CVE-2026-26068

CRITICALNVD 9.99.9—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.9 under NVD CVSS v3. EPSS exploit probability: 0.7%, top 29% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Elevated
9.9
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.9Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

emp3r0r is a stealth-focused C2 designed by Linux users for Linux environments. Prior to 3.21.1, untrusted agent metadata (Transport, Hostname) is accepted during check-in and later interpolated into tmux shell command strings executed via /bin/sh -c. This enables command injection and remote code execution on the operator host. This vulnerability is fixed in 3.21.1.

CVSS v3
9.9
EG Score
9.9(medium)
EPSS
87.0%
KEV
Not listed

Published

February 12, 2026

Last Modified

February 25, 2026

Advisory Details (3)

Auto-updated Jul 12, 2026
🔬 Proof of concept available. Patch available. Sources: github_release, github, github_commit.
github Patch Available🟡 PoC Available

Agent-Controlled Metadata to Operator RCE (tmux Command Injection) · Advisory · jm33-m0/emp3r0r · GitHub

https://github.com/jm33-m0/emp3r0r/security/advisories/GHSA-h5p4-4xp4-vjpp
github_release Patch Available

v3.21.1

Patch available: jm33-m0/emp3r0r v3.21.1

https://github.com/jm33-m0/emp3r0r/releases/tag/v3.21.1
github_commit Patch Available

commit 0cd64e4a26e7 (jm33-m0/emp3r0r)

Patch available: jm33-m0/emp3r0r v3.21.1 (contains commit 0cd64e4a26e7)

https://github.com/jm33-m0/emp3r0r/commit/0cd64e4a26e7839a9a54bca3d756a665fcb7fda0

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 46× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-15 16:57 UTCEPSS rescore
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  25. 2026-06-29 13:02 UTCOSV refresh
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  1. 2026-06-28 04:56 UTCEPSS rescore
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  27. 2026-06-12 03:53 UTCEG score recompute
  28. 2026-06-11 14:00 UTCEPSS rescore
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  31. 2026-06-10 22:03 UTCEG score recompute
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  37. 2026-06-08 06:48 UTCEG score recompute
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  40. 2026-06-07 19:21 UTCEG score recompute
  41. 2026-06-07 15:25 UTCEPSS rescore
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  60. 2026-05-29 13:58 UTCEG score recompute
  61. 2026-05-29 13:44 UTCEPSS rescore
  62. 2026-05-29 13:44 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-26068?
CVE-2026-26068 is a critical vulnerability published on February 12, 2026. emp3r0r is a stealth-focused C2 designed by Linux users for Linux environments. Prior to 3.21.1, untrusted agent metadata (Transport, Hostname) is accepted during check-in and later interpolated into tmux shell command strings executed via /bin/sh -c. This enables command injection and remote code…
When was CVE-2026-26068 disclosed?
CVE-2026-26068 was first published in the National Vulnerability Database on February 12, 2026, with the most recent update on February 25, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-26068 actively exploited?
CVE-2026-26068 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 87.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-26068?
CVE-2026-26068 has a CVSS v3 base score of 9.9 (NVD).
How do I remediate CVE-2026-26068?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-26068, 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.

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