{"id":"GHSA-hfvc-g4fc-pqhx","summary":"opentelemetry-go: BSD kenv command not using absolute path enables PATH hijacking","details":"## Summary\n\nThe fix for GHSA-9h8m-3fm2-qjrq (CVE-2026-24051) changed the Darwin `ioreg` command to use an absolute path but left the BSD `kenv` command using a bare name, allowing the same PATH hijacking attack on BSD and Solaris platforms.\n\n## Root Cause\n\n`sdk/resource/host_id.go` line 42:\n\n    if result, err := r.execCommand(\"kenv\", \"-q\", \"smbios.system.uuid\"); err == nil {\n\nCompare with the fixed Darwin path at line 58:\n\n    result, err := r.execCommand(\"/usr/sbin/ioreg\", \"-rd1\", \"-c\", \"IOPlatformExpertDevice\")\n\nThe `execCommand` helper at `sdk/resource/host_id_exec.go` uses `exec.Command(name, arg...)` which searches `$PATH` when the command name contains no path separator.\n\nAffected platforms (per build tag in `host_id_bsd.go:4`): DragonFly BSD, FreeBSD, NetBSD, OpenBSD, Solaris.\n\nThe `kenv` path is reached when `/etc/hostid` does not exist (line 38-40), which is common on FreeBSD systems.\n\n## Attack\n\n1. Attacker has local access to a system running a Go application that imports `go.opentelemetry.io/otel/sdk`\n2. Attacker places a malicious `kenv` binary earlier in `$PATH`\n3. Application initializes OpenTelemetry resource detection at startup\n4. `hostIDReaderBSD.read()` calls `exec.Command(\"kenv\", ...)` which resolves to the malicious binary\n5. Arbitrary code executes in the context of the application\n\nSame attack vector and impact as CVE-2026-24051.\n\n## Suggested Fix\n\nUse the absolute path:\n\n    if result, err := r.execCommand(\"/bin/kenv\", \"-q\", \"smbios.system.uuid\"); err == nil {\n\nOn FreeBSD, `kenv` is located at `/bin/kenv`.","aliases":["CVE-2026-39883"],"modified":"2026-04-09T14:48:40.875909Z","published":"2026-04-08T19:22:12Z","related":["CGA-vpw6-rgj5-prpf"],"database_specific":{"nvd_published_at":"2026-04-08T21:17:00Z","github_reviewed":true,"severity":"HIGH","cwe_ids":["CWE-426"],"github_reviewed_at":"2026-04-08T19:22:12Z"},"references":[{"type":"WEB","url":"https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-hfvc-g4fc-pqhx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39883"},{"type":"PACKAGE","url":"https://github.com/open-telemetry/opentelemetry-go"},{"type":"WEB","url":"http://github.com/open-telemetry/opentelemetry-go/releases/tag/v1.43.0"}],"affected":[{"package":{"name":"go.opentelemetry.io/otel/sdk","ecosystem":"Go","purl":"pkg:golang/go.opentelemetry.io/otel/sdk"},"ranges":[{"type":"SEMVER","events":[{"introduced":"1.15.0"},{"fixed":"1.43.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-hfvc-g4fc-pqhx/GHSA-hfvc-g4fc-pqhx.json","last_known_affected_version_range":"\u003c= 1.42.0"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}]}