{"id":"CVE-2003-1564","aliases":["EUVD-2003-1554","GHSA-6wfm-7hqx-39wg","RHSA-2008:0886"],"status":"published","title":"libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which...","description":"libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, aka the \"billion laughs attack.\"","severity":{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.01619,"percentile":0.76205,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-776"],"published":"2003-12-31T05:00:00Z","modified":"2026-06-26T10:09:54Z","affected":[{"source":"osv","ecosystem":"Red Hat:enterprise_linux:2.1::as","package":"libxml2","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:2.4.19-11.ent"}]}],"bundled":2},{"source":"osv","ecosystem":"Red Hat:enterprise_linux:2.1::as","package":"libxml2-devel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:2.4.19-11.ent"}]}],"bundled":2},{"source":"osv","ecosystem":"Red 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List","Patch"]},{"url":"http://www.redhat.com/support/errata/RHSA-2008-0886.html","tags":["vendor-advisory","x_refsource_REDHAT","x_transferred","Broken Link"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2003-1564","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-6wfm-7hqx-39wg"},{"url":"https://access.redhat.com/errata/RHSA-2008:0886","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#important","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=461015","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=461107","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2008/rhsa-2008_0886.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2003-1564","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2003-1564","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2008-3529","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2008-3529","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2008-3529","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2003-1564","description":"libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, aka the \"billion laughs attack.\"","status":"published","published":"2008-09-02T14:00:00Z","modified":"2024-08-08T02:35:17Z","updated_at":"2026-11-02T14:20:16.072351Z"}],"euvd":[{"id":"EUVD-2003-1554","description":"libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, aka the \"billion laughs attack.\"","status":"published","published":"2008-09-02T14:00:00Z","modified":"2024-08-08T02:35:17Z","updated_at":"2026-11-03T01:15:01.993523Z"}],"ghsa":[{"id":"GHSA-6wfm-7hqx-39wg","title":"libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which...","description":"libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, aka the \"billion laughs attack.\"","status":"published","published":"2022-04-29T01:28:19Z","modified":"2024-02-02T15:32:01Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-776"],"updated_at":"2026-11-02T14:55:31.84746Z"}],"nvd":[{"id":"CVE-2003-1564","description":"libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, aka the \"billion laughs attack.\"","status":"published","published":"2003-12-31T05:00:00Z","modified":"2026-06-16T22:04:39.947Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"},{"version":"2.0","score":9.3,"vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-776"],"updated_at":"2026-11-02T14:00:48.212104Z"}],"osv":[{"id":"RHSA-2008:0886","title":"Red Hat Security Advisory: libxml2 security update","status":"published","published":"2024-09-15T17:31:13Z","modified":"2026-06-26T10:09:54Z","updated_at":"2026-11-02T15:53:00.468834Z"}]}}