{"id":"CVE-2026-35537","aliases":["DEBIAN-CVE-2026-35537","EUVD-2026-18575","GHSA-rxj3-rrwm-pj4r","UBUNTU-CVE-2026-35537","openSUSE-SU-2026:20586-1"],"status":"published","title":"Roundcube Webmail: Unsafe deserialization in the redis/memcache session handler","description":"An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsafe deserialization in the redis/memcache session handler may lead to arbitrary file write operations by unauthenticated attackers via crafted session data.","severity":{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00482,"percentile":0.41862,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-502"],"published":"2026-04-03T03:28:29Z","modified":"2026-10-28T02:31:06Z","fixes":[{"ecosystem":"Packagist","package":"roundcube/roundcubemail","fixed_in":["1.7-rc5"],"sources":["ghsa","osv"]},{"ecosystem":"Debian:12","package":"roundcube","fixed_in":["1.6.5+dfsg-1+deb12u8"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"roundcube","fixed_in":["1.6.15+dfsg-0+deb13u1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"roundcube","fixed_in":["1.6.14+dfsg-1"],"sources":["osv"]},{"ecosystem":"openSUSE:Leap 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16.0","package":"roundcubemail","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.6.15-bp160.1.1"}]}]}],"products":[{"vendor":"bulwarkmail","product":"webmail"},{"vendor":"roundcube","product":"webmail"}],"references":[{"url":"https://roundcube.net/news/2026/03/18/security-updates-1.7-rc5-1.6.14-1.5.14","tags":["Third Party Advisory","web","report"]},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.7-rc5","tags":["Release Notes","web","report"]},{"url":"https://github.com/roundcube/roundcubemail/commit/6d586cfa4d8a31f7957f7a445aaedd52592a0e74","tags":["Patch","fix","web","report"]},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.6.14","tags":["Release Notes","web","report"]},{"url":"https://github.com/roundcube/roundcubemail/commit/a4ead994d2f0ea92e4a1603196a197e0d5df1620","tags":["Patch","fix","web","report"]},{"url":"https://github.com/roundcube/roundcubemail/releases/tag/1.5.14","tags":["Release Notes","web","report"]},{"url":"https://github.com/roundcube/roundcubemail/commit/618c5428edc69fb088e7ac6c89e506dd39df3","tags":["Patch","fix","web","report"]},{"url":"http://www.openwall.com/lists/oss-security/2026/04/11/6","tags":["Issue Tracking","Mailing List","web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-35537","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-rxj3-rrwm-pj4r"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/35xxx/CVE-2026-35537.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-35537","tags":["advisory"]},{"url":"https://github.com/roundcube/roundcubemail","tags":["package"]},{"url":"https://ubuntu.com/security/CVE-2026-35537","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-35537","tags":["report"]},{"url":"","tags":["advisory"]},{"url":"https://bugzilla.suse.com/1261157","tags":["report"]},{"url":"https://bugzilla.suse.com/1261488","tags":["report"]},{"url":"https://www.suse.com/security/cve/CVE-2026-35537","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2026-35537","description":"An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsafe deserialization in the redis/memcache session handler may lead to arbitrary file write operations by unauthenticated attackers via crafted session data.","status":"published","published":"2026-04-03T03:28:29.321Z","modified":"2026-04-11T14:12:39.387Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:20:05.505362Z"}],"euvd":[{"id":"EUVD-2026-18575","description":"An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsafe deserialization in the redis/memcache session handler may lead to arbitrary file write operations by unauthenticated attackers via crafted session data.","status":"published","published":"2026-04-03T03:28:29Z","modified":"2026-04-11T14:12:39Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T19:24:29.371024Z"}],"ghsa":[{"id":"GHSA-rxj3-rrwm-pj4r","title":"Roundcube Webmail: Unsafe deserialization in the redis/memcache session handler","description":"An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsafe deserialization in the redis/memcache session handler may lead to arbitrary file write operations by unauthenticated attackers via crafted session data.","status":"published","published":"2026-04-03T06:31:32Z","modified":"2026-04-14T21:55:57Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:39:54.128054Z"}],"nvd":[{"id":"CVE-2026-35537","description":"An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsafe deserialization in the redis/memcache session handler may lead to arbitrary file write operations by unauthenticated attackers via crafted session data.","status":"published","published":"2026-04-03T04:17:10.313Z","modified":"2026-07-24T21:10:00.143Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low","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:H/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T14:12:12.73929Z"}],"osv":[{"id":"CVE-2026-35537","description":"An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsafe deserialization in the redis/memcache session handler may lead to arbitrary file write operations by unauthenticated attackers via crafted session data.","status":"published","published":"2026-04-03T03:28:29.321Z","modified":"2026-10-28T02:31:06.874900105Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:45:02.673625Z"},{"id":"DEBIAN-CVE-2026-35537","description":"An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsafe deserialization in the redis/memcache session handler may lead to arbitrary file write operations by unauthenticated attackers via crafted session data.","status":"published","published":"2026-04-03T04:17:10.313Z","modified":"2026-10-01T03:03:22.353530689Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T15:45:54.587575Z"},{"id":"GHSA-rxj3-rrwm-pj4r","title":"Roundcube Webmail: Unsafe deserialization in the redis/memcache session handler","description":"An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsafe deserialization in the redis/memcache session handler may lead to arbitrary file write operations by unauthenticated attackers via crafted session data.","status":"published","published":"2026-04-03T06:31:32Z","modified":"2026-04-14T22:20:49.698656Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"cwes":["CWE-502"],"updated_at":"2026-11-02T15:46:56.639206Z"},{"id":"UBUNTU-CVE-2026-35537","description":"An issue was discovered in Roundcube Webmail before 1.5.14 and 1.6.14. Unsafe deserialization in the redis/memcache session handler may lead to arbitrary file write operations by unauthenticated attackers via crafted session data.","status":"published","published":"2026-04-03T04:17:00Z","modified":"2026-10-17T12:58:51.380499577Z","cvss":[{"version":"3.1","score":3.7,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","level":"low"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","level":"high"}],"updated_at":"2026-11-02T16:56:16.686388Z"},{"id":"openSUSE-SU-2026:20586-1","title":"Security update for roundcubemail","description":"This update for roundcubemail fixes the following issues:\n\nChanges in roundcubemail:\n\n- update to 1.6.15\n  This is a security update to the stable version 1.6 of Roundcube Webmail.\n  It provides fixes to some regressions introduced in the previous release\n  as well a recently reported security vulnerability:\n\n    SVG Animate FUNCIRI Attribute Bypass — Remote Image Loading via fill/filter/stroke, reported by class_nzm.\n\n  This version is considered stable and we recommend to update all productive\n  installations of Roundcube 1.6.x with it. Please do backup your data before updating!\n\n  + Fix regression where mail search would fail on non-ascii search criteria (#10121)\n  + Fix regression where some data url images could get ignored/lost (#10128)\n  + Fix SVG Animate FUNCIRI Attribute Bypass — Remote Image Loading via fill/filter/stroke (bsc#1261157)\n\n- update to 1.6.14\n  This is a security update to the stable version 1.6 of Roundcube Webmail.\n  + Fix Postgres connection using IPv6 address (#10104)\n  + Security: Fix pre-auth arbitrary file write via unsafe deserialization in redis/memcache session handler\n    (bsc#1261488, CVE-2026-35537)\n  + Security: Fix bug where a password could get changed without providing the old password\n  + Security: Fix IMAP Injection + CSRF bypass in mail search\n  + Security: Fix remote image blocking bypass via various SVG animate attributes\n  + Security: Fix remote image blocking bypass via a crafted body background attribute\n  + Security: Fix fixed position mitigation bypass via use of !important\n  + Security: Fix XSS issue in a HTML attachment preview\n  + Security: Fix SSRF + Information Disclosure via stylesheet links to a local network hosts\n","status":"published","published":"2026-04-17T09:15:58Z","modified":"2026-04-22T18:27:20.626228Z","updated_at":"2026-11-02T16:58:41.463445Z"}]}}