CVE-2026-79298

HIGHPre-NVD 8.48.4—
EchelonGraph scoreHIGH confidence

Score 8.4 from GitHub Security Advisory (severity: HIGH) published 2026-09-16. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 5 sources updated this weekElevated
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 8.4Exploit: Elevated riskExposed: 0

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

An issue in Howyar Technologies Inc SysReturn Versions prior to 11.3.034 and fixed in v.11.3.0.34 allows a local attcker to execute arbitrary code via the BOOTia32.efi and a crafted cloak32.dat file on the ESP.

CVSS v3
8.4
EG Score
8.4(high)
EG Risk
54(Track*)
EG Risk 54/100SSVC: 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
Severity84% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

September 16, 2026

Last Modified

September 17, 2026

Advisory Details (2)

Auto-updated Sep 17, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

GitHub - TheMalwareGuardian/CVE-2026-79298: CVE-2026-79298 - Incomplete remediation of UEFI Secure Boot bypass in Howyar SysReturn. The IA-32 boot path (BOOTia32.efi) was never patched after CVE-2024-7344, shipping the same revoked custom PE loader until July 2026. · GitHub

https://github.com/TheMalwareGuardian/CVE-2026-79298
generic🟡 PoC Available

GitHub - TheMalwareGuardian/UEFI-Security-Research-Howyar-SysReturn-NetCopy: Post CVE-2024-7344 analysis of Howyar SysReturn NetCopy - reverse engineering notes, vulnerable binaries, vendor correspondence, and proof-of-concept tooling for CVE-2026-79298 (IA-32 Secure Boot bypass via the RxPE custom PE loader in BOOTia32.efi). · GitHub

https://github.com/TheMalwareGuardian/UEFI-Security-Research-Howyar-SysReturn-NetCopy

Vendor Advisories for CVE-2026-79298(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 16× in last 7d / 16× 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 20:56 UTCEG score recompute
  2. 2026-09-19 20:56 UTCGHSA enrichment
  3. 2026-09-19 08:13 UTCGHSA enrichment
  4. 2026-09-18 19:30 UTCEG score recompute
  5. 2026-09-18 19:30 UTCGHSA enrichment
  6. 2026-09-18 19:28 UTCEPSS rescore
  7. 2026-09-18 06:44 UTCEG score recompute
  8. 2026-09-18 06:44 UTCGHSA enrichment
  9. 2026-09-17 18:01 UTCEG score recompute
  10. 2026-09-17 18:01 UTCGHSA enrichment
  11. 2026-09-17 15:25 UTCEG score recompute▲ 8.40
  12. 2026-09-17 15:25 UTCGHSA enrichment
  13. 2026-09-17 15:24 UTCMITRE cvelistV5CVSS v3 → 8.4 · severity → HIGH
  14. 2026-09-16 19:24 UTCNVD update
  15. 2026-09-16 18:55 UTCEG score recompute
  16. 2026-09-16 18:54 UTCMITRE cvelistV5first tracked

Publicly available exploits

(2 references)

Working exploit code is in the public domain (2 GitHub PoCs). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCTheMalwareGuardian/CVE-2026-79298
    First seen Sep 11, 2026

    CVE-2026-79298 - Incomplete remediation of UEFI Secure Boot bypass in Howyar SysReturn. The IA-32 boot path (BOOTia32.efi) was never patched after CVE-2024-7344, shipping the same revoked custom PE loader until July 2026.

    Open source ↗
  • GitHub PoCTheMalwareGuardian/UEFI-Security-Research-Howyar-SysReturn-NetCopy
    First seen Jun 15, 2026

    Post CVE-2024-7344 analysis of Howyar SysReturn NetCopy - reverse engineering notes, vulnerable binaries, vendor correspondence, and proof-of-concept tooling for CVE-2026-79298 (IA-32 Secure Boot bypass via the RxPE custom PE loader in BOOTia32.efi).

    Open source ↗

Frequently asked(5)

What is CVE-2026-79298?
CVE-2026-79298 is a high vulnerability published on September 16, 2026. An issue in Howyar Technologies Inc SysReturn Versions prior to 11.3.034 and fixed in v.11.3.0.34 allows a local attcker to execute arbitrary code via the BOOTia32.efi and a crafted cloak32.dat file on the ESP.
When was CVE-2026-79298 disclosed?
CVE-2026-79298 was first published in the National Vulnerability Database on September 16, 2026, with the most recent update on September 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-79298 actively exploited?
CVE-2026-79298 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 90.7% of all scored CVEs.
What is the CVSS score of CVE-2026-79298?
CVE-2026-79298 has a CVSS v3.1 base score of 8.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-79298?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-79298, 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-2026-79298

Explore →

Is Your Infrastructure Affected by CVE-2026-79298?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs