CVE-2026-21516

HIGHNVD 8.88.8—Trending — 4 sources updated this week

8.8

Improper neutralization of special elements used in a command ('command injection') in Github Copilot allows an unauthorized attacker to execute code over a network.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 9.2%
KEV: Not listed

Published

February 10, 2026

Last Modified

February 11, 2026

References (1)

secure@microsofthttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-21516

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-77Command Injection

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Microsoft MSRCCVE-2026-215162026-02-10
GitHub Copilot for Jetbrains Remote Code Execution Vulnerability

Frequently asked(5)

What is CVE-2026-21516?

CVE-2026-21516 is a high vulnerability published on February 10, 2026. Improper neutralization of special elements used in a command ('command injection') in Github Copilot allows an unauthorized attacker to execute code over a network.

When was CVE-2026-21516 disclosed?

CVE-2026-21516 was first published in the National Vulnerability Database on February 10, 2026, with the most recent update on February 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2026-21516 actively exploited?

CVE-2026-21516 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 9.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2026-21516?

CVE-2026-21516 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2026-21516?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21516, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2026-21516

Published

Last Modified

References (1)

Weakness Classification(1)

All Vendor Advisories

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-21516?

Same vendor

Same CWE

CVE-2026-21516

📅 Published

🔄 Last Modified

🔗 References (1)

Weakness Classification(1)

All Vendor Advisories

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2026-21516?

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References (1)

Frequently asked(5)

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