CVE-2026-39883

ADVISORY - github

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

Attacker has local access to a system running a Go application that imports go.opentelemetry.io/otel/sdk
Attacker places a malicious kenv binary earlier in $PATH
Application initializes OpenTelemetry resource detection at startup
hostIDReaderBSD.read() calls exec.Command("kenv", ...) which resolves to the malicious binary
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.

EPSS Score⁠: 0.00236 (0.148)

Common Weakness Enumeration (CWE)

ADVISORY - nist

CWE-426⁠

Untrusted Search Path

ADVISORY - github

CWE-426⁠

Untrusted Search Path

Impacted images

Advisories

GitHub

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY IDGHSA-hfvc-g4fc-pqhx⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)

CWE-426⁠

CVSS SCORE

7.3high

Package	Type	OS Name	OS Version	Affected Ranges	Fix Versions
go.opentelemetry.io/otel/sdk	golang	-	-	>=1.15.0,<=1.42.0	1.43.0

CVSS:4 Severity and metrics

The CVSS metrics represent different qualitative aspects of a vulnerability that impact the overall score, as defined by the CVSS Specification⁠.

The vulnerable component is not bound to the network stack and the attacker's path is via read/write/execute capabilities. Either: The attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or remotely (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).

A successful attack depends on conditions beyond the attacker's control, requiring investing a measurable amount of effort in research, preparation, or execution against the vulnerable component before a successful attack.

The successful attack does not depend on the deployment and execution conditions of the vulnerable system. The attacker can expect to be able to reach the vulnerability and execute the exploit under all or most instances of the vulnerability.

The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.

The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges.

There is a total loss of confidentiality, resulting in all information within the Vulnerable System being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.

There is no loss of confidentiality within the Subsequent System or all confidentiality impact is constrained to the Vulnerable System.

There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the Vulnerable System. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the Vulnerable System.

There is no loss of integrity within the Subsequent System or all integrity impact is constrained to the Vulnerable System.

There is a total loss of availability, resulting in the attacker being able to fully deny access to resources in the Vulnerable System; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the Vulnerable System (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

There is no impact to availability within the Subsequent System or all availability impact is constrained to the Vulnerable System.

NIST

CREATED

4 months ago

UPDATED

2 days ago

ADVISORY IDCVE-2026-39883⁠

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)

CWE-426⁠

CVSS SCORE

7.3high

Debian

2 days ago

ADVISORY ID

CGA-vpw6-rgj5-prpf

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

Photon

CREATED

CREATED

4 months ago

UPDATED

4 months ago

ADVISORY ID

MINI-xw87-mw8w-q5jw

EXPLOITABILITY SCORE

EXPLOITS FOUND

COMMON WEAKNESS ENUMERATION (CWE)-

RATING UNAVAILABLE FROM ADVISORY

CVE-2026-39883

Summary

Summary

Root Cause

Attack

Suggested Fix

Common Weakness Enumeration (CWE)

CWE-426⁠

CWE-426⁠

Advisories

GitHub

CVSS SCORE

Attack Vector (AV)Local

Attack Complexity (AC)High

Attack Requirements (AT)None

Privileges Required (PR)Low

User Interaction (UI)None

Confidentiality Impact to the Vulnerable System (VC)High

Confidentiality Impact to the Subsequent System (SC)None

Integrity Impact to the Vulnerable System (VI)High

Integrity Impact to the Subsequent System (SI)None

Vulnerable System Availability Impact (VA)High

Subsequent System Availability Impact (SA)None

NIST

CVSS SCORE

Debian

CVSS SCORE

Ubuntu

CVSS SCORE

GoLang

Chainguard

Photon

CVSS SCORE

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