{"id":"UBUNTU-CVE-2026-39894","details":"Cacti is an open source performance and fault management framework. In versions 1.2.30 and below, the locale-dependent decimal formatting in rrdtool_function_update() can corrupt RRDtool metric values. The rrdtool_function_update() function checks metric values with is_numeric() and concatenates them into the RRDtool update command via PHP string interpolation. PHP's string cast of floats is locale-sensitive: if LC_NUMERIC uses comma as decimal separator (e.g., de_DE), a value of 1.5 becomes \"1,5\". RRDtool expects . as decimal separator, causing metric data to shift into wrong columns or be silently dropped. No setlocale() reset is present in the update path. This causes a data integrity issue, but is not remotely exploitable; it requires server locale misconfiguration. The issue has been fixed in version 1.2.31.","modified":"2026-06-29T21:20:02Z","published":"2026-06-24T22:16:00Z","upstream":["CVE-2026-39894"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-39894"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-39894"},{"type":"REPORT","url":"https://github.com/Cacti/cacti/security/advisories/GHSA-23g4-vf2j-94w4"},{"type":"REPORT","url":"https://github.com/Cacti/cacti/issues/7011"},{"type":"REPORT","url":"https://github.com/Cacti/cacti/commit/d2a698854956e9e4e53da9eab5b5719ae40e6893"}],"affected":[{"package":{"name":"cacti","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/cacti?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8.8b+dfsg-3","0.8.8b+dfsg-5","0.8.8b+dfsg-5ubuntu0.1","0.8.8b+dfsg-5ubuntu0.2","0.8.8b+dfsg-5ubuntu0.2+esm1","0.8.8b+dfsg-5ubuntu0.2+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"cacti","binary_version":"0.8.8b+dfsg-5ubuntu0.2+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39894.json"}},{"package":{"name":"cacti","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/cacti?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.8.8f+ds1-2","0.8.8f+ds1-3","0.8.8f+ds1-4","0.8.8f+ds1-4ubuntu1","0.8.8f+ds1-4ubuntu2","0.8.8f+ds1-4ubuntu3","0.8.8f+ds1-4ubuntu4","0.8.8f+ds1-4ubuntu4.16.04","0.8.8f+ds1-4ubuntu4.16.04.1","0.8.8f+ds1-4ubuntu4.16.04.2","0.8.8f+ds1-4ubuntu4.16.04.2+esm1","0.8.8f+ds1-4ubuntu4.16.04.2+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"cacti","binary_version":"0.8.8f+ds1-4ubuntu4.16.04.2+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39894.json"}},{"package":{"name":"cacti","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/cacti?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.18+ds1-1","1.1.27+ds1-2","1.1.27+ds1-3","1.1.28+ds1-2","1.1.35+ds1-1","1.1.36+ds1-1","1.1.38+ds1-1","1.1.38+ds1-1ubuntu0.1~esm1","1.1.38+ds1-1ubuntu0.1~esm3","1.1.38+ds1-1ubuntu0.1~esm4"],"ecosystem_specific":{"binaries":[{"binary_version":"1.1.38+ds1-1ubuntu0.1~esm4","binary_name":"cacti"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39894.json"}},{"package":{"name":"cacti","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/cacti?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.4+ds1-2ubuntu3","1.2.9+ds1-1ubuntu1","1.2.9+ds1-1ubuntu2","1.2.10+ds1-1ubuntu1","1.2.10+ds1-1ubuntu1+esm1","1.2.10+ds1-1ubuntu1.1","1.2.10+ds1-1ubuntu1.1+esm1","1.2.10+ds1-1ubuntu1.1+esm2"],"ecosystem_specific":{"binaries":[{"binary_name":"cacti","binary_version":"1.2.10+ds1-1ubuntu1.1+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39894.json"}},{"package":{"name":"cacti","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/cacti?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.16+ds1-2ubuntu1","1.2.19+ds1-2ubuntu1","1.2.19+ds1-2ubuntu1+esm1","1.2.19+ds1-2ubuntu1.1","1.2.19+ds1-2ubuntu1.1+esm1","1.2.19+ds1-2ubuntu1.1+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.2.19+ds1-2ubuntu1.1+esm2","binary_name":"cacti"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39894.json"}},{"package":{"name":"cacti","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/cacti?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.25+ds1-2","1.2.26+ds1-1","1.2.26+ds1-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"cacti","binary_version":"1.2.26+ds1-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39894.json"}},{"package":{"name":"cacti","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/cacti?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.28+ds1-4ubuntu1","1.2.30+ds1-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"cacti","binary_version":"1.2.30+ds1-1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39894.json"}},{"package":{"name":"cacti","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/cacti?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.2.30+ds1-1ubuntu1","1.2.30+ds1-1ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"cacti","binary_version":"1.2.30+ds1-1ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-39894.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}