{"id":"CVE-2026-39817","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-39817","generatedAt":"2026-10-28T04:36:24.809Z","title":"Extracting a malicious archive file with the \"pack\" subcommand can write files to arbitrary locations on the filesystem.","description":"The \"go tool pack\" subcommand (usually used only by the compiler as an internal tool with known-good inputs) does not sanitize output filenames. Extracting a malicious archive file with the \"pack\" subcommand can write files to arbitrary locations on the filesystem.","published":"2026-05-07T20:16:43.000Z","lastModified":"2026-06-17T10:42:38.000Z","status":"Analyzed","sourceIdentifier":"security@golang.org","cvss":{"version":"3.1","score":5.9,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N"},"cwe":["CWE-787"],"affected":["golang/go"],"epss":{"score":0.0017,"percentile":0.06342,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.17%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://go.dev/cl/767520","tags":["Patch"],"source":"security@golang.org"},{"url":"https://go.dev/issue/78778","tags":["Issue Tracking"],"source":"security@golang.org"},{"url":"https://groups.google.com/g/golang-announce/c/qcCIEXso47M","tags":["Issue Tracking","Mailing List"],"source":"security@golang.org"},{"url":"https://pkg.go.dev/vuln/GO-2026-4979","tags":["Vendor Advisory"],"source":"security@golang.org"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-39817","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}