{"schema_version":"1.3.1","id":"GO-2026-4978","modified":"2026-05-07T19:21:40Z","published":"2026-05-07T19:21:40Z","aliases":["CVE-2026-39819"],"summary":"Invoking \"go bug\" follows symlinks in predictable temporary filenames in cmd/go","details":"The \"go bug\" command writes to two files with predictable names in the system temporary directory (for example, \"/tmp\").\n\nAn attacker with access to the temporary directory can create a symlink in one of these names, causing \"go bug\" to overwrite the target of the symlink.","affected":[{"package":{"name":"toolchain","ecosystem":"Go"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.25.10"},{"introduced":"1.26.0-0"},{"fixed":"1.26.3"}]}],"ecosystem_specific":{"imports":[{"path":"cmd/go"}]}}],"references":[{"type":"REPORT","url":"https://go.dev/issue/78584"},{"type":"FIX","url":"https://go.dev/cl/763882"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/qcCIEXso47M"}],"credits":[{"name":"Harshit Gupta (Mr HAX)"}],"database_specific":{"url":"https://pkg.go.dev/vuln/GO-2026-4978","review_status":"REVIEWED"}}