How severe is CVE-2026-28279?

CVE-2026-28279 has a CVSS score of 7.3/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by CVE-2026-28279?

CVE-2026-28279 affects the following packages: github.com/jmpsec/osctrl (Go). Ecosystems affected: Go.

How do I fix CVE-2026-28279?

Update github.com/jmpsec/osctrl to 0.5.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-28279 is resolved across your whole dependency graph.

How do I detect CVE-2026-28279 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/jmpsec/osctrl, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-28279 if there is no patch (or I can't update yet)?

Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Is CVE-2026-28279 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-28279 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-28279?

CVE-2026-28279 has an EPSS (Exploit Prediction Scoring System) score of 1.0%, placing it in the 62th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-28279?

CVE-2026-28279 is classified as OS Command Injection (CWE-78). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2026-28279 published, and has it been updated?

CVE-2026-28279 was published on February 26, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹

🐹 Go

Not in CISA KEV

HIGH severity

CVE-2026-28279 — osctrl

HIGHFix: jmpsec/osctrl#777

CVE-2026-28279 is a high-severity (CVSS 7.3) OS Command Injection vulnerability in github.com/jmpsec/osctrl. A fix is available for github.com/jmpsec/osctrl — see the affected versions and patch details below.

`osctrl-admin` Vulnerable to OS Command Injection via Environment Configuration

Also known asGHSA-rchw-322g-f7rmGO-2026-4579

Published

Feb 26, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

A successful exploit gives an attacker total control of the affected component, not partial access.
CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-28279.

EPSS Exploitation Probability

via FIRST.org ↗

1.0%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs62th percentile — riskier than 62% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

🐹github.com/jmpsec/osctrl

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

Summary

An OS command injection vulnerability exists in the osctrl-admin environment configuration. An authenticated administrator can inject arbitrary shell commands via the hostname parameter when creating or editing environments. These commands are embedded into enrollment one-liner scripts generated using Go's text/template package (which does not perform shell escaping) and execute on every endpoint that enrolls using the compromised environment.

Impact

An attacker with administrator access can achieve remote code execution on every endpoint that enrolls using the compromised environment. Commands execute as root/SYSTEM (the privilege level used for osquery enrollment) before osquery is installed, leaving no agent-level audit trail. This enables backdoor installation, credential exfiltration, and full endpoint compromise.

Patches

Fixed in osctrl v0.5.0. Users should upgrade immediately.

Workarounds

Restrict osctrl administrator access to trusted personnel. Review existing environment configurations for suspicious hostnames. Monitor enrollment scripts for unexpected commands.

Credits

Leon Johnson and Kwangyun Keum from TikTok USDS JV Offensive Security Operations (Offensive Privacy Team)

https://github.com/Kwangyun → @Kwangyun https://github.com/sho-luv → @sho-luv

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/jmpsec/osctrl`	all versions	0.5.0`go get github.com/jmpsec/osctrl@v0.5.0`

Affected Products

1 product · 1 configurations

Application

osctrljmpsec

< 0.5.0

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/jmpsec/osctrl, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/jmpsec/osctrl to 0.5.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-28279 is resolved across your whole dependency graph.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.

Frequently Asked Questions

### Summary An OS command injection vulnerability exists in the `osctrl-admin` environment configuration. An authenticated administrator can inject arbitrary shell commands via the hostname parameter when creating or editing environments. These commands are embedded into enrollment one-liner scripts generated using Go's `text/template` package (which does not perform shell escaping) and execute on every endpoint that enrolls using the compromised environment. ### Impact An attacker with administrator access can achieve remote code execution on every endpoint that enrolls using the compromised