE-2026-86138)\nIn libxml2 before 2.15.4, xmlURIEscapeStr in uri.c has an integer\noverflow. (CVE-2026-86139)\nIn libxml2 before 2.15.4, xmlSnprintfElements in valid.c has a strcat\nstack-based buffer overflow. (CVE-2026-86140)\nxmlregexp in libxml2 before 2.15.4 has a NULL pointer dereference in\nxmlRegNewParserCtxt after a strdup failure, i.e., it does not calculate\na string length after NULL checking. (CVE-2026-86141)\nIn libxml2 before 2.15.4, there is a heap-based buffer overflow in\nxmlXPtrEvalXPtrPart because of xmlXPtrEval xpointer length saturation.\n(CVE-2026-86142)\nIn xmlIO in libxml2 before 2.15.4, an inconsistency in\nxmlOutputWriteCallback and xmlBufUse causes negative lengths to reach\nwrite callbacks, aka a lack of a check for integer overflow before\ncalling writecallback. This has security relevance for many types of\nuses of that length value within a callback. (CVE-2026-86143)\nIn xinclude in libxml2 before 2.15.4, xmlXIncludeProcess and\nxmlXIncludeProcessTree do not propagate parseFlags. This has security\nrelevance for, for example, the XML_PARSE_NONET flag, if (without it) a\ncustom resource loader accesses the internet and triggers XML external\nentity injection, SSRF, or a denial of service (e.g., for an\nattacker-controlled internet resource that is intentionally slow).\n(CVE-2026-86144)\n","status":"published","published":"2026-09-28T17:04:04Z","modified":"2026-09-28T17:15:03.661029458Z","updated_at":"2026-11-02T15:49:43.795591Z"},{"id":"USN-8910-1","title":"libxml2 vulnerabilities","description":"Yirou Yang discovered that libxml2 incorrectly handled certain XML\ncatalogs. If a user or automated system was tricked into processing a\nspecially crafted XML catalog, an attacker could possibly use this issue to\ncause libxml2 to crash, resulting in a denial of service. (CVE-2026-76781)\n\nIt was discovered that libxml2 incorrectly handled certain large qualified\nnames, leading to a heap-based buffer overflow. An attacker could possibly\nuse this issue to cause libxml2 to crash, resulting in a denial of service,\nor possibly execute arbitrary code. (CVE-2026-86138)\n\nIt was discovered that libxml2 incorrectly handled escaping certain large\nURI strings. An attacker could possibly use this issue to cause libxml2 to\nuse excessive resources, leading to a denial of service. This issue only\naffected Ubuntu 26.04 LTS. (CVE-2026-86139)\n\nXudong Cao and Meng Xu discovered that libxml2 incorrectly handled certain\nlarge XPointer expressions, leading to a heap-based buffer overflow. An\nattacker could possibly use this issue to cause libxml2 to crash, resulting\nin a denial of service, or possibly execute arbitrary code.\n(CVE-2026-86142)\n\nXudong Cao and Meng Xu discovered that libxml2 did not check for integer\noverflows before passing output lengths to write callbacks. An attacker\ncould possibly use this issue to cause an application using libxml2 to\ncrash, resulting in a denial of service. (CVE-2026-86143)\n\nIt was discovered that libxml2 did not apply parser options, such as\ndisabling network access, when processing XInclude directives under certain\ncircumstances. An attacker could possibly use this issue to perform XML\nexternal entity injection or server-side request forgery attacks, or cause\na denial of service. (CVE-2026-86144)","status":"published","published":"2026-10-08T20:05:15Z","modified":"2026-10-09T07:57:36.005248021Z","updated_at":"2026-11-02T16:58:26.907654Z"}]}}