{"id":"CVE-2026-65610","aliases":["DEBIAN-CVE-2026-65610","EUVD-2026-62399","GHSA-2fq9-p2vj-rc2v","UBUNTU-CVE-2026-65610"],"status":"published","title":"Numeric Truncation Error in nnn","description":"nnn stores homelen variable as uchar_t, which can only represent values in the range 0-255. An attacker who can influence the victim's execution environment can provide an arbitrary HOME path with length that is truncated to 0. The expression (homelen - 1) is promoted to signed int and becomes -1 and producing an out-of-bounds read and an out-of-bounds write one byte before the path buffer. \n\n\n\n\nMaintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.","severity":{"version":"4.0","score":2.4,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00165,"percentile":0.05713,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-197"],"published":"2026-08-19T13:21:13Z","modified":"2026-10-29T02:30:41Z","affected":[{"source":"osv","ecosystem":"Debian:12","package":"nnn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.7-1","4.8-1","4.9-1","5.0-1","5.1-1","5.2-1","5.3-1"]},{"source":"osv","ecosystem":"Debian:13","package":"nnn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0-1","5.1-1","5.2-1","5.3-1"]},{"source":"osv","ecosystem":"Debian:14","package":"nnn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0-1","5.1-1","5.2-1","5.3-1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"nnn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3-2","1.5-1","1.6-1","1.7-1"]},{"source":"osv","ecosystem":"Ubuntu:20.04:LTS","package":"nnn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6-1","2.7-1","2.8-1","2.8.1-1","2.9-1","3.0-1","3.0-2"]},{"source":"osv","ecosystem":"Ubuntu:22.04:LTS","package":"nnn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.5-1","4.3-1"]},{"source":"osv","ecosystem":"Ubuntu:24.04:LTS","package":"nnn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8-1","4.9-1","4.9-1build1","4.9-1build2"]},{"source":"osv","ecosystem":"Ubuntu:26.10","package":"nnn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.1-1","5.2-1","5.3-1"]},{"source":"osv","ecosystem":"Ubuntu:26.04:LTS","package":"nnn","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0-1","5.1-1"]}],"products":[{"vendor":"jarun","product":"nnn"},{"vendor":"nnn","product":"nnn"}],"references":[{"url":"https://cert.pl/en/posts/2026/08/CVE-2026-65609","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-65610","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-2fq9-p2vj-rc2v"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/65xxx/CVE-2026-65610.json","tags":["advisory"]},{"url":"https://github.com/jarun/nnn","tags":["package"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-65610","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-65610","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-65610","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-65610","title":"Numeric Truncation Error in nnn","description":"nnn stores homelen variable as uchar_t, which can only represent values in the range 0-255. An attacker who can influence the victim's execution environment can provide an arbitrary HOME path with length that is truncated to 0. The expression (homelen - 1) is promoted to signed int and becomes -1 and producing an out-of-bounds read and an out-of-bounds write one byte before the path buffer. \n\n\n\n\nMaintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.","status":"published","published":"2026-08-19T13:21:13.455Z","modified":"2026-08-20T15:57:11.971Z","cvss":[{"version":"4.0","score":2.4,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low","assessor":"cna"}],"cwes":["CWE-197"],"updated_at":"2026-11-02T13:37:13.934727Z"}],"euvd":[{"id":"EUVD-2026-62399","description":"nnn stores homelen variable as uchar_t, which can only represent values in the range 0-255. An attacker who can influence the victim's execution environment can provide an arbitrary HOME path with length that is truncated to 0. The expression (homelen - 1) is promoted to signed int and becomes -1 and producing an out-of-bounds read and an out-of-bounds write one byte before the path buffer. \n\n\n\n\nMaintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.","status":"published","published":"2026-08-19T13:21:13Z","modified":"2026-08-20T15:57:11Z","cvss":[{"version":"4.0","score":2.4,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-02T18:01:39.722145Z"}],"ghsa":[{"id":"GHSA-2fq9-p2vj-rc2v","title":"nnn stores homelen variable as uchar_t, which can only represent values in the range 0-255. An...","description":"nnn stores homelen variable as uchar_t, which can only represent values in the range 0-255. An attacker who can influence the victim's execution environment can provide an arbitrary HOME path with length that is truncated to 0. The expression (homelen - 1) is promoted to signed int and becomes -1 and producing an out-of-bounds read and an out-of-bounds write one byte before the path buffer. \n\n\n\n\nMaintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.","status":"published","published":"2026-08-19T15:32:26Z","modified":"2026-08-19T15:32:34Z","cvss":[{"version":"4.0","score":2.4,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"}],"cwes":["CWE-197"],"updated_at":"2026-11-02T15:10:39.892418Z"}],"nvd":[{"id":"CVE-2026-65610","description":"nnn stores homelen variable as uchar_t, which can only represent values in the range 0-255. An attacker who can influence the victim's execution environment can provide an arbitrary HOME path with length that is truncated to 0. The expression (homelen - 1) is promoted to signed int and becomes -1 and producing an out-of-bounds read and an out-of-bounds write one byte before the path buffer. \n\n\n\n\nMaintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.","status":"published","published":"2026-08-19T14:17:38.227Z","modified":"2026-10-27T12:10:00.343Z","cvss":[{"version":"4.0","score":2.4,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"}],"cwes":["CWE-197"],"updated_at":"2026-11-02T14:12:39.620837Z"}],"osv":[{"id":"CVE-2026-65610","title":"Numeric Truncation Error in nnn","description":"nnn stores homelen variable as uchar_t, which can only represent values in the range 0-255. An attacker who can influence the victim's execution environment can provide an arbitrary HOME path with length that is truncated to 0. The expression (homelen - 1) is promoted to signed int and becomes -1 and producing an out-of-bounds read and an out-of-bounds write one byte before the path buffer. \n\n\n\n\nMaintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.","status":"published","published":"2026-08-19T13:21:13.455Z","modified":"2026-10-29T02:30:41.252765185Z","cvss":[{"version":"4.0","score":2.4,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low"}],"cwes":["CWE-197"],"updated_at":"2026-11-02T15:45:14.096824Z"},{"id":"DEBIAN-CVE-2026-65610","description":"nnn stores homelen variable as uchar_t, which can only represent values in the range 0-255. An attacker who can influence the victim's execution environment can provide an arbitrary HOME path with length that is truncated to 0. The expression (homelen - 1) is promoted to signed int and becomes -1 and producing an out-of-bounds read and an out-of-bounds write one byte before the path buffer.      Maintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.","status":"published","published":"2026-08-19T14:17:38.227Z","modified":"2026-10-28T09:47:38.463492271Z","cvss":[{"version":"4.0","score":2.4,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"}],"updated_at":"2026-11-02T15:45:58.699079Z"},{"id":"UBUNTU-CVE-2026-65610","description":"nnn stores homelen variable as uchar_t, which can only represent values in the range 0-255. An attacker who can influence the victim's execution environment can provide an arbitrary HOME path with length that is truncated to 0. The expression (homelen - 1) is promoted to signed int and becomes -1 and producing an out-of-bounds read and an out-of-bounds write one byte before the path buffer. Maintainer of this project was notified about this vulnerability. It might has been addressed, but the maintainer did not provide a vulnerable version range. Only version 5.2 was tested and confirmed as vulnerable.","status":"published","published":"2026-08-19T14:17:00Z","modified":"2026-10-17T12:59:16.810045802Z","cvss":[{"version":"4.0","score":2.4,"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","level":"low"}],"updated_at":"2026-11-02T16:56:53.710209Z"}]}}