CVE-2026-39883

opentelemetry-go · Vulnerability

CVSS 4.0 7.3 HIGHEUVD CVSS 4.0 7.3 CVSS 4.0 · [email protected] · Secondary 7.3 HIGHCVSS 3.1 · [email protected] · Primary 7.0 HIGHCVSS 3.1 · 134c704f-9b21-4f2e-91b3-4a467353bcc0 · Secondary 7.0 HIGHCVSS 3.1 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c · Secondary 8.8 HIGHCVSS_V4 Publisher rating HIGHFixed by go.opentelemetry.io/otel/sdk 1.43.0osv · severity unknownFixed by go.opentelemetry.io/otel/sdk 1.43.0KEV status unknown

Original advisory

cve-program · CVE-2026-39883

Published

OpenTelemetry-Go is the Go implementation of OpenTelemetry. From 1.15.0 to 1.42.0, the fix for 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. This vulnerability is fixed in 1.43.0.

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euvd · EUVD-2026-20630

Published

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nvd · CVE-2026-39883

Published

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osv · GHSA-hfvc-g4fc-pqhx

Published

## Summary The 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. ## Root Cause `sdk/resource/host_id.go` line 42: if result, err := r.execCommand("kenv", "-q", "smbios.system.uuid"); err == nil { Compare with the fixed Darwin path at line 58: result, err := r.execCommand("/usr/sbin/ioreg", "-rd1", "-c", "IOPlatformExpertDevice") The `execCommand` helper at `sdk/resource/host_id_exec.go` uses `exec.Command(name, arg...)` which searches `$PATH` when the command name contains no path separator. Affected platforms (per build tag in `host_id_bsd.go:4`): DragonFly BSD, FreeBSD, NetBSD, OpenBSD, Solaris. The `kenv` path is reached when `/etc/hostid` does not exist (line 38-40), which is common on FreeBSD systems. ## Attack 1. Attacker has local access to a system running a Go application that imports `go.opentelemetry.io/otel/sdk` 2. Attacker places a malicious `kenv` binary earlier in `$PATH` 3. Application initializes OpenTelemetry resource detection at startup 4. `hostIDReaderBSD.read()` calls `exec.Command("kenv", ...)` which resolves to the malicious binary 5. Arbitrary code executes in the context of the application Same attack vector and impact as CVE-2026-24051. ## Suggested Fix Use the absolute path: if result, err := r.execCommand("/bin/kenv", "-q", "smbios.system.uuid"); err == nil { On FreeBSD, `kenv` is located at `/bin/kenv`.

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osv · GO-2026-5426

Published

Opentelemetry-go: BSD kenv command not using absolute path enables PATH hijacking in go.opentelemetry.io/otel/sdk

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Affected versions, risk and source history

Exploitation and risk

Source status

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Risk history

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Advisory history

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15 Nov 2026 21:53:03 UTC