CVE-2026-82018

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH confidence

Score 6.1 from GitHub Security Advisory published 2026-08-29. a secondary CVSS source baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 0

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

IGEL OS 12 before 12.9.0, 12.8.3 LTS and IGEL OS 11 before 11.11.150 contain a secure boot bypass vulnerability in the GRUB boot stage that allows physically present attackers to gain unauthorized root access by placing an unsigned empty file named igel.conf on a partition. Attackers can exploit GRUB's fail-open signature verification behavior to drop into an interactive GRUB prompt, then boot the device's own kernel with additional command-line arguments to obtain a root shell with the disk unlocked while leaving TPM PCR values unaltered.

CVSS v3
6.1
EG Score
6.1(high)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

August 28, 2026

Last Modified

September 2, 2026

Advisory Details (4)

Auto-updated Aug 28, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic

IGEL OS 12 / 11 Secure Boot Bypass via Unsigned igel.conf File | Advisories | VulnCheck

https://www.vulncheck.com/advisories/igel-os-12-11-secure-boot-bypass-via-unsigned-igel-conf-file
generic
https://media.defcon.org/DEF%20CON%2034/DEF%20CON%2034%20presentations/DEF%20CON%2034%20presentations/DEF%20CON%2034%20-%20Darren%20McDonald%20-%20Thin%20Client%20Thin%20Crypto%20-%20Bypassing%20Full-Desk%20Encryption%20Across%20Three%20Major%20Thin%20Clients%20Vendors%20without%20Breaking%20a%20Ci.pdf
generic🔴 Active Exploitation

ISN 2026-20: GRUB Shell Escape in IGEL OS | IGEL Knowledge Base

https://kb.igel.com/en/security-safety/current/isn-2026-20-grub-shell-escape-in-igel-os
generic

Thin Client? Thin Crypto: An overview.

https://blog.amberwolf.com/blog/2026/august/thin-client-thin-crypto-overview/

Vendor Advisories for CVE-2026-82018(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 63× 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. 2026-09-19 06:54 UTCEG score recompute
  2. 2026-09-19 06:54 UTCGHSA enrichment
  3. 2026-09-18 19:28 UTCEPSS rescore
  4. 2026-09-18 08:58 UTCEG score recompute
  5. 2026-09-18 08:58 UTCGHSA enrichment
  6. 2026-09-17 11:01 UTCEG score recompute
  7. 2026-09-17 11:01 UTCGHSA enrichment
  8. 2026-09-16 14:08 UTCEPSS rescore
  9. 2026-09-16 13:04 UTCEG score recompute
  10. 2026-09-16 13:04 UTCGHSA enrichment
  11. 2026-09-16 05:15 UTCEPSS rescore
  12. 2026-09-15 15:07 UTCEG score recompute
  13. 2026-09-15 15:07 UTCGHSA enrichment
  14. 2026-09-15 03:12 UTCEPSS rescore
  15. 2026-09-15 03:12 UTCEPSS rescore
  16. 2026-09-14 17:10 UTCGHSA enrichment
  17. 2026-09-13 19:13 UTCEG score recompute
  18. 2026-09-13 19:13 UTCGHSA enrichment
  19. 2026-09-12 21:16 UTCEG score recompute
  20. 2026-09-12 21:16 UTCGHSA enrichment
  21. 2026-09-11 23:19 UTCEG score recompute
  22. 2026-09-11 23:19 UTCGHSA enrichment
  23. 2026-09-11 14:53 UTCEPSS rescore
  24. 2026-09-11 14:53 UTCEPSS rescore
  25. 2026-09-11 01:14 UTCEG score recompute
Show 38 more
  1. 2026-09-11 01:14 UTCGHSA enrichment
  2. 2026-09-10 03:17 UTCGHSA enrichment
  3. 2026-09-09 05:21 UTCEG score recompute
  4. 2026-09-09 05:20 UTCGHSA enrichment
  5. 2026-09-08 22:01 UTCEPSS rescore
  6. 2026-09-08 07:24 UTCEG score recompute
  7. 2026-09-08 07:24 UTCGHSA enrichment
  8. 2026-09-07 09:28 UTCEG score recompute
  9. 2026-09-07 09:28 UTCGHSA enrichment
  10. 2026-09-06 13:48 UTCEPSS rescore
  11. 2026-09-06 11:26 UTCEG score recompute
  12. 2026-09-06 11:26 UTCGHSA enrichment
  13. 2026-09-05 15:31 UTCEPSS rescore
  14. 2026-09-05 13:29 UTCGHSA enrichment
  15. 2026-09-04 15:29 UTCEG score recompute
  16. 2026-09-04 15:29 UTCGHSA enrichment
  17. 2026-09-04 05:07 UTCEPSS rescore
  18. 2026-09-03 17:31 UTCGHSA enrichment
  19. 2026-09-02 19:33 UTCEG score recompute
  20. 2026-09-02 19:33 UTCGHSA enrichment
  21. 2026-09-02 19:03 UTCEG score recompute
  22. 2026-09-02 19:02 UTCGHSA enrichment
  23. 2026-09-02 12:57 UTCGHSA enrichment
  24. 2026-09-01 14:54 UTCEG score recompute
  25. 2026-09-01 14:54 UTCGHSA enrichment
  26. 2026-09-01 13:54 UTCEPSS rescore
  27. 2026-08-31 16:45 UTCEG score recompute
  28. 2026-08-31 16:45 UTCGHSA enrichment
  29. 2026-08-30 19:18 UTCEPSS rescore
  30. 2026-08-30 19:17 UTCEPSS rescore
  31. 2026-08-30 18:33 UTCEG score recompute
  32. 2026-08-30 18:33 UTCGHSA enrichment
  33. 2026-08-30 01:22 UTCEPSS rescore
  34. 2026-08-29 20:37 UTCEG score recompute
  35. 2026-08-29 20:36 UTCGHSA enrichment
  36. 2026-08-28 22:38 UTCEG score recompute
  37. 2026-08-28 22:01 UTCEG score recompute
  38. 2026-08-28 21:59 UTCMITRE cvelistV5first tracked

Frequently asked(5)

What is CVE-2026-82018?
CVE-2026-82018 is a medium vulnerability published on August 28, 2026. IGEL OS 12 before 12.9.0, 12.8.3 LTS and IGEL OS 11 before 11.11.150 contain a secure boot bypass vulnerability in the GRUB boot stage that allows physically present attackers to gain unauthorized root access by placing an unsigned empty file named igel.conf on a partition. Attackers can exploit…
When was CVE-2026-82018 disclosed?
CVE-2026-82018 was first published in the National Vulnerability Database on August 28, 2026, with the most recent update on September 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82018 actively exploited?
CVE-2026-82018 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 92.7% of all scored CVEs.
What is the CVSS score of CVE-2026-82018?
CVE-2026-82018 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-82018?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82018, 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

Explore the affected products and dependency analysis for CVE-2026-82018

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