{"id":"CVE-2017-9526","aliases":["BELL-CVE-2017-9526","DEBIAN-CVE-2017-9526","DSA-3880-1","EUVD-2017-18457","GHSA-665h-28h9-qh6v","SUSE-SU-2017:1608-1","UBUNTU-CVE-2017-9526","USN-3347-1"],"status":"published","title":"In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel...","description":"In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.","severity":{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-07","score":0.02318,"percentile":0.83542,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-200"],"published":"2017-06-10T00:00:00Z","modified":"2026-10-24T10:30:35Z","fixes":[{"ecosystem":"Debian:12","package":"libgcrypt20","fixed_in":["1.7.6-2"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"libgcrypt20","fixed_in":["1.7.6-2"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"libgcrypt20","fixed_in":["1.7.6-2"],"sources":["osv"]},{"ecosystem":"Debian:8","package":"libgcrypt20","fixed_in":["1.6.3-2+deb8u3"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise Desktop 12 SP2","package":"libgcrypt","fixed_in":["1.6.1-16.39.1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise Server for Raspberry Pi 12 SP2","package":"libgcrypt","fixed_in":["1.6.1-16.39.1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise Software Development Kit 12 SP2","package":"libgcrypt","fixed_in":["1.6.1-16.39.1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise Server 12 SP2","package":"libgcrypt","fixed_in":["1.6.1-16.39.1"],"sources":["osv"]},{"ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP2","package":"libgcrypt","fixed_in":["1.6.1-16.39.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"libgcrypt20","fixed_in":["1.6.5-2ubuntu0.3"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"libgcrypt20","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.6-2"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"libgcrypt20","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.6-2"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"libgcrypt20","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.7.6-2"}]}]},{"source":"osv","ecosystem":"Debian:8","package":"libgcrypt20","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.3-2+deb8u3"}]}],"versions":["1.6.3-2","1.6.3-2+deb8u1","1.6.3-2+deb8u2"]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Desktop 12 SP2","package":"libgcrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.1-16.39.1"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for Raspberry Pi 12 SP2","package":"libgcrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.1-16.39.1"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Software Development Kit 12 SP2","package":"libgcrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.1-16.39.1"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server 12 SP2","package":"libgcrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.1-16.39.1"}]}]},{"source":"osv","ecosystem":"SUSE:Linux Enterprise Server for SAP Applications 12 SP2","package":"libgcrypt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.1-16.39.1"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"libgcrypt20","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.5-2ubuntu0.3"}]}],"versions":["1.6.3-2ubuntu1","1.6.4-3","1.6.4-4","1.6.4-5","1.6.5-2","1.6.5-2ubuntu0.2"]},{"source":"osv","ecosystem":"Ubuntu:14.04:LTS","package":"libgcrypt11","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.5.3-2ubuntu4.5"}]}],"versions":["1.5.0-3ubuntu3","1.5.3-2ubuntu1","1.5.3-2ubuntu4","1.5.3-2ubuntu4.1","1.5.3-2ubuntu4.2","1.5.3-2ubuntu4.3","1.5.3-2ubuntu4.4"],"bundled":2},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"libgcrypt20","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.5-2ubuntu0.3"}]}],"versions":["1.6.3-2ubuntu1","1.6.4-3","1.6.4-4","1.6.4-5","1.6.5-2","1.6.5-2ubuntu0.2"],"bundled":2}],"products":[{"vendor":"gnupg","product":"libgcrypt"}],"references":[{"url":"http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html","tags":["x_refsource_CONFIRM","x_transferred","advisory"]},{"url":"https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html","tags":["x_refsource_CONFIRM","x_transferred","advisory"]},{"url":"https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=5a22de904a0a366ae79f03ff1e13a1232a89e26b","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"http://www.debian.org/security/2017/dsa-3880","tags":["vendor-advisory","x_refsource_DEBIAN","x_transferred","advisory"]},{"url":"http://www.securityfocus.com/bid/99046","tags":["vdb-entry","x_refsource_BID","x_transferred","Third Party Advisory","VDB Entry","advisory"]},{"url":"https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=f9494b3f258e01b6af8bd3941ce436bcc00afc56","tags":["x_refsource_CONFIRM","x_transferred","web"]},{"url":"https://bugzilla.suse.com/show_bug.cgi?id=1042326","tags":["x_refsource_CONFIRM","x_transferred","Issue Tracking","Patch","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2017-9526"},{"url":"https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=5a22de904a0a366ae79f03ff1e13a1232a89e26b"},{"url":"https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git;a=commit;h=f9494b3f258e01b6af8bd3941ce436bcc00afc56"},{"url":"https://github.com/advisories/GHSA-665h-28h9-qh6v"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2017-9526","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2017-9526","tags":["advisory"]},{"url":"https://www.suse.com/support/update/announcement/2017/suse-su-20171608-1/","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1042326","tags":["report"]},{"url":"https://bugzilla.suse.com/931932","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2017-9526","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2017-9526","tags":["report"]},{"url":"https://ubuntu.com/security/notices/USN-3347-1","tags":["advisory"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2017-9526","tags":["report"]},{"url":"https://ubuntu.com/security/CVE-2017-7526","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2017-9526","description":"In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.","status":"published","published":"2017-06-11T02:00:00Z","modified":"2024-08-05T17:11:02.257Z","updated_at":"2026-11-02T14:33:13.96587Z"}],"euvd":[{"id":"EUVD-2017-18457","description":"In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.","status":"published","published":"2017-06-11T02:00:00Z","modified":"2024-08-05T17:11:02Z","updated_at":"2026-11-03T02:23:27.678389Z"}],"ghsa":[{"id":"GHSA-665h-28h9-qh6v","title":"In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel...","description":"In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.","status":"published","published":"2022-05-14T01:40:19Z","modified":"2025-04-20T03:39:51Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T15:01:47.903342Z"}],"nvd":[{"id":"CVE-2017-9526","description":"In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.","status":"published","published":"2017-06-11T02:29:00.183Z","modified":"2026-06-17T01:28:18.247Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"primary"},{"version":"2.0","score":4.3,"vector":"AV:N/AC:M/Au:N/C:P/I:N/A:N","level":"medium","assessor":"primary"}],"cwes":["CWE-200"],"updated_at":"2026-11-02T14:03:50.782497Z"}],"osv":[{"id":"BELL-CVE-2017-9526","title":"CVE-2017-9526 does not affect BellSoft software","status":"withdrawn","published":"2017-06-11T02:29:00Z","modified":"2026-09-04T07:15:05.251721274Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:28:14.701973Z"},{"id":"CVE-2017-9526","description":"In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.","status":"published","published":"2017-06-11T02:29:00.183Z","modified":"2026-10-24T10:30:35.44426631Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:44:07.192756Z"},{"id":"DEBIAN-CVE-2017-9526","description":"In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.","status":"published","published":"2017-06-11T02:29:00.183Z","modified":"2026-09-01T20:03:52.00408619Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:29.698576Z"},{"id":"UBUNTU-CVE-2017-9526","description":"In Libgcrypt before 1.7.7, an attacker who learns the EdDSA session key (from side-channel observation during the signing process) can easily recover the long-term secret key. 1.7.7 makes a cipher/ecc-eddsa.c change to store this session key in secure memory, to ensure that constant-time point operations are used in the MPI library.","status":"published","published":"2017-06-10T00:00:00Z","modified":"2026-04-22T11:37:44.534728Z","cvss":[{"version":"3.0","score":5.9,"vector":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:16.154988Z"},{"id":"DSA-3880-1","title":"libgcrypt20 - security update","status":"published","published":"2017-06-14T00:00:00Z","modified":"2026-03-09T01:23:15.396851Z","updated_at":"2026-11-02T15:46:16.523846Z"},{"id":"SUSE-SU-2017:1608-1","title":"Security update for libgcrypt","description":"This update for libgcrypt fixes the following issues:\n\n- CVE-2017-9526: Store the session key in secure memory to ensure that constant\n  time point operations are used in the MPI library.  (bsc#1042326)\n\n- Don't require secure memory for the fips selftests, this prevents the\n  'Oops, secure memory pool already initialized' warning. (bsc#931932)\n","status":"published","published":"2017-06-19T12:57:55Z","modified":"2026-02-04T03:36:54.024093Z","updated_at":"2026-11-02T15:53:43.83457Z"},{"id":"USN-3347-1","title":"libgcrypt11, libgcrypt20 vulnerabilities","description":"Daniel J. Bernstein, Joachim Breitner, Daniel Genkin, Leon Groot\nBruinderink, Nadia Heninger, Tanja Lange, Christine van Vredendaal, and\nYuval Yarom discovered that Libgcrypt was susceptible to an attack via\nside channels. A local attacker could use this attack to recover RSA\nprivate keys. (CVE-2017-7526)\n\nIt was discovered that Libgcrypt was susceptible to an attack via\nside channels. A local attacker could use this attack to possibly recover\nEdDSA private keys. This issue only applied to Ubuntu 16.04 LTS, Ubuntu\n16.10 and Ubuntu 17.04. (CVE-2017-9526)\n","status":"published","published":"2017-07-03T18:40:30Z","modified":"2026-04-22T09:36:39.344267Z","updated_at":"2026-11-02T16:58:13.496563Z"}]}}