{"id":"CVE-2015-6835","aliases":["BELL-CVE-2015-6835","DSA-3358-1","EUVD-2015-6771","GHSA-5qpr-hcf2-vwc2","MGASA-2015-0365","RHSA-2016:0457","SUSE-SU-2015:1633-1","UBUNTU-CVE-2015-6835","USN-2758-1"],"status":"published","title":"The session deserializer in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13...","description":"The session deserializer in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 mishandles multiple php_var_unserialize calls, which allow remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via crafted session content.","severity":{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.36163,"percentile":0.98485,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":true},"published":"2015-09-09T00:00:00Z","modified":"2026-06-29T10:11:57Z","exploits":[{"source":"exploitdb","id":"EDB-38123","title":"PHP Session Deserializer - Use-After-Free","type":"dos","platform":"php","date":"2015-09-09","verified":true,"url":"https://www.exploit-db.com/exploits/38123"},{"source":"pocgithub","id":"ockeghem/CVE-2015-6835-checker","title":"ockeghem/CVE-2015-6835-checker","date":"2015-12-19","url":"https://github.com/ockeghem/CVE-2015-6835-checker"}],"fixes":[{"ecosystem":"Ubuntu:14.04:LTS","package":"php5","fixed_in":["5.5.9+dfsg-1ubuntu4.13"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:7","package":"php5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.4.45-0+deb7u1"}]}],"versions":["5.4.11-1","5.4.15-1","5.4.34-0+deb7u1","5.4.35-0+deb7u1","5.4.35-0+deb7u2","5.4.36-0+deb7u1","5.4.36-0+deb7u3","5.4.38-0+deb7u1","5.4.39-0+deb7u1","5.4.39-0+deb7u2","5.4.4-14","5.4.4-14+deb7u1","5.4.4-14+deb7u10","5.4.4-14+deb7u11","5.4.4-14+deb7u12","5.4.4-14+deb7u13","5.4.4-14+deb7u14","5.4.4-14+deb7u2","5.4.4-14+deb7u3","5.4.4-14+deb7u4","5.4.4-14+deb7u5","5.4.4-14+deb7u7","5.4.4-14+deb7u8","5.4.4-14+deb7u9","5.4.4-15","5.4.4-15.1","5.4.41-0+deb7u1","5.4.44-0+deb7u1","5.4.6-1","5.4.6-2","5.4.8-1","5.4.9-1","5.4.9-2","5.4.9-3","5.4.9-4"],"bundled":5},{"source":"osv","ecosystem":"Debian:8","package":"php5","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.6.13+dfsg-0+deb8u1"}]}],"versions":["5.6.11+dfsg-1","5.6.12+dfsg-0+deb8u1","5.6.12+dfsg-1","5.6.7+dfsg-1","5.6.9+dfsg-0+deb8u1","5.6.9+dfsg-1"],"bundled":5},{"source":"osv","ecosystem":"Mageia:4","package":"php","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.5.29-1.mga4"}]}],"bundled":5},{"source":"osv","ecosystem":"Mageia:4","package":"php-apc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.1.15-4.19.mga4"}]}],"bundled":5},{"source":"osv","ecosystem":"Red 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]},{"url":"https://www.cve.org/CVERecord?id=CVE-2015-6834","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2015-6834","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2015-6835","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2015-6835","tags":["advisory","report"]},{"url":"https://access.redhat.com/security/cve/CVE-2015-6836","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2015-6836","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2015-6836","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2015-6837","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2015-6837","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2015-6837","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2015-6838","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2015-6838","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2015-6838","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2015-7803","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2015-7803","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2015-7803","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2015-7804","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2015-7804","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2015-7804","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2015/suse-su-20151633-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/935074","tags":["report"]},{"url":"https://bugzilla.suse.com/942291","tags":["report"]},{"url":"https://bugzilla.suse.com/942293","tags":["report"]},{"url":"https://bugzilla.suse.com/942294","tags":["report"]},{"url":"https://bugzilla.suse.com/942295","tags":["report"]},{"url":"https://bugzilla.suse.com/942296","tags":["report"]},{"url":"https://bugzilla.suse.com/944302","tags":["report"]},{"url":"https://bugzilla.suse.com/945402","tags":["report"]},{"url":"https://bugzilla.suse.com/945403","tags":["report"]},{"url":"https://bugzilla.suse.com/945412","tags":["report"]},{"url":"https://bugzilla.suse.com/945428","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2015-6831","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-6832","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-6833","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-6834","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-6835","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-6836","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-6837","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2015-6838","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2015-6835","tags":["report"]},{"url":"http://www.openwall.com/lists/oss-security/2015/09/07/5","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-2758-1","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2015-5589","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-5590","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-6831","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-6832","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-6833","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-6834","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-6836","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-6837","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2015-6838","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2015-6835","description":"The session deserializer in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 mishandles multiple php_var_unserialize calls, which allow remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via crafted session content.","status":"published","published":"2016-05-16T10:00:00Z","modified":"2024-08-06T07:36:33.384Z","updated_at":"2026-11-02T14:35:42.984856Z"}],"euvd":[{"id":"EUVD-2015-6771","description":"The session deserializer in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 mishandles multiple php_var_unserialize calls, which allow remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via crafted session content.","status":"published","published":"2016-05-16T10:00:00Z","modified":"2024-08-06T07:36:33Z","updated_at":"2026-11-03T02:21:54.34629Z"}],"ghsa":[{"id":"GHSA-5qpr-hcf2-vwc2","title":"The session deserializer in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13...","description":"The session deserializer in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 mishandles multiple php_var_unserialize calls, which allow remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via crafted session content.","status":"published","published":"2022-05-17T00:28:14Z","modified":"2023-02-03T05:01:42Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T14:53:01.625617Z"}],"nvd":[{"id":"CVE-2015-6835","description":"The session deserializer in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 mishandles multiple php_var_unserialize calls, which allow remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via crafted session content.","status":"published","published":"2016-05-16T10:59:19.58Z","modified":"2026-06-17T00:31:30.29Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":7.5,"vector":"AV:N/AC:L/Au:N/C:P/I:P/A:P","level":"high","assessor":"primary"}],"updated_at":"2026-11-02T14:03:16.97467Z"}],"osv":[{"id":"BELL-CVE-2015-6835","title":"CVE-2015-6835 does not affect BellSoft software","status":"withdrawn","published":"2016-05-16T10:59:00Z","modified":"2026-01-26T09:45:50.44761Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:28:13.47097Z"},{"id":"UBUNTU-CVE-2015-6835","description":"The session deserializer in PHP before 5.4.45, 5.5.x before 5.5.29, and 5.6.x before 5.6.13 mishandles multiple php_var_unserialize calls, which allow remote attackers to execute arbitrary code or cause a denial of service (use-after-free) via crafted session content.","status":"published","published":"2015-09-09T00:00:00Z","modified":"2026-04-22T10:17:14.194341Z","cvss":[{"version":"3.0","score":9.8,"vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:54:10.737723Z"},{"id":"DSA-3358-1","title":"php5 - security update","status":"published","published":"2015-09-13T00:00:00Z","modified":"2026-03-09T01:22:48.05648Z","updated_at":"2026-11-02T15:46:16.199525Z"},{"id":"MGASA-2015-0365","title":"Updated php packages fix security vulnerabilities","description":"Updated php packages fix security vulnerabilities:\n\nThe php package has been updated to version 5.5.29, which fixes several\nsecurity issues and other bugs.  See the upstream ChangeLog for more details.\n","status":"published","published":"2015-09-13T21:58:30Z","modified":"2026-04-16T06:26:10.957211964Z","updated_at":"2026-11-02T15:49:39.792687Z"},{"id":"RHSA-2016:0457","title":"Red Hat Security Advisory: rh-php56-php security update","status":"published","published":"2024-09-13T09:47:33Z","modified":"2026-06-29T10:11:57Z","updated_at":"2026-11-02T15:53:03.734507Z"},{"id":"SUSE-SU-2015:1633-1","title":"Security update for php5","description":"\nThis update of PHP5 brings several security fixes.\n\nSecurity fixes:\n* CVE-2015-6831: A use after free vulnerability in unserialize() has been fixed which could be used to crash php or potentially execute code. [bnc#942291] [bnc#942294] [bnc#942295]\n* CVE-2015-6832: A dangling pointer in the unserialization of ArrayObject items could be used to crash php or potentially execute code. [bnc#942293]\n* CVE-2015-6833: A directory traversal when extracting ZIP files could be used to overwrite files outside of intended area. [bnc#942296]\n* CVE-2015-6834: A Use After Free Vulnerability in unserialize() has been fixed which could be used to crash php or potentially execute code. [bnc#945403] \n* CVE-2015-6835: A Use After Free Vulnerability in session unserialize() has been fixed which could be used to crash php or potentially execute code. [bnc#945402]\n* CVE-2015-6836: A SOAP serialize_function_call() type confusion leading to remote code execution problem was fixed. [bnc#945428]\n* CVE-2015-6837 CVE-2015-6838: Two NULL pointer dereferences in the XSLTProcessor class were fixed. [bnc#945412]\n\nBugfixes:\n* Compare with SQL_NULL_DATA correctly [bnc#935074]\n* If MD5 was disabled in net-snmp we have to disable the used MD5\n  function in ext/snmp/snmp.c as well. (bsc#944302)\n\nAlso the Suhosin framework was updated to 0.9.38. [fate#319325]\n","status":"published","published":"2015-09-17T07:51:44Z","modified":"2026-02-04T03:33:12.235872Z","updated_at":"2026-11-02T15:53:43.030986Z"},{"id":"USN-2758-1","title":"php5 vulnerabilities","description":"It was discovered that the PHP phar extension incorrectly handled certain\nfiles. A remote attacker could use this issue to cause PHP to crash,\nresulting in a denial of service. (CVE-2015-5589)\n\nIt was discovered that the PHP phar extension incorrectly handled certain\nfilepaths. A remote attacker could use this issue to cause PHP to crash,\nresulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2015-5590)\n\nTaoguang Chen discovered that PHP incorrectly handled unserializing\nobjects. A remote attacker could use this issue to cause PHP to crash,\nresulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2015-6831, CVE-2015-6834, CVE-2015-6835\n\nSean Heelan discovered that PHP incorrectly handled unserializing\nobjects. A remote attacker could use this issue to cause PHP to crash,\nresulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2015-6832)\n\nIt was discovered that the PHP phar extension incorrectly handled certain\narchives. A remote attacker could use this issue to cause files to be\nplaced outside of the destination directory. (CVE-2015-6833)\n\nAndrea Palazzo discovered that the PHP Soap client incorrectly validated\ndata types. A remote attacker could use this issue to cause PHP to crash,\nresulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2015-6836)\n\nIt was discovered that the PHP XSLTProcessor class incorrectly handled\ncertain data. A remote attacker could use this issue to cause PHP to crash,\nresulting in a denial of service. (CVE-2015-6837)\n","status":"published","published":"2015-09-30T20:10:18Z","modified":"2026-04-22T09:17:50.218704Z","updated_at":"2026-11-02T16:58:09.227524Z"}]}}