{"id":"CVE-2026-118370","aliases":["ALPINE-CVE-2026-118370","AZL-111148","AZL-111851","BELL-CVE-2026-118370","DEBIAN-CVE-2026-118370","EUVD-2026-111546","GHSA-c6pw-vjr4-wwwr","UBUNTU-CVE-2026-118370","openSUSE-SU-2026:12396-1"],"status":"published","title":"libexpat through 2.9.0 Integer Overflow in storeAtts via attIndex and nPrefixes","description":"libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c that allows attackers to trigger out-of-bounds writes via oversized attribute counts. Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.","severity":{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00391,"percentile":0.33722,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-190"],"published":"2026-10-28T02:03:19Z","modified":"2026-11-11T07:30:02Z","fixes":[{"ecosystem":"Alpine:v3.21","package":"expat","fixed_in":["2.10.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"expat","fixed_in":["2.10.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"expat","fixed_in":["2.10.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.24","package":"expat","fixed_in":["2.10.0-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:23","package":"expat","fixed_in":["2.10.0-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:25","package":"expat","fixed_in":["2.10.0-r0"],"sources":["osv"]},{"ecosystem":"Alpaquita:stream","package":"expat","fixed_in":["2.10.0-r0"],"sources":["osv"]},{"ecosystem":"BellSoft 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Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.","status":"published","published":"2026-10-28T02:03:19Z","modified":"2026-11-02T19:56:23Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-03T05:08:37.390802Z"}],"ghsa":[{"id":"GHSA-c6pw-vjr4-wwwr","title":"libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib...","description":"libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c that allows attackers to trigger out-of-bounds writes via oversized attribute counts. 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Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.","status":"published","published":"2026-10-28T03:17:13.293Z","modified":"2026-11-02T20:17:37.377Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"},{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high","assessor":"primary"}],"cwes":["CWE-190"],"updated_at":"2026-11-03T00:02:37.938656Z"}],"osv":[{"id":"ALPINE-CVE-2026-118370","description":"libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c that allows attackers to trigger out-of-bounds writes via oversized attribute counts. Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.","status":"published","published":"2026-10-28T03:17:13.293Z","modified":"2026-11-03T09:30:02.922304121Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high"}],"updated_at":"2026-11-03T09:56:52.729801Z"},{"id":"BELL-CVE-2026-118370","status":"published","published":"2026-10-30T06:08:49.284094Z","modified":"2026-11-11T07:30:02.438218625Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high"}],"updated_at":"2026-11-11T07:56:35.017539Z"},{"id":"CVE-2026-118370","title":"libexpat through 2.9.0 Integer Overflow in storeAtts via attIndex and nPrefixes","description":"libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c that allows attackers to trigger out-of-bounds writes via oversized attribute counts. Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.","status":"published","published":"2026-10-28T02:03:19.447Z","modified":"2026-11-04T17:27:17.965906496Z","cvss":[{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-190"],"updated_at":"2026-11-04T17:42:33.044563Z"},{"id":"DEBIAN-CVE-2026-118370","description":"libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c that allows attackers to trigger out-of-bounds writes via oversized attribute counts. Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.","status":"published","published":"2026-10-28T03:17:13.293Z","modified":"2026-11-08T10:00:15.188878046Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high"}],"updated_at":"2026-11-08T10:03:28.621517Z"},{"id":"UBUNTU-CVE-2026-118370","description":"libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c that allows attackers to trigger out-of-bounds writes via oversized attribute counts. Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.","status":"published","published":"2026-10-28T03:17:00Z","modified":"2026-11-04T03:30:26.470167242Z","cvss":[{"version":"3.1","score":5.9,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"},{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H","level":"high"},{"version":"4.0","score":8.2,"vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-04T03:56:39.110241Z"},{"id":"AZL-111148","title":"CVE-2026-118370 affecting package expat 2.9.0-1","description":"libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c that allows attackers to trigger out-of-bounds writes via oversized attribute counts. Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.","status":"published","published":"2026-10-28T03:17:13Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:18.705965Z"},{"id":"AZL-111851","title":"CVE-2026-118370 affecting package cmake 3.30.3-15","description":"libexpat through 2.9.0 contains a signed integer overflow vulnerability in storeAtts() in lib/xmlparse.c that allows attackers to trigger out-of-bounds writes via oversized attribute counts. Attackers can supply a multi-gigabyte document with a start tag carrying over 2^30 attributes to overflow attIndex and nPrefixes, crashing applications or corrupting heap memory.","status":"published","published":"2026-10-28T03:17:13Z","modified":"2026-11-03T05:33:06Z","updated_at":"2026-11-05T16:41:18.705965Z"},{"id":"openSUSE-SU-2026:12396-1","title":"expat-2.10.0-1.1 on GA media","description":"These are all security issues fixed in the expat-2.10.0-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-11-03T00:00:00Z","modified":"2026-11-04T17:23:23.723138977Z","updated_at":"2026-11-04T17:43:22.558805Z"}]}}