{"id":"CVE-2026-115506","aliases":["ALPINE-CVE-2026-115506","AZL-110546","AZL-111014","BELL-CVE-2026-115506","DEBIAN-CVE-2026-115506","EUVD-2026-108338","GHSA-j83x-34mv-v962","ROOT-OS-DEBIAN-12-CVE-2026-115506","ROOT-OS-DEBIAN-13-CVE-2026-115506","UBUNTU-CVE-2026-115506","openSUSE-SU-2026:12396-1"],"status":"published","title":"libexpat through 2.9.0 Denial of Service via Billion Laughs Detection Delay","description":"libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.","severity":{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/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":0.00448,"percentile":0.3943,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-776"],"published":"2026-10-22T19:14:06Z","modified":"2026-11-11T07:30:05Z","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 moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.","status":"published","published":"2026-10-22T19:14:06Z","modified":"2026-10-23T21:06:43Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:59:31.865878Z"}],"ghsa":[{"id":"GHSA-j83x-34mv-v962","title":"libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs...","description":"libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. 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Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.","status":"published","published":"2026-10-22T20:17:06.62Z","modified":"2026-11-02T18:27:06.127Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/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":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-776"],"updated_at":"2026-11-02T20:51:42.579129Z"}],"osv":[{"id":"ALPINE-CVE-2026-115506","description":"libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.","status":"published","published":"2026-10-22T20:17:06.62Z","modified":"2026-11-02T14:30:02.456454233Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/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"}],"updated_at":"2026-11-02T15:27:50.269992Z"},{"id":"BELL-CVE-2026-115506","status":"published","published":"2026-10-30T06:08:48.848823Z","modified":"2026-11-11T07:30:05.521539903Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-11T07:56:32.232974Z"},{"id":"CVE-2026-115506","title":"libexpat through 2.9.0 Denial of Service via Billion Laughs Detection Delay","description":"libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.","status":"published","published":"2026-10-22T19:14:06.001Z","modified":"2026-11-04T17:27:19.179854893Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-776"],"updated_at":"2026-11-04T17:42:28.435012Z"},{"id":"DEBIAN-CVE-2026-115506","description":"libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.","status":"published","published":"2026-10-22T20:17:06.62Z","modified":"2026-11-08T10:00:11.050427849Z","cvss":[{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/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"}],"updated_at":"2026-11-08T10:03:28.621517Z"},{"id":"UBUNTU-CVE-2026-115506","description":"libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.","status":"published","published":"2026-10-22T20:17:00Z","modified":"2026-10-28T20:16:00.311148885Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"},{"version":"4.0","score":8.7,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T16:56:00.081948Z"},{"id":"AZL-110546","title":"CVE-2026-115506 affecting package expat 2.9.0-1","description":"libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.","status":"published","published":"2026-10-22T20:17:06Z","modified":"2026-11-05T05:40:51Z","updated_at":"2026-11-05T16:41:18.42484Z"},{"id":"AZL-111014","title":"CVE-2026-115506 affecting package cmake 3.30.3-15","description":"libexpat through 2.9.0 contains a denial of service vulnerability because billion laughs protection in accountingDiffTolerated() in xmlparse.c detects entity amplification too late. Attackers can supply a moderately sized XML document with a large DTD and nested entity expansions to consume tens of seconds of CPU per parse.","status":"published","published":"2026-10-22T20:17:06Z","modified":"2026-10-27T05:36:16Z","updated_at":"2026-11-02T15:28:02.368326Z"},{"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"},{"id":"ROOT-OS-DEBIAN-12-CVE-2026-115506","title":"CVE-2026-115506 in expat - Patched by Root","description":"Root has patched CVE-2026-115506 in the expat package for Root:Debian:12. Multiple fixed versions available.","status":"published","published":"2026-11-02T08:17:33Z","modified":"2026-11-02T09:15:03.243137848Z","updated_at":"2026-11-02T15:53:31.773105Z"},{"id":"ROOT-OS-DEBIAN-13-CVE-2026-115506","title":"CVE-2026-115506 in expat - Patched by Root","description":"Root has patched CVE-2026-115506 in the expat package for Root:Debian:13. Multiple fixed versions available.","status":"published","published":"2026-10-30T09:53:30Z","modified":"2026-10-30T10:15:03.404285597Z","updated_at":"2026-11-02T15:53:33.153539Z"}]}}